Relationship Between the Plasmapause and the Outer Radiation Belt From DMSP, IMAGE, and SAMPEX Observations

Details Relationship Between the Plasmapause and the Outer Radiation Belt From DMSP, IMAGE, and SAMPEX Observations Relationship Between the Plasmapause and the Outer Radiation Belt From DMSP, IMAGE, and SAMPEX Observations

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43b1491j&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM43B-1491

Other

2431 Ionosphere/Magnetosphere Interactions (2736), 2768 Plasmasphere, 2774 Radiation Belts

Scientific paper

The plasmapause separates cold dense plasma in the inner magnetosphere from hot, low-density plasmasheet plasma. This boundary, typically at L=4-6, tends to show a duskside bulge but is also very dynamic in response to changes in magnetospheric convection and other stormtime phenomena. The outer radiation belt is likewise dynamic during stormtime, in terms of both radial location and energetic particle population. It has been proposed that outer radiation belt particles are variously depleted and energized due to wave-particle interactions associated with the plasmapause location. This may be tested by simultaneous observations of energetic particles and the plasmapause location. SAMPEX observations of radiation belt particles may be compared with plasmapause observations from IMAGE, but these provide limited temporal coverage. We use data from DMSP satellites to identify the plasmapause signature in the ionosphere (specifically the light ion trough) to provide more continuous plasmapause observations. We report on comparisons of these DMSP-derived plasmapause locations to IMAGE-based observations as well as SAMPEX observations of outer radiation belt dynamics and precipitating particle microbursts.

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