Abstract
THE K indices from thirteen Antarctic magnetic observatories have been used to rank each day of the month according to the degree of activity. Ranking was done in the same manner in which Kp is used to rank the five quiet days internationally, except that each station was ranked individually1. A comparison of locally selected days during the International Geophysical Year with internationally selected days indicates several interesting points. Locally selected quiet days at each station had an average 30 per cent of the days differing from the international quiet days. In general, this large percentage indicates the desirability of using locally selected days when considering diurnal or monthly disturbance behaviour. Fukushima2 has discussed the corollary to this; that is, he shows for Kp = O0 that geomagnetic agitation is present in high latitudes even on quiet days at every local time, but is a maximum around φm = 80° near summer noon.
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