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  • 51.
    Asplund, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics.
    Ludwig, HG
    Nordlund, A
    Stein, RF
    The effects of numerical resolution on hydrodynamical surface convection simulations and spectral line formation2000In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 359, no 2, p. 669-681Article in journal (Refereed)
    Abstract [en]

    The computationally demanding nature of radiative-hydrodynamical simulations of stellar surface convection warrants an investigation of the sensitivity of the convective structure and spectral synthesis to the numerical resolution and dimension of the sim

  • 52.
    Asplund, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics.
    Nordlund, A
    Trampedach, R
    Prieto, CA
    Stein, RF
    Line formation in solar granulation - I. Fe line shapes, shifts and asymmetries2000In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 359, no 2, p. 729-742Article in journal (Refereed)
    Abstract [en]

    Realistic ab-initio 3D, radiative-hydrodynamical convection simulations of the solar granulation have been applied to Fe I and Fe II line formation. In contrast to classical analyses based on hydrostatic ID model atmospheres the procedure contains no adju

  • 53.
    Asplund, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics.
    Perez, AEG
    On OH line formation and oxygen abundances in metal-poor stars2001In: ASTRONOMY & ASTROPHYSICS, ISSN 1432-0746, Vol. 372, no 2, p. 601-615Article in journal (Refereed)
    Abstract [en]

    The formation of the UV OH spectral lines has been investigated for a range of stellar parameters in the light of 3D hydrodynamical model atmospheres. The low atmospheric temperatures encountered at low metallicities compared with the radiative equilibriu

  • 54.
    Asplund, Martin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Theoretical Astrophysics.
    Effects of Convection on Line Profiles and Abundances2001In: ASPCArticle in journal (Other (popular scientific, debate etc.))
  • 55.
    Asplund, Martin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Theoretical Astrophysics.
    O/Fe in metal-poor main sequence and subgiant stars2002In: A&A, Vol. 07Article in journal (Refereed)
  • 56.
    Asplund, Martin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Theoretical Astrophysics.
    Signatures of Convection in teh Spectrum of Procyon: Fundamental Parametrs and Iron Abundance2002In: ApJ, Vol. 03Article in journal (Refereed)
  • 57.
    Asplund, Martin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Theoretical Astrophysics.
    Sulphur abundances in disk stars: Acorrelation with silicon2002In: A&A, Vol. 07Article in journal (Refereed)
  • 58.
    Asplund, Martin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Theoretical Astrophysics.
    The Star Too Tough to Die2001In: S&T, Vol. 11Article in journal (Refereed)
  • 59.
    Asplund, Martin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Theoretical Astrophysics.
    V838 Monocerotis-a Newly Discovered, Very Peculiar, Slow Nova-Like Objekt2002In: ASPCArticle in journal (Refereed)
  • 60.
    Asplund, Martin
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Faculty of Science and Technology, Astronomical observatory. Department of Physics and Astronomy, Theoretical Astrophysics.
    Collet, Remo
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Faculty of Science and Technology, Astronomical observatory. Department of Physics and Astronomy, Theoretical Astrophysics.
    Radiative Transfer in 3D Model Stellar Atmospheres2003In: ASP Conference Proceedings: 3D Stellar Evolution, 2003, p. 197-Conference paper (Other (popular scientific, debate etc.))
    Abstract [en]

    Recently 3D hydrodynamical simulations of stellar surface convection have become feasible thanks to advances in computer technology and efficient numerical algorithms. Available observational diagnostics indicate that these models are highly realistic in describing the topology of stellar granulation and for spectral line formation purposes. The traditional free parameters (mixing length parameters, micro- and macroturbulence) always inherent in standard 1D analyses have thus finally become obsolete. These 3D models can therefore both shed light on the elusive nature of stellar convection as well as be employed in element abundance analyses. In the present contribution we will describe some aspects of the models and possible applications of them in terms of radiative transfer.

