Models for quasi-periodic electric fields and associated electron precipitation in the auroral zone

Details Models for quasi-periodic electric fields and associated electron precipitation in the auroral zone Models for quasi-periodic electric fields and associated electron precipitation in the auroral zone

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2489p&link_type=abstract

Journal of Geophysical Research, vol. 83, June 1, 1978, p. 2489-2498.

Physics

1

Auroral Zones, Electric Fields, Electron Precipitation, Auroral Electrojets, Birkeland Currents, Electron Energy, Elliptical Polarization, Extremely Low Radio Frequencies, Flux (Rate), Geomagnetic Micropulsations, Periodic Variations, Plasma Diagnostics, Polar Substorms

Scientific paper

Quasi-periodic electric fields observed in the nighttime auroral oval and in the polar cleft had periods of between 0.5 and 3 s and amplitudes from 2 to 30 mV/m and exhibited left-hand and right-hand elliptical polarization. The events in the auroral oval were associated with substorms and visual auroral activity, and the spectral and polarization properties of the observed fields suggest that they represented the electric components of Pc 1 or Pi 1 micropulsations. One possibility is that the micropulsations result from Birkeland current chopping by an unstable double layer located at an altitude of approximately one earth radius. In this interpretation, the double layer is assumed to accelerate the observed electrons, the electron flux variations being due either to the inherent variations of the double layer or to its interaction with the micropulsations.

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