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Publications (10 of 47) Show all publications
Perri, S., Yordanova, E. & Puzzarini, C. (2024). Editorial: Women in science: astronomy and space sciences. Frontiers in Astronomy and Space Sciences, 11, Article ID 1378816.
Open this publication in new window or tab >>Editorial: Women in science: astronomy and space sciences
2024 (English)In: Frontiers in Astronomy and Space Sciences, E-ISSN 2296-987X, Vol. 11, article id 1378816Article in journal, Editorial material (Other academic) Published
Place, publisher, year, edition, pages
Frontiers Media S.A., 2024
Keywords
astrochemistry, solar wind, energetic particle, turbulence, non-linear dynamic
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-525501 (URN)10.3389/fspas.2024.1378816 (DOI)001180082200001 ()
Available from: 2024-03-22 Created: 2024-03-22 Last updated: 2024-03-22Bibliographically approved
Yordanova, E., Temmer, M., Dumbovic, M., Scolini, C., Paouris, E., Werner, A. L., . . . Sorriso-Valvo, L. (2024). Refined Modeling of Geoeffective Fast Halo CMEs During Solar Cycle 24. Space Weather: The International Journal of Research and Application, 22(1), Article ID e2023SW003497.
Open this publication in new window or tab >>Refined Modeling of Geoeffective Fast Halo CMEs During Solar Cycle 24
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2024 (English)In: Space Weather: The International Journal of Research and Application, E-ISSN 1542-7390, Vol. 22, no 1, article id e2023SW003497Article in journal (Refereed) Published
Abstract [en]

The propagation of geoeffective fast halo coronal mass ejections (CMEs) from solar cycle 24 has been investigated using the European Heliospheric Forecasting Information Asset (EUHFORIA), ENLIL, Drag-Based Model (DBM) and Effective Acceleration Model (EAM) models. For an objective comparison, a unified set of a small sample of CME events with similar characteristics has been selected. The same CME kinematic parameters have been used as input in the propagation models to compare their predicted arrival times and the speed of the interplanetary (IP) shocks associated with the CMEs. The performance assessment has been based on the application of an identical set of metrics. First, the modeling of the events has been done with default input concerning the background solar wind, as would be used in operations. The obtained CME arrival forecast deviates from the observations at L1, with a general underestimation of the arrival time and overestimation of the impact speed (mean absolute error [MAE]: 9.8 ± 1.8–14.6 ± 2.3 hr and 178 ± 22–376 ± 54 km/s). To address this discrepancy, we refine the models by simple changes of the density ratio (dcld) between the CME and IP space in the numerical, and the IP drag (γ) in the analytical models. This approach resulted in a reduced MAE in the forecast for the arrival time of 8.6 ± 2.2–13.5 ± 2.2 hr and the impact speed of 51 ± 6–243 ± 45 km/s. In addition, we performed multi-CME runs to simulate potential interactions. This leads, to even larger uncertainties in the forecast. Based on this study we suggest simple adjustments in the operational settings for improving the forecast of fast halo CMEs.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2024
Keywords
halo CME, background solar wind, CME arrival time, CME impact speed, space weather forecast
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-523242 (URN)10.1029/2023SW003497 (DOI)001143522800001 ()
Funder
Swedish National Space Board, 192/20The European Space Agency (ESA)Swedish Civil Contingencies Agency, 2016-2102
Available from: 2024-02-19 Created: 2024-02-19 Last updated: 2024-02-19Bibliographically approved
Richard, L., Sorriso-Valvo, L., Yordanova, E., Graham, D. B. & Khotyaintsev, Y. V. (2024). Turbulence in Magnetic Reconnection Jets from Injection to Sub-Ion Scales. Physical Review Letters, 132(10), Article ID 105201.
Open this publication in new window or tab >>Turbulence in Magnetic Reconnection Jets from Injection to Sub-Ion Scales
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2024 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 132, no 10, article id 105201Article in journal (Refereed) Published
Abstract [en]

We investigate turbulence in magnetic reconnection jets in the Earth’s magnetotail using data from the Magnetospheric Multiscale spacecraft. We show that signatures of a limited inertial range are observed in many reconnection jets. The observed turbulence develops on the timescale of a few ion gyroperiods, resulting in intermittent multifractal energy cascade from the characteristic scale of the jet down to the ion scales. We show that at sub-ion scales, the fluctuations are close to monofractal and predominantly kinetic Alfvén waves. The observed energy transfer rate across the inertial range is ∼108  J kg−1 s−1, which is the largest reported for space plasmas so far.

