Electric Field measurements associated with energetic particle acceleration in the inner magnetosphere

Details Electric Field measurements associated with energetic particle acceleration in the inner magnetosphere Electric Field measurements associated with energetic particle acceleration in the inner magnetosphere

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm23c..04w&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM23C-04

Physics

[2712] Magnetospheric Physics / Electric Fields, [2774] Magnetospheric Physics / Radiation Belts, [2788] Magnetospheric Physics / Magnetic Storms And Substorms

Scientific paper

This talk presents results from the CRRES and Polar spacecraft of measurements of electric fields in association with particle acceleration in the inner magnetosphere with a special emphasis on especially strong geomagnetic storms and substorms. Some of these acceleration mechanisms include substorm injections event which can accelerate electrons to near relativistic energies and are associated with enhancements in the electric field of 1-30 mV/m for several minutes. Enhancements in the large scale convection electric field during major storms of 4-7 mV/m for ~hours can inject and energize ring current electrons and ions and strongly deform the plasmasphere. Both stochastic and coherent (trapped) radial transport associated with ULF waves driven either by the solar wind or internal magnetospheric free energy sources may also accelerate particles to high energy. In recent years, evidence has accumulated for the importance of whistler waves in the quasi-linear and coherent scattering and acceleration of particles. There is now evidence that whistler mode waves and lower hybrid waves can occur with much larger amplitudes >250 mV/m) than previously thought. Outstanding questions associated with the structure and dynamics of these fields and the acceleration process will be highlighted, as well as, the capabilities of the RBSP mission in addressing them.

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