IMPULSES OF SOLAR ACTIVITY

摘要

We study the development of complexes of activity during the course of four cycles with the smallest activity (Nos. 13 - 16), for which we have the daily sums of sunspot areas separately for the northern and southern hemisphere. The solar activity is characterised by isolated, suddenly appearing increases, often regularly repeated in one, or simultaneously in both hemispheres. We refer to such sudden increases as "impulses of solar activity", which we can observe throughout the whole activity cycle, but best during periods of lower activity. We discuss the main characteristics of these impulses: the occurrence frequency, number, duration, etc. We draw attention to some regularities in their repetition.