Statistical Study of the Relativistic Electron Enhancement Rise Times as Measured by the GPS Energetic Instrument Constellation

Details Statistical Study of the Relativistic Electron Enhancement Rise Times as Measured by the GPS Energetic Instrument Constellation Statistical Study of the Relativistic Electron Enhancement Rise Times as Measured by the GPS Energetic Instrument Constellation

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43b1497v&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM43B-1497

Physics

2720 Energetic Particles: Trapped, 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

Intense relativistic electron enhancements in the Earth's radiation belts are observed during periods of enhanced geomagnetic activity. Different physical processes- identified as being responsible for these enhancements- would lead to different characteristic rise times of the electron fluxes. Recent studies have shown that local acceleration driven by whistler-mode chorus waves can lead to a fast increase of electron fluxes in a time period of 1 to 2 days just outside the plasmapause, while enhanced storm time radial diffusion leads to a slower enhancement of the fluxes in that region. The GPS orbit offers a great opportunity to study the dynamics of the Earth's electron radiation belts. Energetic electron data are obtained for L>4, the region in the heart of the radiation belts. For this study we have available data from 2001 from the BDD-IIR instrument on board ns41 satellite and the CXD instrument on board 6 satellites. We use this data to evaluate relativistic electron enhancement rise times and compare them to the corresponding rise times at geosynchronous orbit using the LANL geosynchronous satellite data. We also investigate the solar wind and magnetosphere conditions that are related to the different flux rise profiles and identify the physical processes responsible for the different values of rise times.

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