  • 61.
    Asplund, Martin
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Theoretical Astrophysics.
    Lambert, D,L.
    Nissen, P.E.
    Primas, F.
    Smith, V.V.
    Lithium isotope ratios in metal-poor halo stars2001Conference paper (Other (popular scientific, debate etc.))
  • 62.
    Asplund, Martin
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Ryde, Nils
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory. Physics, Department of Astronomy and Space Physics.
    A non-LTE investigation of carbon in R Coronae Borealis stars1996In: Hydrogen deficient stars, 1996, p. 57-Conference paper (Refereed)
  • 63.
    Backrud, M., Wahlund, J., Andre, M., Balogh, A., Buckert, S., Cornilleau, N., Vaivads, A.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics.
    Widespread Eletrostatic ion Cyclotron/ion Acoustic Turbulence Above Auroral Acceleration Region, CLUSTER Observations2003In: American Geophysical Union, Fall Meeting 2003, 2003Conference paper (Other scientific)
  • 64.
    Backrud, Marie
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics.
    Cluster Observations and Theoretical Explanations of Broadband Waves in the Auroral Region2005Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Broadband extremely low-frequency wave emissions below the ion plasma frequency have been observed by a number of spacecraft and rockets on auroral field lines. The importance of these broadband emissions for transverse ion heating and electron acceleration in the auroral regions is now reasonably well established. However, the exact mechanism(s) for mediating this energy transfer and the wave mode(s) involved are not well known. In this thesis we focus on the identification of broadband waves by different methods.

    Two wave analysis methods, involving different approximations and assumptions, give consistent results concerning the wave mode identification. We find that much of the broadband emissions can be identified as a mixture of ion acoustic, electrostatic ion cyclotron and, ion Bernstein waves, which all can be described as different parts of the same dispersion surface in the linear theory of waves in homogeneous plasma.

    A new result is that ion acoustic waves occur on auroral magnetic field lines. These are found in relatively small regions interpreted as acceleration regions without cold (tens of eV) electrons.

    From interferometry we also determine the phase velocity and k vector for parallel and oblique ion acoustic waves. The retrieved characteristic phase velocity is of the order of the ion acoustic speed and larger than the thermal velocity of the protons. The typical wavelength is around the proton gyro radius and always larger than the Debye length which is consistent with ion acoustic waves.

    We have observed quasi-static parallel electric fields associated with the ion acoustic waves in regions with large-scale currents. Waves, in particular ion acoustic waves, can create an anomalous resistivity due to wave-particle interaction when electrons are retarded or trapped by the electric wave-field. To maintain the large-scale current, a parallel electric field is set up, which then can accelerate a second electron population to high velocities.

    List of papers
    1. Identification of Broadband Waves Above the Auroral Acceleration Region: CLUSTER Observations
    Open this publication in new window or tab >>Identification of Broadband Waves Above the Auroral Acceleration Region: CLUSTER Observations
    Show others...
    2004 In: Annales Geophysicae, ISSN 0992-7689, Vol. 22, no 12, p. 14-Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-93091 (URN)
    Available from: 2005-05-11 Created: 2005-05-11 Last updated: 2014-11-12Bibliographically approved
    2. Cluster observations and theoretical identification of broadband waves in the auroral region
    Open this publication in new window or tab >>Cluster observations and theoretical identification of broadband waves in the auroral region
    Show others...
    2005 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 23, no 12, p. 3739-3752Article in journal (Refereed) Published
    Abstract [en]

    Broadband waves are common on auroral field lines. We use two different methods to study the polarization of the waves at 10 to 180 Hz observed by the Cluster spacecraft at altitudes of about 4 Earth radii in the nightside auroral region. Observations of electric and magnetic wave fields, together with electron and ion data, are used as input to the methods. We find that much of the wave emissions are consistent with linear waves in homogeneous plasma. Observed waves with a large electric field perpendicular to the geomagnetic field are more common (electrostatic ion cyclotron waves), while ion acoustic waves with a large parallel electric field appear in smaller regions without suprathermal (tens of eV) plasma. The regions void of suprathermal plasma are interpreted as parallel potential drops of a few hundred volts.

