Abstract
We have analysed intermediate-term periodicities in the green corona by dividing 10° latitudinal belts for the solar cycles 18, 19, and 20 (1947–1976). Discrete Fourier transform technique was used and three noticeable periodicities (3.48, 2.57, and 2.27 years) were found. The physical origin of these periods is not known, but evidence in our results exclude the possibility that the observed periods are a harmonic due to the method of analyse. The period of 3.48-year is the strongest one. 17.6-month periodicity was found only on around +40° belt while 155-day periodicity was not found in our analysis.
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Özgüç, A. Intermediate-term periodicities in the green corona brightness of the Sun. Astrophys Space Sci 187, 197–207 (1992). https://doi.org/10.1007/BF00643389
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DOI: https://doi.org/10.1007/BF00643389