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The Evolution of the Electron Number Density in the Coma of Comet 67P at the Location of Rosetta from 2015 November through 2016 March

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Title: The Evolution of the Electron Number Density in the Coma of Comet 67P at the Location of Rosetta from 2015 November through 2016 March
Authors: Vigren, E
Edberg, NJT
Eriksson, A
Galand, M
Henri, P
Johansson, FL
Odelstad, E
Rubin, M
Vallieres, X
Item Type: Journal Article
Abstract: A comet ionospheric model assuming the plasma moves radially outward with the same bulk speed as the neutral gas and not being subject to severe reduction through dissociative recombination has previously been tested in a series of case studies associated with the Rosetta mission at comet 67P/Churyumov–Gerasimenko. It has been found that at low activity and within several tens of kilometers from the nucleus such models (which originally were developed for such conditions) generally work well in reproducing observed electron number densities, in particular when plasma production through both photoionization and electron-impact ionization is taken into account. Near perihelion, case studies have, on the contrary, shown that applying similar assumptions overestimates the observed electron number densities at the location of Rosetta. Here we compare Rosetta Orbiter Spectrometer for Ion and Neutral Analysis/Comet Pressure sensor-driven model results with Rosetta Plasma Consortium/Mutual Impedance Probe-derived electron number densities for an extended time period (2015 November through 2016 March) during the postperihelion phase with southern summer/spring. We observe a gradual transition from a state when the model grossly overestimates (by more than a factor of 10) the observations to being in reasonable agreement during 2016 March.
Issue Date: 10-Aug-2019
Date of Acceptance: 12-Jun-2019
URI: http://hdl.handle.net/10044/1/73969
DOI: https://dx.doi.org/10.3847/1538-4357/ab29f7
ISSN: 0004-637X
Publisher: American Astronomical Society
Journal / Book Title: The Astrophysical Journal: an international review of astronomy and astronomical physics
Volume: 881
Issue: 1
Copyright Statement: © 2019. The American Astronomical Society. All rights reserved.
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
comets: individual (67P)
molecular processes
PLASMA
67P/CHURYUMOV-GERASIMENKO
ION
IONOSPHERE
MODEL
RPC
Science & Technology
Physical Sciences
Astronomy & Astrophysics
comets: individual (67P)
molecular processes
PLASMA
67P/CHURYUMOV-GERASIMENKO
ION
IONOSPHERE
MODEL
RPC
astro-ph.EP
astro-ph.EP
physics.space-ph
0201 Astronomical and Space Sciences
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
0306 Physical Chemistry (incl. Structural)
Astronomy & Astrophysics
Publication Status: Published
Article Number: ARTN 6
Online Publication Date: 2019-08-06
Appears in Collections:Space and Atmospheric Physics
Physics



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