    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-93092 (URN)10.5194/angeo-23-3739-2005 (DOI)000235008400015 ()
    Available from: 2005-05-11 Created: 2005-05-11 Last updated: 2017-12-14Bibliographically approved
    3. Interferometric Identification of Ion Acoustic Broadband Waves in the Auroral Region: CLUSTER Observations
    Open this publication in new window or tab >>Interferometric Identification of Ion Acoustic Broadband Waves in the Auroral Region: CLUSTER Observations
    Show others...
    2005 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 32, no 21Article in journal (Refereed) Published
    Abstract [en]

    [1] We determine the phase velocity and k vector for parallel and oblique broadband extremely low frequency, ELF, waves on nightside auroral magnetic field lines at altitudes around 4.6 RE. We use internal burst mode data from the EFW electric field and wave instrument onboard the Cluster spacecraft to retrieve phase differences between the four probes of the instrument. The retrieved characteristic phase velocity is of the order of the ion acoustic speed and larger than the thermal velocity of the protons. The typical wavelength obtained from interferometry is around the proton gyro radius and always larger than the Debye length. We find that in regions with essentially no suprathermal electrons above a few tens of eV the observed broadband waves above the proton gyro frequency are consistent with upgoing ion acoustic and oblique ion acoustic waves.

    National Category
    Natural Sciences
    Identifiers
    urn:nbn:se:uu:diva-93093 (URN)10.1029/2005GL022640 (DOI)
    Available from: 2005-05-11 Created: 2005-05-11 Last updated: 2017-12-14Bibliographically approved
    4. Direct Observations of Electric Fields and Particle Acceleration Caused by Anomalous Wave-Particle Resistivity in Space Plasmas
    Open this publication in new window or tab >>Direct Observations of Electric Fields and Particle Acceleration Caused by Anomalous Wave-Particle Resistivity in Space Plasmas
    Show others...
    Manuscript (Other academic)
    Identifiers
    urn:nbn:se:uu:diva-93094 (URN)
    Available from: 2005-05-11 Created: 2005-05-11 Last updated: 2010-01-13Bibliographically approved
    Download full text (pdf)
    FULLTEXT01
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    COVER01
  • 65.
    Backrud, Marie
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
    André, Mats
    Balogh, André
    Buchert, Stephan
    Cornilleau-Wehrlin, Nicole
    Vaivads, Andris
    Identification of Broadband Waves Above the Auroral Acceleration Region: CLUSTER Observations2004In: Annales Geophysicae, ISSN 0992-7689, Vol. 22, no 12, p. 14-Article in journal (Refereed)
  • 66.
    Backrud, Marie
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Space and Plasma Physics.
    André, Mats
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Space and Plasma Physics.
    Wahlund, Jan-Erik
    Balogh, A.
    Buchert, Stephan
    Cornilleau-Wehrlin, Nicolle
    Vaivads, Andris
    Identification of broad-band waves above the auroral acceleration region: Cluster observations2004In: Ann. Geophys., Vol. 22, p. 4203-4216Article in journal (Refereed)
  • 67.
    Backrud, Marie
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
    Tjulin, Anders
    Vaivads, Andris
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    André, Mats
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
    Fazakerley, Andrew
    Interferometric Identification of Ion Acoustic Broadband Waves in the Auroral Region: CLUSTER Observations2005In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 32, no 21Article in journal (Refereed)
    Abstract [en]

    [1] We determine the phase velocity and k vector for parallel and oblique broadband extremely low frequency, ELF, waves on nightside auroral magnetic field lines at altitudes around 4.6 RE. We use internal burst mode data from the EFW electric field and wave instrument onboard the Cluster spacecraft to retrieve phase differences between the four probes of the instrument. The retrieved characteristic phase velocity is of the order of the ion acoustic speed and larger than the thermal velocity of the protons. The typical wavelength obtained from interferometry is around the proton gyro radius and always larger than the Debye length. We find that in regions with essentially no suprathermal electrons above a few tens of eV the observed broadband waves above the proton gyro frequency are consistent with upgoing ion acoustic and oblique ion acoustic waves.

