Abstract
The diurnal, magnetic and solar cycle dependence of discrete auroral occurrence and intensities of emissions at 3914, 5577 and 6300 Å over Antarctica in 1959 and 1963 are discussed and illustrated with maps of average intensities for latitudes greater than 50°. Two types of discrete visual aurora are described: the night-peak discrete aurora, closely associated with polar magnetic substorms and showing positional but little intensity change with the solar cycle; and the day-peak discrete aurora, a weak rayed form in the morning in quiet conditions. Non-visual emissions of importance are: the mantle aurora, which is closely associated with the polar magnetic substorm and is the main source of auroral emission at solar maximum, but becomes of less importance at solar minimum; and the 6300 Å emission which has a polar cap enhancement that is pronounced in 1959 but is only weakly evident in 1963.
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