Characteristics of polar cap aurora.

Details Characteristics of polar cap aurora. Characteristics of polar cap aurora.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jatp...58.1885a&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, Vol. 58, No. 16, p. 1885 - 1894

Physics

2

Aurorae: Structure

Scientific paper

The characteristics of extremely high-latitude dayside auroras are examined by using auroral TV data obtained at Godhavn, Greenland, and simultaneous DMSP particle data. Two different kinds of aurora are found near the pre-noon sector, namely (1) the polar arc: this aurora is observed during quiet periods and originates from the dayside region. It is related to about 100 eV electron precipitation or less, and (2) the polar corona: this aurora is observed during disturbed periods and the appearance latitude of this aurora is confined within a certain region about 70-80° MLAT. It is related to a few hundred eV electrons. These results suggest that the origin of the polar arc seems to be the plasma mantle or low-latitude boundary layer, and the origin of the polar corona seems to be the low-latitude boundary layer or boundary plasma sheet.

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