  • 68.
    Backrud, Marie
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics.
    Vaivads, Andris
    Wahlund, Jan-Erik
    Eriksson, Anders
    Buchert, Stephan
    Fazakerley, Andrew
    Direct Observations of Electric Fields and Particle Acceleration Caused by Anomalous Wave-Particle Resistivity in Space PlasmasManuscript (Other academic)
  • 69.
    Backrud-Ivgren, Marie
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
    Stenberg, Gabriella
    André, Mats
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Morooka, Michiko
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Hobara, Yasuhide
    Joko, Sachiko
    Rönnmark, Kjell
    Cornilleau-Wehrlin, Nicole
    Fazakerley, Andrew
    Rème, Henri
    Cluster observations and theoretical identification of broadband waves in the auroral region2005In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 23, no 12, p. 3739-3752Article in journal (Refereed)
    Abstract [en]

    Broadband waves are common on auroral field lines. We use two different methods to study the polarization of the waves at 10 to 180 Hz observed by the Cluster spacecraft at altitudes of about 4 Earth radii in the nightside auroral region. Observations of electric and magnetic wave fields, together with electron and ion data, are used as input to the methods. We find that much of the wave emissions are consistent with linear waves in homogeneous plasma. Observed waves with a large electric field perpendicular to the geomagnetic field are more common (electrostatic ion cyclotron waves), while ion acoustic waves with a large parallel electric field appear in smaller regions without suprathermal (tens of eV) plasma. The regions void of suprathermal plasma are interpreted as parallel potential drops of a few hundred volts.

  • 70. Bailer-Jones, Coryn
    et al.
    Warell, Johan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics.
    Lagerkvist, Claes-Ingvar
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics.
    CU8 Cycle 2 Scientific Algorithm Descriptions: GAIA-C8-SP-MPIA-CBJ-0282007Report (Other scientific)
  • 71. Barban, C.
    et al.
    Goupil, M. J.
    van’t Veer-Menneret, C.
    Garrido, R.
    Heiter, Ulrike
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    et al.,
    Limb darkening coefficients for the purpose of pulsation mode identification for A-F stars.2006In: Memorie della Societa Astronomica Italiana 77, 2006, p. 101-Conference paper (Other scientific)
  • 72.
    Barklem, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
    Electron-impact excitation of neutral oxygen2007In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 462, no 2, p. 781-788Article in journal (Refereed)
    Abstract [en]

    Aims.Our goal was to calculate transition rates from ground and excited states in neutral oxygen atoms due to electron collisions for non-LTE modelling of oxygen in late-type stellar atmospheres, thus enabling the reliable interpretation of oxygen lines in stellar spectra.Methods.A 38-state R-matrix calculation in LS-coupling has been performed. Basis orbitals from the literature are adopted, and a large set of configurations are included to obtain good representations of the target wave functions. Rate coefficients are calculated by averaging over a Maxwellian velocity distribution. Results.Estimates for the cross sections and rate coefficients are presented for transitions between the seven lowest LS states of neutral oxygen. The cross sections for excitation from the ground state compare well with existing experimental and recent theoretical results.

  • 73.
    Barklem, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
    Non-LTE Balmer line formation in late-type spectra: Effects of atomic processes involving hydrogen atoms2007In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 466, no 1, p. 327-337Article in journal (Refereed)
    Abstract [en]

    Context.The wings of Balmer lines are often used as effective temperature diagnostics for late-type (F, G, K) stars under the assumption they form in local thermodynamic equilibrium (LTE). Aims.Our goal is to investigate the non-LTE excitation and ionisation of hydrogen and the formation of Balmer lines in late-type stellar atmospheres, to establish if the assumption of LTE is justified. Furthermore, we aim to determine which collision processes are important for the problem; in particular, the role of collision processes with hydrogen atoms is investigated.Methods.A model hydrogen atom for non-LTE calculations has been constructed accounting for various collision processes using the best available data from the literature. The processes included are inelastic collisions with electrons and hydrogen atoms, mutual neutralisation and Penning ionisation. Non-LTE calculations are performed using the MULTI code and the MACKKL semi-empirical solar model, and the relative importance of the collision processes is investigated. Similar calculations are performed for MARCS theoretical models of other late-type stellar atmospheres.Results.Our calculations show electron collisions alone are not sufficient to establish LTE for the formation of Balmer line wings. Mutual neutralisation and Penning ionisation are found to be unimportant. The role of inelastic collisions with neutral hydrogen is unclear. The available data for these processes is of questionable quality, and different prescriptions for the rate coefficents give significantly different results for the Balmer line wings. Conclusions.Improved calculations or experimental data are needed for excitation and, particularly, ionisation of hydrogen atoms in low-lying states by hydrogen atom impact at near threshold energies. Until such data are available, the assumption of LTE for the formation of Balmer line wings in late-type stars is questionable.