Place, publisher, year, edition, pages
American Physical Society, 2024
National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:uu:diva-516435 (URN)10.1103/PhysRevLett.132.105201 (DOI)001196477400008 ()38518330 (PubMedID)
Funder
Swedish National Space Board, 139/18Swedish National Space Board, 145/18Swedish Research Council, 2022-03352
Available from: 2023-11-21 Created: 2023-11-21 Last updated: 2024-04-19Bibliographically approved
Svenningsson, I., Yordanova, E., Khotyaintsev, Y. V., André, M., Cozzani, G. & Steinvall, K. (2024). Whistler Waves in the Quasi-Parallel and Quasi-Perpendicular Magnetosheath. Journal of Geophysical Research - Space Physics, 129(6), Article ID e2024JA032661.
Open this publication in new window or tab >>Whistler Waves in the Quasi-Parallel and Quasi-Perpendicular Magnetosheath
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2024 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 129, no 6, article id e2024JA032661Article in journal (Refereed) Published
Abstract [en]

In the Earth's magnetosheath (MSH), several processes contribute to energy dissipation and plasma heating, one of which is wave-particle interactions between whistler waves and electrons. However, the overall impact of whistlers on electron dynamics in the MSH remains to be quantified. We analyze 18 hr of burst-mode measurements from the Magnetospheric Multiscale (MMS) mission, including data from the unbiased magnetosheath campaign during February-March 2023. We present a statistical study of 34,409 whistler waves found using automatic detection. We compare wave occurrence in the different MSH geometries and find three times higher occurrence in the quasi-perpendicular MSH compared to the quasi-parallel case. We also study the wave properties and find that the waves propagate quasi-parallel to the background magnetic field, have a median frequency of 0.2 times the electron cyclotron frequency, median amplitude of 0.03-0.06 nT (30-60 pT), and median duration of a few tens of wave periods. The whistler waves are preferentially observed in local magnetic dips and density peaks and are not associated with an increased temperature anisotropy. Also, almost no whistlers are observed in regions with parallel electron plasma beta lower than 0.1. Importantly, when estimating pitch-angle diffusion times we find that the whistler waves cause significant pitch-angle scattering of electrons in the MSH. Whistlers exist throughout the magnetosheath with higher occurrence in the quasi-perpendicular geometry and in local magnetic field dips Whistlers are observed in regions with electron beta above 0.1 and are not correlated with electron temperature anisotropy Whistlers cause significant pitch-angle scattering of magnetosheath electrons

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2024
Keywords
magnetosheath, whistler waves, pitch-angle diffusion, cyclotron resonance
National Category
Fusion, Plasma and Space Physics Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-534073 (URN)10.1029/2024JA032661 (DOI)001247258800001 ()
Funder
Swedish Research CouncilSwedish National Space Board, 145/18Swedish National Space Board, 192/20
Available from: 2024-07-03 Created: 2024-07-03 Last updated: 2024-07-03Bibliographically approved
Chiappetta, F., Yordanova, E., Voros, Z., Lepreti, F. & Carbone, V. (2023). Energy Conversion through a Fluctuation-Dissipation Relation at Kinetic Scales in the Earth's Magnetosheath. Astrophysical Journal, 957(2), Article ID 98.
Open this publication in new window or tab >>Energy Conversion through a Fluctuation-Dissipation Relation at Kinetic Scales in the Earth's Magnetosheath
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2023 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 957, no 2, article id 98Article in journal (Refereed) Published
Abstract [en]

