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| Titel |
Oxygen ion escape from Venus in a global hybrid simulation: role of the ionospheric O+ ions |
| VerfasserIn |
R. Jarvinen, E. Kallio, P. Janhunen  , S. Barabash, T. L. Zhang, V. Pohjola, I. Sillanpää |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 11 ; Nr. 27, no. 11 (2009-11-27), S.4333-4348 |
| Datensatznummer |
250016714
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4333-2009.pdf |
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| Zusammenfassung |
| We study the solar wind induced oxygen ion escape from Venus' upper
atmosphere and the Venus Express observations of the Venus-solar wind
interaction by the HYB-Venus hybrid simulation code. We compare the
simulation to the magnetic field and ion observations during an orbit of
nominal upstream conditions. Further, we study the response of the induced
magnetosphere to the emission of planetary ions. The hybrid simulation is
found to be able to reproduce the main observed regions of the Venusian
plasma environment: the bow shock (both perpendicular and parallel regions),
the magnetic barrier, the central tail current sheet, the magnetic tail
lobes, the magnetosheath and the planetary wake. The simulation is found to
best fit the observations when the planetary \oxy~escape rate is in the range
from 3×1024 s−1 to 1.5×1025 s−1. This range
was also found to be a limit for a test particle-like behaviour of the
planetary ions: the higher escape rates manifest themselves in a different
global configuration of the Venusian induced magnetosphere. |
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