Calculating Wave Power from the Source Particle Distributions for EMIC Waves

Details Calculating Wave Power from the Source Particle Distributions for EMIC Waves Calculating Wave Power from the Source Particle Distributions for EMIC Waves

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11b1722b&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11B-1722

Physics

[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts

Scientific paper

Wave particle interactions are fundamental to the dynamics of outer radiation belt electrons. Both whistler mode and electromagnetic ion cyclotron (EMIC) waves can have resonant interactions with these high energy electrons, leading to their pitch angle diffusion as well as energy diffusion. Using LANL Magnetospheric Plasma Analyzer (MPA) data from geosynchronous orbit, in conjunction with linear theory, we develop a proxy for enhanced EMIC wave growth. From this plasma-based proxy, we can calculate a wave power for the inferred EMIC waves. We use this calculation to examine the likely presence and growth of these waves as functions of both local time and magnetic storm epoch time, and we compare our inferred wave characteristics to direct measurements of the waves. This result enables broader understanding of the powerful applications of using plasma data to infer wave distributions in space, and understanding the source populations and growth mechanisms for EMIC waves.

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