Abstract
Solar flare effects—sudden decreases of atmospherics—at 5 kHz have been observed since 1962 at the Panská Ves observatory. A review of SDA's, observed on the records of the integrated atmospheric noise level, is given for the period of 1962–1969. The occurrence of SDA was almost the same for maximum and medium solar activity. The maximum relative occurrence frequency of SDA with regard to all SID's observed (as high as 22.5 per cent) has been found for medium solar activity. The average relative occurrence frequency of SDA was found to be 11.3 per cent. Several events accompanied by SDA and by other types of SID, but not by SEA (at 27 kHz) were observed. On the other hand, three events were accompanied by SDA (5 kHz) and SEA (27 kHz) only. An attempt is given to explain qualitatively both types of events on the basis of variable propagation conditions.
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