Plasma Wave Dynamics in the Inner Magnetosphere in Response to High-Speed Streams

Details Plasma Wave Dynamics in the Inner Magnetosphere in Response to High-Speed Streams Plasma Wave Dynamics in the Inner Magnetosphere in Response to High-Speed Streams

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm21c..03j&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM21C-03

Physics

[2753] Magnetospheric Physics / Numerical Modeling, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts, [2778] Magnetospheric Physics / Ring Current

Scientific paper

Plasma waves play a fundamental role in the energization and loss of charged particles in the inner magnetosphere. The free energy for these waves is supplied from the anisotropic ring current ion and electron velocity distributions. We investigate the conditions under which two dominant magnetospheric plasma waves, whistler mode chorus emissions and electromagnetic ion cyclotron (EMIC) waves develop during high-speed solar wind stream (HSS) passages by Earth. We use our kinetic ring current-atmosphere interactions model with self-consistent magnetic field (RAM-SCB) recently updated to include electron dynamics in non-dipolar magnetic field geometry. To study the statistical behavior of the waves, the plasma boundary conditions of RAM-SCB are specified from superposed epoch analysis of LANL data measured at geosynchronous orbit for HSS passages between January 2005 and 2008. Similarly, the Weimer electric field model used in the RAM-SCB simulations is driven by solar wind data from superposed epoch analysis of these HSS interfaces. We calculate the pitch angle anisotropy of ring current ions and electrons and identify equatorial regions for potential growth of EMIC or whistler mode chorus waves. The modeling results are compared with statistical patterns of plasma wave observations from CRRES satellite.

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