Plasma and field signatures of poleward propagating auroral precipitation observed at the foot of the Geos 2 field line

Details Plasma and field signatures of poleward propagating auroral precipitation observed at the foot of the Geos 2 field line Plasma and field signatures of poleward propagating auroral precipitation observed at the foot of the Geos 2 field line

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.4587s&link_type=abstract

Journal of Geophysical Research, vol. 85, Sept. 1, 1980, p. 4587-4601. Research supported by the Academy of Finland.

Physics

4

Atmospheric Radiation, Auroral Electrojets, Earth Magnetosphere, Geos 2 Satellite, Magnetic Signatures, Rarefied Plasmas, All Sky Photography, Electron Precipitation, Energy Spectra, High Energy Electrons, Ionospheric Propagation

Scientific paper

An analysis of the physical processes occurring on the Kilpisjarvi, (Finland) - Geos 2 field line is attempted by comparing all-sky camera data of the 6300 A auroral emission intensity from the ionosphere and data of particle and wave characteristics deep in the magnetosphere on the same field line. Poleward propagating electron precipitation appears to be an aspect of the auroral substorm phenomenon that occurs regularly with well defined signatures, which are particularly evident in the plasma and field data obtained with the Geos 2 spacecraft. It is shown that the event is marked by a growth phase of the tailward magnetic field component of about one hour duration, corresponding to a northward propagating arc at the ground. At the same time a short-lived electric field enhancement up to 15 mV/m and a burst of ULF waves are perceived. The observed electric field values which are comparable to the inductive electric field expected from the observed magnetic field changes, are believed to be crucial in the processes. It is suggested that these events correspond to injection events which occur at the onset of the locally detected expansion phase.

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