  • 74.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Self-broadening of Balmer Lines Using Asymptotic Potentials: Application to Stellar Spectroscopy2004In: 17th International Conference on Spectral Line Shapes, 2004Conference paper (Other scientific)
  • 75.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Aspelund-Johansson, Jenny
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    The broadening of Fe II lines by neutral hydrogen collisions2005In: Astronomy and Astrophysics, Vol. 435, p. 373-377Article in journal (Refereed)
  • 76.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Belyaev, A. K.
    Asplund, M.
    Inelastic H+Li and H-+Li+ collisions and non-LTE Li I line formation in stellar atmospheres2003In: Astronomy & Astrophysics, Vol. 409, p. L1-L4Article in journal (Refereed)
  • 77.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Christlieb, Norbert
    Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Beers, T.C.
    Hill, V.
    Bessell, M.S.
    Holmberg, J.
    Marsteller, B.
    Rossi, S.
    Zickgraf, F.-J.
    Reimers, D.
    The Hamburg/ESO R-process Enhanced Star survey (HERES).: II. Spectroscopic analysis of the survey sample2005In: Astronomy and Astrophysics, Vol. 439, p. 129-151Article in journal (Refereed)
  • 78.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Christlieb, Norbert
    Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Beers, T.C.
    Hill, V
    Holmberg, J
    Marsteller, B
    Rossi, S
    Zickgraf, F.-J
    Bessell, M.S.
    The Hamburg/ESO R-process Enhanced Star survey (HERES).: Abundances2005In: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution, IAU Symposium Proceedings of the international Astronomical Union 228, 2005, p. 439-443Conference paper (Other (popular scientific, debate etc.))
  • 79.
    Barklem, Paul
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Kochukhov, Oleg
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Piskunov, Nikolai
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    O'Mara, B. J.
    Stempels, H. C.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Hydrogen Line Formation in Cool Stars2001In: 11th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun / [ed] Garcia Lopez, Ramon J.; Rebolo, Rafael; Zapaterio Osorio, Mario Rosa, San Francisco: Astronomical Society of the Pacific , 2001, p. 766-Conference paper (Other academic)
  • 80.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    O'Mara, BJ
    Broadening of lines of BeII, SrII and BaII by collisions with hydrogen atoms and the solar abundance of strontium2000In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, ISSN 0035-8711, Vol. 311, no 3, p. 535-540Article in journal (Refereed)
  • 81.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    O'Mara, B.J.
    Broadening of Spectral Lines of Singly Ionised Atoms by Collisions with Neutral Hydrogen Atoms2001In: 11th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, ASP Conference Proceedings, Vol. 223., 2001, p. 772-Conference paper (Other (popular scientific, debate etc.))
  • 82.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    O'Mara, B.J.
    Comments on alternative calculations of the broadening of spectral lines of neutral sodium by H-atom collisions2001In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, Vol. 34, p. 4785-4799Article in journal (Refereed)
  • 83.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Piskunov, Nikolai
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Hydrogen Balmer Lines as Probes of Stellar Atmospheres2003In: IAUS 210, Modelling of stellar atmospheres, 2003, p. E28-Conference paper (Other scientific)
  • 84.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Piskunov, Nikolai
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    O'Mara, BJ
    A list of data for the broadening of metallic lines by neutral hydrogen collisions2000In: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, ISSN 0365-0138, Vol. 142, no 3, p. 467-473Article in journal (Refereed)
  • 85.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Piskunov, Nikolai
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    O'Mara, BJ
    Self broadening of hydrogen lines: initial results2000In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 355, no 1, p. L5-L8Article in journal (Refereed)
  • 86.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Piskunov, Nikolai
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    O'Mara, BJ
    Self-broadening in Balmer line wing formation in stellar atmospheres2000In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 363, no 3, p. 1091-1105Article in journal (Refereed)
  • 87.
    Barklem, Paul
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Stempels, H.C.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Allende Prieto, C.
    Kochukhov, Oleg
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Piskunov, Nikolai
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    O'Mara, B.J.
    Detailed analysis of Balmer lines in cool dwarf stars2002In: Astronomy & Astrophysics, ISSN 0004-6361, Vol. 385, p. 951-Article in journal (Refereed)
  • 88.
    Barklem, Paul
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Stempels, H.C.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Kochukhov, Oleg
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Piskunov, Nikolai
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    O'Mara, J.B.
    Balmer lines and effective temperatures in cool stars2003In: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, 2003, p. 1103-Conference paper (Other academic)
  • 89.
    Bates, I., Balikhin, M., Alleyne, H. and Andre, M.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics.
    Minimum-variance free determination of magnetosheath wave propagation vectors.2001In: : Les Woolliscroft Memorial Conference Sheffield Space Plasma Meeting: Multipoint Measurements versus Theory. Proceedings (SP-492), , p. 133Other (Other scientific)
    Abstract [en]

