Storm Time EMIC Waves and Their Relationship to Plasmaspheric Density, Plasma Plumes and Radiation Belt Particle Loss

Details Storm Time EMIC Waves and Their Relationship to Plasmaspheric Density, Plasma Plumes and Radiation Belt Particle Loss Storm Time EMIC Waves and Their Relationship to Plasmaspheric Density, Plasma Plumes and Radiation Belt Particle Loss

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13b2067h&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM13B-2067

Physics

Plasma Physics

[2768] Magnetospheric Physics / Plasmasphere, [2774] Magnetospheric Physics / Radiation Belts, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Electromagnetic ion cyclotron (EMIC) waves have been observed to have a higher occurrence rate during geomagnetic storms than during quiet magnetospheric conditions and are thought to contribute to the loss processes of the ring current and radiation belts. In particular, CRRES EMIC wave activity shows a maximum occurrence rate during the storm main phase, when the storm time ring current particle injection is most likely to over lap with the plasmasphere and plasmaspheric plumes. In this study we will report on the relationship between the plasmasphere, plasmaspheric plumes and the occurrence of EMIC waves seen during the storm main and recovery phases. We will also look at the pitch angle diffusion coefficients found for EMIC waves occurring during the main and recovery phases of a geomagnetic storm. The EMIC wave dataset used in this study comes from the CRRES mission that includes over 900 EMIC wave events and over 100 geomagnetic storms over 1990-1991. By comparing the like phases between storms we are able to improve our understanding of the magnetospheric and plasma conditions that are observed in association with EMIC waves, and how these relate to loss processes in the radiation belts.

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