Dayside aurorae and their relation to other geophysical phenomena

Details Dayside aurorae and their relation to other geophysical phenomena Dayside aurorae and their relation to other geophysical phenomena

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40..621l&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 5, May 1992, p. 621-639.

Mathematics

Logic

13

Auroral Zones, Interplanetary Magnetic Fields, Luminosity, Polar Cusps, Solar Wind, Daytime, Earth Magnetosphere, Spitsbergen (Norway)

Scientific paper

Results are presented of an investigation of the principal morphological peculiarities of auroral luminosity on the basis of data from multiyear aurora observations in daylight hours at Spitzbergen and Franz Jozef Land. It is shown that in this region the typical forms of auroras are moving poleward rayed arcs appearing at the equatorward boundary of the auroral oval and disappearing at its pole boundary. Discrete forms of auroras are located inside a much broader red luminosity band in its equatorward part. Auroral pulsations with a period of 10-50 s are observed in the prenoon sector in a region of much harder precipitations found more equatorward with respect to the daytime red luminosity band. The peculiarities of daytime aurora dynamics during substorms are also investigated. A scheme of the daytime auroral luminosity distribution is presented. Analytical expressions of the dependence of the daytime aurora position in IMF are provided. Certain physical mechanisms that can explain the peculiarities of daytime aurora dynamics are also discussed.

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