Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm33a..04j&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SM33A-04
Physics
2736 Magnetosphere/Ionosphere Interactions (2431), 2768 Plasmasphere, 2774 Radiation Belts, 7984 Space Radiation Environment
Scientific paper
Microbursts, or short duration bursts of precipitating relativistic electrons observed at low altitudes, are associated with whistler-mode chorus and have been proposed as one of the primary mechanisms for storm- time depletion of the outer radiation belt. Whistler chorus in turn occurs outside the plasmapause. We use low-altitude identifications of the plasmapause from DMSP and microburst observations from SAMPEX to investigate the correlation between plasmapause and microburst locations. Examination of an 82-day period in 2001 shows microbursts move radially inward during storm-time in concert with plasmapause movement, with microbursts consistently located outside the plasmapause. In a superposed epoch analysis of seven moderate storms, microbursts occur near storm peak at a given L-value within hours of erosion of the plasmapause at that location. These observations support association of microbursts with chorus and the suggestion that microbursts contribute significantly to storm-time radiation belt depletion.
Anderson Philip C.
Johnston Robert W.
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