    The direction of propagation of waves in the plasma is important when studying space plasma turbulence and the linear and nonlinear processes that occur. The usual procedure of determining this propagation direction involves minimum variance analysis. Thi

  • 90. Beers, T. C.
    et al.
    Christlieb, Norbert
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Bessell, M. S.
    Hill, V.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Korn, A.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Ryan, S. G.
    Rossi, S.
    Rhee, J.
    HERES: The Search for r-Process-Enhanced, Metal-Poor Stars2003In: Bulletin American Astronomical Society Meeting, 2003Conference paper (Other scientific)
  • 91. Beers, T. C.
    et al.
    Christlieb, Norbert
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Bessell, M. S.
    Hill, V.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Ryan, S. G.
    Rossi, S.
    Korn, A.
    Heres: the Search for R-Process Enhanced, Metal-Poor Stars2003In: Elemental Abundances in Old Stars and Damped Lyman-α Systems, 25th meeting of the IAU, Joint Discussion 15, 2003, p. p. 34-Conference paper (Other scientific)
  • 92. Beers, T.C.
    et al.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Christlieb, Norbert
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Hill, V.
    Efficient Searches for r-Process-Enhanced, Metal-Poor Stars2005In: Nuclear Physics A, Vol. 758, p. 595-598Article in journal (Other scientific)
  • 93. Beers, T.C.
    et al.
    Barklem, P.S.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Christlieb, Norbert
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Hill, V.
    Efficient searches for r-process-enhanced, metal-poor stars2005In: Nuclei in the Cosmos VIII, 2005Conference paper (Other scientific)
  • 94. Beers, T.C.
    et al.
    Lucatello, S.
    Marsteller, B.
    Sivarani, T.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Christlieb, Norbert
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Rossi, Silvia
    The frequency of Carbon-enhanced stars in HERES and SDSS2006In: Proceedings of the International Symposium on Nuclear Astrophysics: Nuclei in the Cosmos - IX. 25-30 June 2006, CERN, 2006Conference paper (Other (popular scientific, debate etc.))
  • 95. Beers, Timothy C.
    et al.
    Flynn, Chris
    Rossi, Silvia
    Sommer-Larsen, Jesper
    Wilhelm, Ronald
    Marsteller, Brian
    Lee, Young Sun
    De Lee, Nathan
    Krugler, Julie
    Deliyannis, Constantine P.
    Simmons, Andrew T.
    Mills, Elisabeth
    Zickgraf, Franz-Josef
    Holmberg, Johan
    Önehag, Anna
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
    Eriksson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
    Terndrup, Donald M.
    Salim, Samir
    Andersen, Johannes
    Nordström, Birgitta
    Christlieb, Norbert
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
    Frebel, Anna
    Rhee, Jaehyon
    Broadband UBVRCIC photometry of horizontal-branch and metal-poor candidates from the HK and Hamburg/ESO surveys. I.2007In: Astrophysical Journal Supplement Series, ISSN 0067-0049, E-ISSN 1538-4365, Vol. 168, no 1, p. 128-139Article in journal (Refereed)
    Abstract [en]

