Simultaneous acceleration and pitch angle scattering of field-aligned electrons observed by the LEPA on CRRES

Details Simultaneous acceleration and pitch angle scattering of field-aligned electrons observed by the LEPA on CRRES Simultaneous acceleration and pitch angle scattering of field-aligned electrons observed by the LEPA on CRRES

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1416a&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A12, pp. SMP 1-1, CiteID 1416, DOI 10.1029/2001JA005090

Physics

1

Magnetospheric Physics: Magnetosphere-Inner, Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Energetic Particles, Precipitating, Trapped, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions

Scientific paper

Using data from the Low Energy Plasma Analyzer we present detailed pitch angle versus energy electron distributions at the time of field-aligned electron events. We present three case studies, as well as the findings of a larger survey of 158 events. These distributions show that electrons are apparently scattered in pitch angle out of field-aligned electron beams observed around 0.1-1 keV. Generally, this pitch angle scattering is accompanied by simultaneous acceleration. As electrons are scattered from the field-aligned beam to pitch angles of ~60°, they typically increase to energies of around 10 keV. The electrons are then seen to scatter to 90° pitch angle with no further change in energy. The observations suggest that this scattering and acceleration takes place near the geomagnetic equator and over a limited range of latitudes.

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