Ring Current Ion Losses by Pitch Angle Scattering

Details Ring Current Ion Losses by Pitch Angle Scattering Ring Current Ion Losses by Pitch Angle Scattering

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51c..04w&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM51C-04

Physics

2716 Energetic Particles, Precipitating, 2778 Ring Current, 2788 Storms And Substorms

Scientific paper

The Source/Loss Cone Energetic Particle Spectrometer (SEPS) on the Polar Satellite observes ions above 155 keV with an angular resolution of about 1.5 degrees. When the axis of SEPS is pointing within 10 degrees of the magnetic field direction, the detector measures particles in both the downward and upward loss cones. Measurements of the loss cone fluxes during the magnetic storms of August 6, 1998, August 27, 1998, September 25, 1998, October 19, 1998, and November 13, 1998 often show large fluxes of ring current ions moving downward inside the loss cone. At times these fluxes are comparable to the trapped ion population, indicating that strong pitch angle scattering is taking place at least locally. Although Polar encounters the ring current region at only two magnetic local times during any given storm, the frequent observation of precipitation suggests that pitch angle scattering is an important loss mechanism for ring current ions.

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