Auroral patches in the vicinity of the plasmapause

Details Auroral patches in the vicinity of the plasmapause Auroral patches in the vicinity of the plasmapause

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977georl...4...37m&link_type=abstract

Geophysical Research Letters, vol. 4, Jan. 1977, p. 37-40. National Research Council of Canada

Physics

6

Auroras, Plasmapause, Satellite Observation, Visual Photometry, Electron Energy, Electrostatic Probes, Geomagnetism, Isis Satellites, Particle Flux Density

Scientific paper

Unusual aurora-like patches have been observed equatorward of the diffuse auroral boundary by the ISIS-2 scanning auroral photometer. These rare features are observed predominantly in the evening sector and appear to corotate with the earth and to have lifetimes longer than two hours. Their occurrence coincides with positive going changes in the horizontal component of the earth's magnetic field (Dst). The patches are evidently excited mainly by electrons of energy somewhat higher than that of particles precipitating into the diffuse aurora. While intensities in the patches fall in the same range as in the 'normal' auroras poleward, total input power in a typical patch (100 MW) is a small fraction (.1%) of that in the auroral oval due to the different areas involved. The position of the patches leads to the conclusion that the particles creating them originate near the plasmapause.

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