Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43b1492c&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM43B-1492
Physics
2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped, 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
Understanding the loss of relativistic electrons in the Earth's outer radiation belt during geomagnetic storm main phases is of great significance for the development of space weather models. It is known that the possible loss mechanisms include relocation of particles due to changing magnetic configuration, precipitation into the atmosphere due to wave-particle interactions, and the encounters with the magnetopause boundary, so called "magnetopause shadowing". However, no quantitative relationship among the three mechanisms has been established yet. To solve this issue, we will perform a statistical study of the pitch angle resolved electron data from three LANL geosynchronous satellites (data duration ~190 days) and the SCATHA satellite (data duration ~10 years), which covers regions around and outside geosynchronous orbit. By transforming flux into density in phase space the adiabatic effects are removed first to identify the "real" losses. Then by studying the electron pitch angle distributions and locating the outermost closed drift shells, we should be able to differentiate the last two loss mechanisms. A recently developed fitting method is applied to study the pitch angle distribution statistically, and the outmost closed drift shell is traced in empirical magnetic models (e.g., the T01 storm model). This study will produce a statistical model quantitatively describing the loss of relativistic electrons due to each mechanism, as a function of radial position, local time, and storm intensities.
Cayton T.
Chen Yafeng
Friedel Reiner H.
Hartinger Michael
Reeves Geoff D.
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