Drifting holes in the energetic electron flux at geosynchronous orbit following substorm onset

Details Drifting holes in the energetic electron flux at geosynchronous orbit following substorm onset Drifting holes in the energetic electron flux at geosynchronous orbit following substorm onset

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.6541s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A5, May 1, 1992, p. 6541-6548. Research supported by DOE.

Physics

14

Earth Orbital Environments, Electron Clouds, Flux (Rate), High Energy Electrons, Holes, Magnetic Storms, Geomagnetism, Radiation Belts

Scientific paper

The discovery of a new type of substorm-related particle flux at geosynchronous orbit is reported. It is manifested as a decrease in energetic electron flux starting near local magnetic midnight at a time of high-energy particle injection to geosynchronous distance. Unlike 'dropouts', which are observed only in the midnight LT sector, this flux signature drifted eastward, showing the typical energy and LT-dependent time patterns of electron drift. This phenomenon was seen only in electron fluxes above a certain threshold energy and was characterized by a moderate amplitude of flux variation (within a factor of 3). Below the threshold energy the normal substorm-associated increase in electron flux (drifting cloud of accelerated particles) was detected. The phenomenon, called a drifting electron hole, is explained as being a result of adiabatic redistribution of an already existing high-energy electron component recently described by Cayton et al. (1989).

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