Physics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.3791t&link_type=abstract
Journal of Geophysical Research, vol. 81, Aug. 1, 1976, p. 3791-3802.
Physics
5
Auroral Electrojets, Electric Current, Electric Fields, Field Aligned Currents, Radar Measurement, Electron Precipitation, Evening, Lines Of Force, Phased Arrays, Proton Precipitation, Satellite-Borne Radar
Scientific paper
Data collected with a 398-MHz phased array radar located at Homer, Alaska, and with the Triad satellite in polar orbit are used to examine the spatial relationship of evening radar aurora to the field-aligned currents. Results of an event-by-event comparison of the evening radar aurora to the field-aligned currents show that the evening diffuse radar aurora usually occupies the same geographical region as that of the downward field-aligned current flow, that the downward field-aligned currents in the evening sector are closely associated with the eastward electrojet, and that the upward field-aligned currents in the same time sector are associated with the visual aurora. In addition, the two oppositely directed field-aligned currents are at least partially closed in the ionosphere by a Pedersen current, and the downward field-aligned currents must be carried by precipitating protons and/or upward moving low-energy electrons.
Potemra Thomas A.
Presnell R. I.
Tsunoda Roland T.
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