Examining EMIC Waves Observed at Geosynchronous Orbit During Storms, Directly and as Inferred From the Plasma Population

Details Examining EMIC Waves Observed at Geosynchronous Orbit During Storms, Directly and as Inferred From the Plasma Population Examining EMIC Waves Observed at Geosynchronous Orbit During Storms, Directly and as Inferred From the Plasma Population

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm21a1673b&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM21A-1673

Statistics

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2764 Plasma Sheet, 2772 Plasma Waves And Instabilities (2471), 2774 Radiation Belts, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

There is still much to be understood about the processes contributing to relativistic electron enhancements and losses in the radiation belts. Wave particle interactions with both whistler and electromagnetic ion cyclotron (EMIC) waves may precipitate or accelerate these electrons. In this study we examine the link between EMIC waves and resulting relativistic electron flux levels after geomagnetic storms. Using LANL MPA plasma data from geosynchronous orbit, in conjunction with linear theory, we develop a proxy for EMIC wave growth. In a statistical study using superposed epoch analysis, we find that for storms resulting in net relativistic electron losses, there is a greater occurrence of EMIC mode waves at higher growth rates. This is consistent with the belief that EMIC waves are a primary mechanism for scattering of relativistic electrons, and thus cause losses of such particles. We use the proxy to examine the likely presence of these waves as functions of both local time and storm epoch time and compare our inferred wave characteristics to in situ wave measurements from high-resolution GOES magnetometer data. Through this comparison, we can quantify the correlation between our EMIC wave growth proxy and direct wave measurements, both measured at geosynchronous orbit. This result enables broader understanding of the powerful applications of using plasma data to infer wave distributions in space.

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