Azimuthal displacement of the brightness gradient along auroral arcs in a substorm period

Details Azimuthal displacement of the brightness gradient along auroral arcs in a substorm period Azimuthal displacement of the brightness gradient along auroral arcs in a substorm period

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ge%26ae..24...64v&link_type=abstract

Geomagnetizm i Aeronomiia (ISSN 0016-7940), vol. 24, Jan.-Feb. 1984, p. 64-68. In Russian.

Physics

Auroral Arcs, Azimuth, Brightness, Magnetic Storms, Polar Substorms, Arctic Regions, Geomagnetic Micropulsations, Ground Stations, Time Response, Winter

Scientific paper

A detailed analysis of auroral arcs 5-10 minutes before the explosive substorm phase is carried out on the basis of Iakutiia data for February-March 1969 and 1976. An effect is disclosed which precedes the first manifestation of the main features characterizing the explosive substorm phase by 5-10 minutes, including the first Pi2 pulsation train. A brightening wave front with an asymmetric meridional profile of surface brightness is observed to travel along the low-brightness uniform filamentary zone; the displacement is toward the west in the evening sector and toward the east in the morning sector.

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