Ion and electron dissipation in oblique slow shocks

Details Ion and electron dissipation in oblique slow shocks Ion and electron dissipation in oblique slow shocks

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm23b..02y&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM23B-02

Physics

2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2748 Magnetotail Boundary Layers, 2753 Numerical Modeling, 2764 Plasma Sheet

Scientific paper

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 (Te∥ >Te⊥), 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.

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