    We report broadband UBV and/or BVRCIC CCD photometry for a total of 1857 stars in the thick-disk and halo populations of the Galaxy. The majority of our targets were selected as candidate field horizontal-branch or other A-type stars (FHB/ A, N = 576), or candidate low-metallicity stars (N = 1221), from the HK and Hamburg/ESO objective-prism surveys. Similar data for a small number of additional stars from other samples are also reported. These data are being used for several purposes. In the case of the FHB/ A candidates they are used to accurately separate the lower gravity FHB stars from various higher gravity A-type stars, a subsample that includes the so-called blue metal poor stars, halo and thick-disk blue stragglers, main-sequence A-type dwarfs, and Am and Ap stars. These data are also being used to derive photometric distance estimates to high-velocity hydrogen clouds in the Galaxy and for improved measurements of the mass of the Galaxy. Photometric data for the metal-poor candidates are being used to refine estimates of stellar metallicity for objects with available medium-resolution spectroscopy, to obtain distance estimates for kinematic analyses, and to establish initial estimates of effective temperature for analysis of high-resolution spectroscopy of the stars for which this information now exists.

  • 96. Beghin, Christian
    et al.
    Dècrèau, Pierrette
    Pickett, Jolene
    Sundkvist, David
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
    Lefebvre, Bertrand
    Modeling of CLUSTER's electric antennas in space: application to plasma diagnostics2005In: Radio Science, ISSN 0048-6604, E-ISSN 1944-799X, Vol. 40, no 6, p. RS6008-Article in journal (Refereed)
    Abstract [en]

    [1] The main characteristics of the long-boom electric antennas installed on board the Cluster satellites are derived from finite element modeling in a kinetic and isotropic space plasma, in the frequency range of about 1–100 kHz. The model is based on the surface charge distribution method in quasi-static conditions. The impedances of both types of antenna, i.e., the double-wire and the double-probe, are computed versus the frequency normalized with respect to the local plasma frequency and for several different Debye lengths. Most of the code outputs are checked using analytic estimations for better understanding of the involved physical mechanisms. As a by-product, the effective length of the double-probe antenna and the mutual impedance between the two antennas are computed by the code. It is shown that if it had been possible to implement such measurements on board, one would have been able not only to determine accurately the electric characteristics of the antennas but also to estimate the local plasma parameters. Nevertheless, an interesting feature predicted by the model has been checked recently in orbit by running a special mode of operation for testing the mutual impedance measurement. The preliminary results are globally consistent with the predictions, except that they suggest that our Maxwellian model for the electron distribution should be revised in order to explain the unexpected low-frequency response. After analysis of the electron flux measurements obtained simultaneously, it appears that a rough adjustment of the electron distribution with a two-component distribution allows us to account for the observations.

  • 97.
    Behlke, Rico
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics.
    Dissipation at the Earth's Quasi-Parallel Bow Shock2005Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The Earth's bow shock is a boundary where the solar wind becomes decelerated from supersonic to subsonic speed before being deflected around the Earth. This thesis presents measurements by the Cluster spacecraft upstream and at the Earth's quasi-parallel bow shock where the angle between the upstream magnetic field and the bow shock normal is less than 45 degrees. An intrinsic feature of quasi-parallel shocks is the ability of ions, that are reflected off the shock in a specular manner, to propagate far upstream and to interact with the incident solar wind. This leads to the generation of a variety of plasma waves, e.g., Ultra-Low Frequency (ULF) waves, which in their turn interact with the different ion populations. Some of the ULF waves are thought to steepen into so-called Short Large-Amplitude Magnetic Structures (SLAMS).

    This thesis studies the impact of SLAMS on the incident solar wind. SLAMS are thought to play an important role in terms of 1) returning shock-reflected ions back to the shock where they can eventually contribute to downstream thermalisation and 2) local pre-dissipation of the solar wind.

    The first electric field measurements of SLAMS showed a strong electric field rotation over SLAMS in association with the rotation of the magnetic field. This often leads to a local change from quasi-parallel to quasi-perpendicular conditions. In addition, short-scale electric field features were observed, e.g., spiky electric field structures associated with the leading edge of SLAMS and solitary electric field structures on Debye length scales, which are suggested to represent ion phase space holes.

    Using the abilitiy of the four Cluster satellites to obtain propagation vectors of SLAMS and the high-resolution electric field measurements, the electric potential over SLAMS was studied. These structures are associated with a significant potential on the order of a few hundred to thousand Volt. Comparing these findings with data from the ion spectrometer, it was found that the bulk flow is locally significantly decelerated and moderately deflected and heated. In addition, SLAMS reflect incident ions on both the leading and trailing edge. The flux of so-called gyrating ions show a clear maximum in association with SLAMS. This indicates that SLAMS indeed play an important role for pre-dissipation of the solar wind upstream of the shock.

