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The periodicities in the occurrence rate of whistlers observed at Moshiri (geomag.lat.:35'N; L=1.6) have been investigated. The short periods of the order of hours have been studied by means of the cepstrum analysis for the continuous recording data, and it is found that there are a major peak just below 2 hours and a minor peak at about 4 hours. These periods are interpreted in terms of the cyclic formation of whistler ducts. Then, the long period of the order of days have been examined bydoi:10.1541/jae.11.23 fatcat:absdk67csvb7tnt56krxkooyrq