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| Titel |
Ion composition variety and variability around perihelion |
| VerfasserIn |
Arnaud Beth, Kathrin Altwegg  , Etienne Behar, Tom Broiles, Jim Burch, Christopher Carr, Anders Eriksson, Marina Galand, Charlotte Goetz, Pierre Henri, Kevin Héritier, Hans Nilsson, Elias Odelstad, Ingo Richter, Martin Rubin, Xavier Vallières |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250138030
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| Publikation (Nr.) |
 EGU/EGU2017-928.pdf |
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| Zusammenfassung |
| For two years, the Double Focusing Mass Spectrometer (DFMS), one of the Rosetta Orbiter
Spectrometer for Ion and Neutral Analysis (ROSINA) onboard Rosetta probed the neutral gas
and the plasma composition of the comet 67P/Churyumov-Gerasimenko’s coma (67P). Major
ion species detected include water ions (e.g, H2O+, H3O+, HO+) observed throughout the
escorting phase. The analysis of DFMS data revealed a large zoo of ion species near
perihelion (summer 2015). In particular, protonated versions of high proton affinity neutrals
(e.g., NH4+) were detected, but also hydrocarbon and organic ion species. Near perihelion,
ion composition was also highly variable and showed interesting variations in the complexity
of the observed ion species.
We will first present an overview of the rich variety of ion species observed during
perihelion. This study will be supported by ionospheric modeling of ion composition below
the ion exobase. We will then show an intercomparison between DFMS data and Rosetta
Plasma Consortium (RPC) plasma and particle data to interpret the DFMS ion composition
variability. Our primary goal is to highlight any correlation between observations from these
different instruments (i.e. ion composition, ion and electron number density, energy
distribution, magnetic field) and to find relevant signatures of physical processes which can
affect the chemistry and dynamics (e.g., acceleration and deflection) of the involved neutral
and ion species. |
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