Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm53b0430q&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM53B-0430
Physics
7835 Magnetic Reconnection, 7843 Numerical Simulation Studies, 2700 Magnetospheric Physics, 2724 Magnetopause, Cusp, And Boundary Layers
Scientific paper
Our recent computer simulations have shown that the presence of even a small electron anisotropy can strongly influence both the linear and nonlinear development of reconnection. It is therefore of great importance to determine the evolution of such anisotropies and whether or not they are rapidly reduced by short-wavelength instabilities. Here we re-examine the linear stability of a bi-Maxwellian Harris equilibrium. In particular, we derive approximate analytic expressions for bound tearing-like perturbations, and show that the predicted eigenfunctions and growth rates are in good agreement with those of our linearized Vlasov solver. Limits of propagation parallel and perpendicular to the magnetic field are considered. We also examine the stability of the sheet to three distinct, short-wavelength modes driven unstable by an electron temperature anisotropy: the whistler anisotropy instability, the electron mirror instability and the electron Weibel instability, and discuss their relative importance with emphasis on their roles in isotropizing electrons.
Daughton William
Gary S.
Karimabadi Homa
Quest Kevin
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