Abstract
Summary. The frequency of occurrence of the positive Dst for each UT hour has been computed using data for the years 1957–77. For all hours the seasonal variation shows a peak in June. The annual variation conforms with the Malin-Isikara mechanism. While the annual component of Dst+ exhibits a significant UT dependence which cannot be explained by the McIntosh effect, the semi-annual component has a relatively smaller significant time dependence. The diurnal component of Dst+ has a pronounced annual variation with a June maximum. The results presented here are compared and discussed in the light of an earlier analysis of Dst by Mayaud.
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