Electron precipitation in a non-uniform glow aurora

Details Electron precipitation in a non-uniform glow aurora Electron precipitation in a non-uniform glow aurora

Jul 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974p%26ss...22.1067c&link_type=abstract

Planetary and Space Science, Volume 22, Issue 7, p. 1067-1074.

Physics

Scientific paper

Electron intensities at 5 keV >18 keV and >45 keV, were measured on a Petrel rocket flown from Kiruna, Sweden, into a non-uniform glow aurora during the recovery phase of a magnetic bay. The intensities depend on pitch-angle in a way that is consistent with the precipitation being caused by pitch-angle diffusion from reservoirs of geomagnetically-trapped electrons. The scattering process that causes pitch-angle diffusion, and leads to three regions of relatively high intensity, appears to have properties different from the scattering process that leads to two intervening regions of low intensity. A spatial structure in electron reservoir intensity, is attributed mainly to variations in the rate of erosion by pitch-angle diffusion of an initially nearly-uniform reservoir intensity. An expression is derived for the minimum lifetime of trapped electrons undergoing strong pitch-angle diffusion.

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