Periodic behavior of solar flare index during solar cycles 20 and 21

Details Periodic behavior of solar flare index during solar cycles 20 and 21 Periodic behavior of solar flare index during solar cycles 20 and 21

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..123..357o&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 123, no. 2, 1989, p. 357-365.

Physics

38

Periodic Variations, Solar Cycles, Solar Flares, Faculae, Solar Activity, Sunspot Cycle

Scientific paper

Short-term periodicities of solar activity were studied with the flare
index by using Discrete Fourier Transform for the time interval
1966-1986. Two noticeable periodicities (18.5 and 5 months) have been
found. The existence of these periodicities comparing with the early
findings is discussed.

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