Imperial College London
Alternate

ProfessorMarinaGaland

Faculty of Natural Sciences, Department of Physics

Professor in Planetary Science
 
 
 
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Contact

 

m.galand Website

 
 
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Location

 

Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Vigren:2019:1538-4357/ab29f7,
author = {Vigren, E and Edberg, NJT and Eriksson, A and Galand, M and Henri, P and Johansson, FL and Odelstad, E and Rubin, M and Vallieres, X},
doi = {1538-4357/ab29f7},
journal = {The Astrophysical Journal: an international review of astronomy and astronomical physics},
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},
url = {http://dx.doi.org/10.3847/1538-4357/ab29f7},
volume = {881},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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.
AU  - Vigren,E
AU  - Edberg,NJT
AU  - Eriksson,A
AU  - Galand,M
AU  - Henri,P
AU  - Johansson,FL
AU  - Odelstad,E
AU  - Rubin,M
AU  - Vallieres,X
DO  - 1538-4357/ab29f7
PY  - 2019///
SN  - 0004-637X
TI  - The Evolution of the Electron Number Density in the Coma of Comet 67P at the Location of Rosetta from 2015 November through 2016 March
T2  - The Astrophysical Journal: an international review of astronomy and astronomical physics
UR  - http://dx.doi.org/10.3847/1538-4357/ab29f7
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000479099500006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/73969
VL  - 881
ER  -
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