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Solar cycle effects on geomagnetic Pi 2 pulsations

1968; American Geophysical Union; Volume: 73; Issue: 1 Linguagem: Francês

10.1029/ja073i001p00267

2156-2202

Takao Saito, Satoki Matsushita,

Geomagnetism and Paleomagnetism Studies

Journal of Geophysical Research (1896-1977)Volume 73, Issue 1 p. 267-286 Solar cycle effects on geomagnetic Pi 2 pulsations Takao Saito, Takao SaitoSearch for more papers by this authorS. Matsushita, S. MatsushitaSearch for more papers by this author Takao Saito, Takao SaitoSearch for more papers by this authorS. Matsushita, S. MatsushitaSearch for more papers by this author First published: 1 January 1968 https://doi.org/10.1029/JA073i001p00267Citations: 86AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Rapid-run magnetograms of more than 6000 Pi 2 events generally associated with bay disturbances observed at Onagawa, Japan, and Fredericksburg, Virginia, during the years from 1956 through 1966 were analyzed to search for solar cycle effects. Yearly occurrence frequency of the Pi 2's including not only large amplitudes but also medium and small ones showed an inverse relation with solar activity. The local time of the maximum occurrence of Pi 2 changed from year to year between 22 h and 01 h LT. The daily occurrence frequency of Pi 2 seemed to have a systematic recurrence tendency caused by the solar rotation. The Pi 2 period decreased from 1957 to 1960 and increased from 1962 to 1965, depending on the magnitude of the accompanying bay disturbance. 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