Low-frequency fluctuations in the interplanetary medium represent a turbulent environment where universal scaling behavior, generated by an energy cascade, has been investigated. On the contrary, in some regions, for example, the magnetosheath, universality of statistics of fluctuations is lost. However, at kinetic scales where energy must be dissipated, the energy conversion seems to be realized through a mechanism similar to the free solar wind. Here we propose a Langevin model for magnetic fluctuations at kinetic scales, showing that the resulting fluctuation-dissipation relation is capable of describing the gross features of the spectral observations at kinetic scales in the magnetosheath. The fluctuation-dissipation relation regulates the energy conversion by imposing a relationship between fluctuations and dissipation, which at high frequencies are active at the same time in the same range of scales and represent two ingredients of the same physical process.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2023
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-520772 (URN)10.3847/1538-4357/acfca2 (DOI)001093181300001 ()
Funder
Swedish National Space Board, P33285-N
Available from: 2024-01-17 Created: 2024-01-17 Last updated: 2024-01-17Bibliographically approved
Sorriso-Valvo, L., Marino, R., Foldes, R., Leveque, E., D'Amicis, R., Bruno, R., . . . Yordanova, E. (2023). Helios 2 observations of solar wind turbulence decay in the inner heliosphere. Astronomy and Astrophysics, 672, Article ID A13.
Open this publication in new window or tab >>Helios 2 observations of solar wind turbulence decay in the inner heliosphere
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2023 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 672, article id A13Article in journal (Refereed) Published
Abstract [en]

Aims: A linear scaling of the mixed third-order moment of the magnetohydrodynamic (MHD) fluctuations is used to estimate the energy transfer rate of the turbulent cascade in the expanding solar wind.

Methods: In 1976, the Helios 2 spacecraft measured three samples of fast solar wind originating from the same coronal hole, at different distances from the Sun. Along with the adjacent slow solar wind streams, these intervals represent a unique database for studying the radial evolution of turbulence in samples of undisturbed solar wind. A set of direct numerical simulations of the MHD equations performed with the Lattice-Boltzmann code FLAME was also used for interpretation.

Results: We show that the turbulence energy transfer rate decays approximately as a power law of the distance and that both the amplitude and decay law correspond to the observed radial temperature profile in the fast wind case. Results from MHD numerical simulations of decaying MHD turbulence show a similar trend for the total dissipation, suggesting an interpretation of the observed dynamics in terms of decaying turbulence and that multi-spacecraft studies of the solar wind radial evolution may help clarify the nature of the evolution of the turbulent fluctuations in the ecliptic solar wind.

Place, publisher, year, edition, pages
EDP Sciences, 2023
Keywords
solar wind, turbulence, magnetohydrodynamics (MHD)
National Category
Astronomy, Astrophysics and Cosmology Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:uu:diva-507495 (URN)10.1051/0004-6361/202244889 (DOI)000989386800007 ()
Funder
Swedish Research Council, 86/20Swedish Research Council, 145/18
Available from: 2023-07-07 Created: 2023-07-07 Last updated: 2023-07-07Bibliographically approved
Voeroes, Z., Roberts, O. W., Yordanova, E., Sorriso-Valvo, L., Nakamura, R., Narita, Y., . . . Kis, A. (2023). How to improve our understanding of solar wind-magnetosphere interactions on the basis of the statistical evaluation of the energy budget in the magnetosheath?. Frontiers in Astronomy and Space Sciences, 10, Article ID 1163139.
Open this publication in new window or tab >>How to improve our understanding of solar wind-magnetosphere interactions on the basis of the statistical evaluation of the energy budget in the magnetosheath?
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2023 (English)In: Frontiers in Astronomy and Space Sciences, E-ISSN 2296-987X, Vol. 10, article id 1163139Article in journal (Refereed) Published
Abstract [en]

Solar wind (SW) quantities, referred to as coupling parameters (CPs), are often used in statistical studies devoted to the analysis of SW-magnetosphere-ionosphere couplings. Here, the CPs and their limitations in describing the magnetospheric response are reviewed. We argue that a better understanding of SW magnetospheric interactions could be achieved through estimations of the energy budget in the magnetosheath (MS), which is the interface region between the SW and magnetosphere. The energy budget involves the energy transfer between scales, energy transport between locations, and energy conversions between electromagnetic, kinetic, and thermal energy channels. To achieve consistency with the known multi-scale complexity in the MS, the energy terms have to be complemented with kinetic measures describing some aspects of ion-electron scale physics.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2023
Keywords
solar wind, magnetosphere, coupling parameters, turbulence, energy budget
National Category
Energy Systems
Identifiers
urn:nbn:se:uu:diva-508188 (URN)10.3389/fspas.2023.1163139 (DOI)001016707100001 ()
Funder
Swedish National Space Board, 192/20Swedish Research Council, 145/18
Available from: 2023-07-21 Created: 2023-07-21 Last updated: 2023-07-21Bibliographically approved
Benella, S., Stumpo, M., Alberti, T., Pezzi, O., Papini, E., Yordanova, E., . . . Consolini, G. (2023). Linking the Langevin equation to scaling properties of space plasma turbulence at sub-ion scales. Physical Review Research, 5(4), Article ID L042014.
Open this publication in new window or tab >>Linking the Langevin equation to scaling properties of space plasma turbulence at sub-ion scales
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2023 (English)In: Physical Review Research, E-ISSN 2643-1564, Vol. 5, no 4, article id L042014Article in journal (Refereed) Published
Abstract [en]

