Two-dimensional hybrid simulation of the growth, effects, and distribution of magnetospheric electromagnetic ion cyclotron waves

Details Two-dimensional hybrid simulation of the growth, effects, and distribution of magnetospheric electromagnetic ion cyclotron waves Two-dimensional hybrid simulation of the growth, effects, and distribution of magnetospheric electromagnetic ion cyclotron waves

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm21d..03d&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM21D-03

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Computation

[0560] Computational Geophysics / Numerical Solutions, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2772] Magnetospheric Physics / Plasma Waves And Instabilities

Scientific paper

Pitch-angle scattering by electromagnetic ion cyclotron (EMIC) waves has been proposed as a major loss mechanism for relativistic electrons in the radiation belts, and is thought to result in very high loss rates during the main phase of geomagnetic storms. Here, we use a two dimensional self-consistent nonlinear hybrid simulation code (particle ions and fluid electrons) in dipole geometry to examine the growth, polarization, propagation, and effects of magnetospheric EMIC waves generated by anisotropic (T⊥ > T//) ring current protons. The initial state satisfies anisotropic MHD force balance, and includes plasmaspheric ions, H+, He+, and O+. We examine the heating of O+ ions, and the behavior of the waves in the vicinity of a plasmapause. Initial results indicate that O+ at high altitude can be heated to keV temperatures and that the waves are not preferentially produced within the plasmapause. We outline a method to determine the quasi-steady-state spatial distribution of the waves. Results to date will be presented.

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