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| Titel |
A comet's tale: Role of charge exchange in the plasma environment of comet 67P/Churyumov-Gerasimenko |
| VerfasserIn |
Cyril Simon Wedlund, Esa Kallio, Markku Alho, Sergey Dyadechkin, Hans Nilsson, Gabriella Stenberg Wieser, Etienne Behar, Herbert Gunell, Mats Holmström |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250110674
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| Publikation (Nr.) |
 EGU/EGU2015-10701.pdf |
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| Zusammenfassung |
| On 6 Aug. 2014, the Rosetta mission arrived in the vicinity of comet 67P/Churyumov-Gerasimenko
(C-G) and started measuring its complex plasma environment, using notably the RPC-ICA
ion spectrometer (Rosetta Plasma Consortium Ion Composition Analyser). A simple model of
charge-exchange processes is first presented for He2+ and H+ solar wind ions that efficiently
convert them into He+ ions (measured by RPC-ICA) and H energetic neutral atoms,
respectively. In a second step, we present a new cometary hybrid plasma model, taking into
account photoionisation, charge-exchange, electron impact ionisation and electron
recombination, dedicated to the interpretation of RPC-ICA measurements. We use this global
model to investigate in more detail the role of the water production rate and charge-exchange
processes in the formation of plasma regions at comet 67P/C-G and for various heliocentric
distances. |
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