HR: 08:45h
AN: SM11B-04    [PDF]
TI: Localized and Continuous Nature of the Ionospheric Plasma Cloud Ejection: Solar Wind-Venus Global Hybrid Simulation Perspective.
AU: * Terada, N
EM: teradan@stelab.nagoya-u.ac.jp
AF: Solar-Terrestrial Environment Laboratory, Nagoya University, Honohara 3-13, Toyokawa, Aichi, 442-8507 Japan
AU: Shinagawa, H
EM: sinagawa@stelab.nagoya-u.ac.jp
AF: Solar-Terrestrial Environment Laboratory, Nagoya University, Honohara 3-13, Toyokawa, Aichi, 442-8507 Japan
AU: Machida, S
EM: machida@kugi.kyoto-u.ac.jp
AF: Department of Geophysics, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502 Japan
AB: Plasma cloud ejection, the signatures of which were often detected just above the Venusian ionopause by the Pioneer Venus Orbiter, is investigated using a comprehensive global hybrid (particle ion/massless fluid electron) simulation model of the solar wind-Venus interaction with a planetary ionosphere included. The model reveals that the ejection region of plasma clouds is not smoothly distributed as that is expected from previous local simulations of the Kelvin-Helmholtz (K-H) instability, but instead is rather localized and travels tailward as time goes on. The tailward traveling of the ejection region is accompanied by the co-moving of the background field structure, and the ejected clouds carry farther away from the ionopause than those in the local K-H simulation. These results suggest that the ejection may not be controlled by the local Kelvin-Helmholtz process but affected by the other processes related to the global stream around the planet.
DE: 2459 Planetary ionospheres (5435, 5729, 6026, 6027, 6028)
DE: 2752 MHD waves and instabilities
DE: 2753 Numerical modeling
DE: 2756 Planetary magnetospheres (5443, 5737, 6030)
DE: 6295 Venus
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting