HR: 1340h
AN: SM43A-1137    [Abstracts]
TI: Bow Shock-Magnetosphere coupling under different IMF conditions
AU: * Blanco-Cano, X
EM: xbc@geofisica.unam.mx
AF: Instituto de Geofisica, UNAM, Ciudad Universitaria, Coyoacan, Mexico, DF 04510 Mexico
AU: Omidi, N
EM: omidi@ece.ucsd.edu
AF: Dept. Elec. Comp. Eng., UCSD, MC 0407 , La Jolla, CA 92093-0213 United States
AU: Russell, C
EM: ctrussell@igpp.ucla.edu
AF: IGPP, UCLA, 405 Hilgard Ave , Los Angeles, CA 90095 United States
AB: We perform global hybrid (kinetic ions, fluid electrons) simulations to study the solar wind interaction with a magnetic dipole under a variety of interplanetary magnetic field (IMF) conditions. The advantage of the hybrid code over fluid codes is that it treats ionscale microphysics in the context of the global interaction. We investigate the macrostructure of the bow shock, its dependence on foreshock upstream waves, its influence on the magnetosheath, and its coupling to the outer magnetosphere. The nature of the shock-magnetosheath-magnetosphere coupling is expected to be tied to the direction of IMF for a number of reasons. When the IMF is radial, the quasi-parallel shock and ion foreshock are upstream of the dayside magnetopause while during highly northward or southward IMF the quasi-parallel portion of the shock falls on the flanks and the dayside magnetopause is exposed to the quasi-perpendicular magnetosheath. The magnetosheath is permeated by a variety of waves that result from the convection of upstream waves and also from local generation. Wave characteristics are different at the quasi-parallel and quasi-perpendicular parts of the magnetosheath. We study the influence that magnetosheath waves have on the outer magnetopause, and on processes taking place there such as reconnection.
DE: 2154 Planetary bow shocks
DE: 2159 Plasma waves and turbulence
DE: 2728 Magnetosheath
DE: 2772 Plasma waves and instabilities
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting