Effects of Precipitation on the Loss of Radiation Belt Relativistic Electrons

Details Effects of Precipitation on the Loss of Radiation Belt Relativistic Electrons Effects of Precipitation on the Loss of Radiation Belt Relativistic Electrons

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm21b..07c&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM21B-07

Physics

[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2720] Magnetospheric Physics / Energetic Particles: Trapped, [2774] Magnetospheric Physics / Radiation Belts, [7999] Space Weather / General Or Miscellaneous

Scientific paper

Understanding the physical processes controlling relativistic electron dynamics—acceleration, loss and transport—in the Earth’s radiation belts is the prerequisite for development of space weather forecast models. Specifically, regarding the loss of relativisitic electrons, several mechanisms have been proposed which include the precipitation caused by wave-particle interactions, the outward diffusion associated with magnetopause shadowing, and detrapping from magnetic field lines due to the breakdown of adiabatic conditions. However, it is still undetermined which of those plays the dominant role and where and when. Here we focus on the effects of precipitation by analyzing in-situ multi-point observations from several satellite missions. Both case and statistical studies will be preformed on electron observations from two groups of satellites: One includes GPS, LANL GEO, Polar, and THEMIS that measure the trapped electron population at different L-shells from high altitude; the other is SAMPEX and NOAA POES that measure precipitating electrons from low altitude at several local times. By comparing the decay rate of trapped electrons observed at high altitude to the precipitation rates observed at low altitude, we expect to quantitatively determine the effects of precipitation on the loss of relativistic electrons, especially for the portion of the radiation belts with L>4.

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