Computer Science
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..770f&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Computer Science
Scientific paper
The plasma wake of Venus is filled by ions of planetary origin. Recent measurements on the Ion Mass Analyser (IMA) onboard Venus Express show that acceleration of these ions depends on their spatial position in the tail. We found that the tail cross-section can be divided into 2 principal regions : • The plasma sheet de fined as the region in the -0.3 < YV SE < 0.3 • The "ring" region around the plasma sheet defi ned by 0.8 < p Y 2 V SE + Z2V SE < 1.2 Ions observed in the plasma sheet (mostly O+) are accelerated in energy range from 100eV to 1000eV by JxB forces known also as "slingshot" effect. But particles in the ring (H+and O+) are accelerated by a completely different mechanism similar to process of acceleration of "polar wind" in the terrestrial magnetosphere. In the last case ions are accelerated by pressure gradients and by the tendency for electrons to escape from the top of the ionosphere creating a charge separation leading to a polarisation electric fi eld.
Barabash Stas
Fedorov Arkady
Ferrier C.
Sauvaud Jean-Andre
Zhang Tian-Ling
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