HR: 1330h
AN: SM23B-02    [Abstracts]
TI: Ion and electron dissipation in oblique slow shocks
AU: * Yin, L
EM: lyin@lanl.gov
AF: Los Alamos National Laboratory, Mail Stop B259, Los Alamos, NM 87545 United States
AU: Winske, D
EM: winske@lanl.gov
AF: Los Alamos National Laboratory, Mail Stop B259, Los Alamos, NM 87545 United States
AU: Daughton, W
EM:
AF: University of Iowa, 511 VAN, Department of Physics and Astronomy, Iowa City, IA 52242 United States
AU: Coroniti, F V
EM:
AF: UCLA, 405 Hilgard Ave., Department of Physics and Astronomy, Los Angeles, CA 90095 United States
AB: Ion and electron dissipation in collisionless slow-mode shocks at highly oblique shock angles (>80°) are examined using one-dimensional hybrid (kinetic ions, massless fluid electrons)and full particle (kinetic ions and electrons) simulations. In the hybrid code, an improved full electron pressure tensor model is used to enable the formation of highly oblique slow shocks in which effects of the downstream electron temperature anisotropy with respect to the local magnetic field direction (T^e∥ >T^e⊥), as seen in spacecraft observations and full particle simulations, are retained. Unlike the slow shocks at moderately oblique angles (<80°) in which the shock dissipation is provided primarily by the ions, additional electron physics is needed to set up shocks at very oblique angles: The electron temperature anisotropy results from both the large mirror effects and the electron acceleration/heating by the parallel electric field of very obliquely propagating kinetic Alfvén waves excited by ion-ion streaming in the shock. The additional electron dynamics lead to spiky structures in the shock ramp in the density, and the ion and electron parallel temperature/pressure. We present simulations of very oblique slow shocks and discuss both the single particle effects and contributions from resonant waves to the shock dissipation.
DE: 2740 Magnetospheric configuration and dynamics
DE: 2744 Magnetotail
DE: 2748 Magnetotail boundary layers
DE: 2753 Numerical modeling
DE: 2764 Plasma sheet
SC: SPA-Magnetospheric Physics [SM]
MN: 2005 Joint Assembly