The Distributions of Ring Current Instabilities at GEO

Details The Distributions of Ring Current Instabilities at GEO The Distributions of Ring Current Instabilities at GEO

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm41b2021m&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM41B-2021

Physics

[2752] Magnetospheric Physics / Mhd Waves And Instabilities

Scientific paper

The Alfven-cyclotron instability which leads to EMIC waves and the proton Bernstein mode instability which generates magnetosonic waves have important geophysical consequences. Geosynchronous observations from Los Alamos plasma instruments and the RAM-SCB self-consistent inner magnetosphere model are used to gain insight into the ion velocity distributions which drive such waves. Storm-time MPA observations are analyzed to establish the parameters and local times of ion velocity distributions exhibiting temperature anisotropies and velocity-ring characteristics. We will compare the observations to the RAM-SCB model results for individual events and also establish the statistical pattern of the unstable distributions as a function of activity. This work will lead into using hybrid and PIC codes to generate enhanced field fluctuations and determine how ions are scattered, and test-particle computations to calculate how such fields pitch-angle scatter and accelerate fast electrons.

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