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| Titel |
Cometary Plasma Probed by Rosetta |
| VerfasserIn |
Marina Galand, Erik Vigren, Susarla Raghuram, Steve Schwartz, Anders Eriksson, Niklas Edberg, Jean-Pierre Lebreton, Pierre Henri, Jim Burch, Stephen Fuselier, Myrtha Haessig, Kathy Mandt, Kathrin Altwegg  , Chia-You Tzou |
| 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 |
250110756
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| Publikation (Nr.) |
 EGU/EGU2015-10783.pdf |
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| Zusammenfassung |
| In Fall 2014, comet 67P/Churyumov-Gerasimenko, the main target of the Rosetta
mission, was at 3ÂAU from the Sun. Its outgassing rate was only of the order of
5x1025 s-1 based on Rosetta Orbiter Spectrometer for Ion and Neutral Analysis
(ROSINA) / Cometary Pressure Sensor (COPS). Despite such a thin coma, a plasma of
cometary origin has been detected by Rosetta Plasma Consortium (RPC) sensors and
ROSINA/ Double Focusing Mass Spectrometer (DFMS). Close to the comet they have
revealed the presence of a cometary ionosphere, with a hot electron population,
consistent with the deposition of Extreme UltraViolet (EUV) solar radiation. We will
present a comparison between RPC sensors and an energy deposition model in
terms of suprathermal electron intensities [RPC/ Ion and Electron Sensor (IES)] and
electron temperature and density [RPC/ LAngmuir Probe (LAP) and RPC/ Mutual
Impedance Probe (MIP)]. We will also compare ion composition among the main
species, between our ionospheric model and ROSINA/DFMS. We will discuss
effects of the space environment on the cometary plasma. Finally, we will highlight
any evolution in the cometary plasma as the comet is getting closer to perihelion. |
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