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A statistical analysis has been made of the incidence of auroral radioabsorption events at South Pole, and of its dependence on basic geophysicalparameters such as season, time of day, and magnetic activity level. It isfound that at low and moderate levels of activity the incidence of events inthe winter season is at least twice that in the summer. However, at highactivity no events at all occurred during the local summer night, whichappears to be explicable as the effect of the magnetotail and the consequentdistortion of the magnetosphere when the southern polar region is tiltedstrongly towards the Sun. Previous results from even higher latitudes showthe effect in an even more exaggerated form, in that both the day and nightperiods of absorption activity exhibit strong seasonal variations

Seasonal variations in the incidence of auroral radio absorption events at very high latitude, and the influence of the magnetotail