    List of papers
    1. Multi-point electric field measurements of Short Large-Amplitude Magnetic Structures (SLAMS) at the Earth' quasi-parallel bow shock
    Open this publication in new window or tab >>Multi-point electric field measurements of Short Large-Amplitude Magnetic Structures (SLAMS) at the Earth' quasi-parallel bow shock
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    2003 In: Geophysical Research Letters, ISSN 0094-8276, Vol. 30, no 4Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-93709 (URN)
    Available from: 2005-11-24 Created: 2005-11-24 Last updated: 2014-11-12Bibliographically approved
    2. Solitary structures associated with short large-amplitude magnetic structures (SLAMS) upstream of the Earth's quasi-parallel bow shock
    Open this publication in new window or tab >>Solitary structures associated with short large-amplitude magnetic structures (SLAMS) upstream of the Earth's quasi-parallel bow shock
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    2004 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 31, no 16Article in journal (Refereed) Published
    Abstract [en]

    [1] For the first time, solitary waves (SWs) have been observed within short large-amplitude magnetic structures (SLAMS) upstream of the Earth's quasi-parallel bow shock. The SWs often occur as bipolar pulses in the electric field data and move parallel to the background magnetic field at velocities of v = 400–1200 km/s. They have peak-to-peak amplitudes in the parallel electric field of up to E = 65 mV/m and parallel scale sizes of L ∼ 10 λD. The bipolar solitary waves exhibit negative potential structures of ∣Φ∣ = 0.4–2.2 V, i.e., eΦ/kTe ∼ 0.1. None of the theories commonly used to describe SWs adequately address these negative potential structures moving at velocities above the ion thermal speed in a weakly magnetized plasma.

    National Category
    Natural Sciences
    Identifiers
    urn:nbn:se:uu:diva-93710 (URN)10.1029/2004GL019524 (DOI)
    Available from: 2005-11-24 Created: 2005-11-24 Last updated: 2017-12-14Bibliographically approved
    3. The electric potentialat the Earth's quasi-parallel bow shock: Initial Cluster results
    Open this publication in new window or tab >>The electric potentialat the Earth's quasi-parallel bow shock: Initial Cluster results
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    2005 In: The physics of collisionless shocks: 4th Annual IGPP International Astrophysics Conference, 2005, p. 79-83Chapter in book (Other academic) Published
    Identifiers
    urn:nbn:se:uu:diva-93711 (URN)0-7354-0268-X (ISBN)
    Available from: 2005-11-24 Created: 2005-11-24Bibliographically approved
    4. Cluster observations of the electric potential at the Earth's quasi-parallel bow shock
    Open this publication in new window or tab >>Cluster observations of the electric potential at the Earth's quasi-parallel bow shock
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    2005 In: Annales Geophysicae, ISSN 0992-7689Article in journal (Refereed) Submitted
    Identifiers
    urn:nbn:se:uu:diva-93712 (URN)
    Available from: 2005-11-24 Created: 2005-11-24Bibliographically approved
    5. Dissipation properties of SLAMS upstream of the Earth's quasi-parallel bow shock
    Open this publication in new window or tab >>Dissipation properties of SLAMS upstream of the Earth's quasi-parallel bow shock
    Manuscript (Other academic)
    Identifiers
    urn:nbn:se:uu:diva-93713 (URN)
    Available from: 2005-11-24 Created: 2005-11-24 Last updated: 2010-01-13Bibliographically approved
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  • 98.
    Behlke, Rico
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Space Plasma Physics.
    Observations by the Cluster satelites at the Earth´s quasi-parallel bow shock2003Licentiate thesis, monograph (Other scientific)
  • 99.
    Behlke, Rico
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Space Plasma Physics.
    Solar radio bursts and low frequency radio emissions from space2001In: IRF Scientific Report 275Article in journal (Refereed)
  • 100.
    Behlke, Rico
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Space Plasma Physics.
    The electric potential at the Earth´s quasi-parallel bow shock2005In: AIP Conference Proceedings 781, 2005Conference paper (Other (popular scientific, debate etc.))
1234567 51 - 100 of 1015
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