Diurnal radio aurora variations at 50 MHz measured by the Bistatic Auroral Radar System radars

Details Diurnal radio aurora variations at 50 MHz measured by the Bistatic Auroral Radar System radars Diurnal radio aurora variations at 50 MHz measured by the Bistatic Auroral Radar System radars

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.8651a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Aug. 1, 1988, p. 8651-8661. NSERC-supported research.

Mathematics

Logic

17

Diurnal Variations, Doppler Effect, Doppler Radar, Ionospheric Currents, Radar Measurement, Radio Auroras, Backscattering, Earth Magnetosphere, Morphology

Scientific paper

The Bistatic Auroral Radar System (BARS), which is a part of the Canopus program, was employed to measure typical morphological characteristics and diurnal variations in the backscatter. Mean Doppler velocity and intensity data, obtained from the normal operating mode of the BARS radars for selected intervals between March 1986 and July 1987, were used. The Canopus magnetometers at Gillam and Eskimo Point were used to obtain the equivalent current system. Three basic time intervals were identified by BARS radars: (1) an evening interval between 2100 and 0200 UT with westward E x B drift, which occurs only under disturbed conditions, (2) a breakuup interval, dominated by eastward drift but including westward turnings, which occurs even under relatively quiet conditions, and (3) an interval with oscillations around a mainly eastward drift. It is shown that the Hall current pattern interpreted as the equivalent current system derived from the Canopus magnetometers is in good agreement with the electron Hall drift pattern inferred from the measured (Doppler) phase velocities.

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