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Model-Observation Comparisons Of Electron Number Densities In The Coma Of 67P/Churyumov-Gerasimenko During 2015 January
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
Univ Bern, Inst Phys, Bern, Switzerland..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
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2016 (English)In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 152, no 3, 59Article in journal (Refereed) Published
Abstract [en]

During 2015 January 9-11, at a heliocentric distance of similar to 2.58-2.57 au, the ESA Rosetta spacecraft resided at a cometocentric distance of similar to 28 km from the nucleus of comet 67P/Churyumov-Gerasimenko, sweeping the terminator at northern latitudes of 43 degrees N-58 degrees N. Measurements by the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis/Comet Pressure Sensor (ROSINA/COPS) provided neutral number densities. We have computed modeled electron number densities using the neutral number densities as input into a Field Free Chemistry Free model, assuming H2O dominance and ion-electron pair formation by photoionization only. A good agreement (typically within 25%) is found between the modeled electron number densities and those observed from measurements by the Mutual Impedance Probe (RPC/MIP) and the Langmuir Probe (RPC/LAP), both being subsystems of the Rosetta Plasma Consortium. This indicates that ions along the nucleus-spacecraft line were strongly coupled to the neutrals, moving radially outward with about the same speed. Such a statement, we propose, can be further tested by observations of H3O+/H2O+ number density ratios and associated comparisons with model results.

Place, publisher, year, edition, pages
2016. Vol. 152, no 3, 59
Keyword [en]
comets: individual (67P), molecular processes
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-305483DOI: 10.3847/0004-6256/152/3/59ISI: 000383804300007OAI: oai:DiVA.org:uu-305483DiVA: diva2:1038515
Funder
Swedish National Space Board, 109/02 114/13 135/13 166/14Swedish Research Council, 621-2013-4191 621-2014-5526
Note

Correction in: Astronomical journal, Volume: 153, Issue: 1, Article Number: 50

DOI: 10.3847/0004-6256/153/1/50

Available from: 2016-10-18 Created: 2016-10-18 Last updated: 2017-11-14Bibliographically approved

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Vigren, ErikEdberg, Niklas J. T.Eriksson, Anders. I.Johansson, FredrikOdelstad, Elias
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Swedish Institute of Space Physics, Uppsala DivisionSpace Plasma Physics
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