Aurora and airglow intensity variations with time and magnetic activity at southern high latitudes

Physics

Scientific paper

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Scientific paper

A classification of non-visual types of aurora is considered. The diurnal and seasonal variations and magnetic dependence of the intensities of the 6300, 5577 and 3914 Å emissions between auroral latitudes 50° and 90° at the time of sunspot maximum are presented. The principal source of this night sky emission is a widespread glow or "mantle" aurora, discrete auroral forms contributing only a minor fraction to the totalE The intensity distributions of "mantle" aurora over the polar regions are quite different from the distributions and occurrence of discrete visual auroral forms. When diurnal variations are taken into account, the concept of the auroral and inner auroral zone has to be reconsidered. There is a permanent enhancement of 6300 Å emission in the region of the south auroral pole.

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