Variations in brightness of diffuse aurorae at the substorm growth phase

Details Variations in brightness of diffuse aurorae at the substorm growth phase Variations in brightness of diffuse aurorae at the substorm growth phase

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ge%26ae..35..156v&link_type=abstract

Geomagnetism and aeronomy, Vol. 35, p. 156-161

Physics

Background Glow, Variation In The Brightness, Growth Phase Of The Substorm

Scientific paper

Based on photometric observations of auroral disturbances, a regular latitudinal irregularity of variations in brightness of the background airglow at the substorm growth phase is discovered. An increase in the background brightness at the equatorial boundary of diffuse precipitations is observed a few tens of minutes before the beginning of the characteristic drift of the discrete auroral forms toward low latitudes. Poleward of the discrete aurorae, the brightness decreases until a sudden poleward expansion of the auroral luminescence occurs. The background brightness increase followed by its decrease is most contrasting in the region of poleward drift of the discrete forms. The background fading lasts from tens of minutes to an hour and a half.

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