Periodicities of the number of solar flares for the period 1966–1988 |
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| Authors: | J Xanthakis C Poulakos B Petropoulos |
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| Institution: | (1) Research Center for Astronomy and Applied Mathematics, Academy of Athens, Greece |
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| Abstract: | In the present paper a study is made of the mean monthly number of grouped solar flaresf for the time period 1966–1988. Corresponding dataF were taken from the catalogue published by Coffey (1989). Periodicities of 140, 120, 48, 18, 12, and 11 months as well as shorter periodicities of the order of 6 and 3 months for the solar flares have been found. The emphasis is given as far as it concerns the period of 48 months, i.e., 4 years which is for the first time revealed by the present investigation. |
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