Current understanding of the kinetic-scale turbulence in weakly collisional plasmas still remains elusive. We employ a general framework in which the turbulent energy transfer is envisioned as a scale-to-scale Langevin process. Fluctuations in the sub-ion range show a global scale invariance, thus suggesting a homogeneous energy repartition. In this Letter, we interpret such a feature by linking the drift term of the Langevin equation to scaling properties of fluctuations. Theoretical expectations are verified on solar wind observations and numerical simulations, thus giving relevance to the proposed framework for understanding kinetic-scale turbulence in space plasmas.

Place, publisher, year, edition, pages
American Physical Society, 2023
National Category
Fusion, Plasma and Space Physics Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-524670 (URN)10.1103/PhysRevResearch.5.L042014 (DOI)001147727200003 ()
Available from: 2024-03-12 Created: 2024-03-12 Last updated: 2024-03-12Bibliographically approved
Gurchumelia, A., Sorriso-Valvo, L., Burgess, D., Yordanova, E., Elbakidze, K., Kharshiladze, O. & Kvaratskhelia, D. (2022). Comparing Quasi-Parallel and Quasi-Perpendicular Configuration in the Terrestrial Magnetosheath: Multifractal Analysis. Frontiers in Physics, 10, Article ID 903632.
Open this publication in new window or tab >>Comparing Quasi-Parallel and Quasi-Perpendicular Configuration in the Terrestrial Magnetosheath: Multifractal Analysis
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2022 (English)In: Frontiers in Physics, E-ISSN 2296-424X, Vol. 10, article id 903632Article in journal (Refereed) Published
Abstract [en]

The terrestrial magnetosheath is characterized by large-amplitude magnetic field fluctuations. In some regions, and depending on the bow-shock geometry, these can be observed on several scales, and show the typical signatures of magnetohydrodynamic turbulence. Using Cluster data, magnetic field spectra and flatness are observed in two intervals separated by a sharp transition from quasi-parallel to quasi-perpendicular magnetic field with respect to the bow-shock normal. The multifractal generalized dimensions D-q and the corresponding multifractal spectrum f(alpha) were estimated using a coarse-graining method. A p-model fit was used to obtain a single parameter to describe quantitatively the strength of multifractality and intermittency. Results show a clear transition and sharp differences in the intermittency properties for the two regions, with the quasi-parallel turbulence being more intermittent.

Place, publisher, year, edition, pages
Frontiers Media S.A.Frontiers Media SA, 2022
Keywords
magnetosheath, turbulence, multifractals, space plasma, magnetohydrodynamics (MHD)
National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:uu:diva-480005 (URN)10.3389/fphy.2022.903632 (DOI)000811893300001 ()
Available from: 2022-07-06 Created: 2022-07-06 Last updated: 2024-01-15Bibliographically approved
Telloni, D., Voeroes, Z., Yordanova, E. & D'Amicis, R. (2022). Editorial: Magnetic Connectivity of the Earth and Planetary Environments to the Sun in Space Weather Studies. Frontiers in Astronomy and Space Sciences, 9, Article ID 853925.
Open this publication in new window or tab >>Editorial: Magnetic Connectivity of the Earth and Planetary Environments to the Sun in Space Weather Studies
2022 (English)In: Frontiers in Astronomy and Space Sciences, E-ISSN 2296-987X, Vol. 9, article id 853925Article in journal, Editorial material (Other academic) Published
Place, publisher, year, edition, pages
Progressive Frontiers Press, 2022
Keywords
space weather, Sun, interplanetary medium, planetary systems, magnetohydrodynamics (MHD)
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-470748 (URN)10.3389/fspas.2022.853925 (DOI)000767518500001 ()
Funder
Swedish National Space Board, 145/18
Available from: 2022-03-29 Created: 2022-03-29 Last updated: 2022-03-29Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-9707-3147

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