The diffusive auroral zone. I - A model of the equatorial boundary of the diffusive zone of auroral electron intrusion in the evening and near mid-day sectors

Details The diffusive auroral zone. I - A model of the equatorial boundary of the diffusive zone of auroral electron intrusion in the evening and near mid-day sectors The diffusive auroral zone. I - A model of the equatorial boundary of the diffusive zone of auroral electron intrusion in the evening and near mid-day sectors

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977kosis..15..421g&link_type=abstract

Kosmicheskie Issledovaniia, vol. 15, May-June 1977, p. 421-434. In Russian.

Physics

4

Atmospheric Models, Auroral Zones, Electron Diffusion, Geomagnetism, Daytime, Kp Index, Night Sky, Plasmapause, Time Response

Scientific paper

The equatorial boundary of the diffusive zone of soft electron intrusion (flux energies of 0.01-0.1 erg/sq cm sec sterad) in the evening and near mid-day sectors is located using data from Franco-Soviet experiments on Oriole 1 and Oriole 2. It is shown that this boundary, observed at ionospheric altitudes, is a projection of the internal boundary of the plasma layer, which almost coincides with the plasmapause during prolonged disturbances. Under conditions of heightened magnetic activity, the position of the diffusive zone of intrusion corresponds to the region with cold plasma concentrations in the equatorial plane of 10-80/cu cm. The characteristic precipitation time in the subauroral zone of soft electrons injected during substorms is about 1000-10,000 sec. A theoretical model for determining the location of the diffusive boundary of intrusion as a function of the Kp index is presented and shown to be in good agreement with observations.

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