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

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

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 mo) have been found. The existence of these periodicities comparing with the early findings is discussed.

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Bibliographische Detailangaben
Veröffentlicht in:Solar physics 1989-01, Vol.123 (2), p.357-365
Hauptverfasser: OZGUC, A, ATAC, T
Format: Artikel
Sprache:eng
Schlagworte:
Astronomy
Earth, ocean, space
Exact sciences and technology
Flares, bursts, and related phenomena
Solar physics
Solar system
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Beschreibung
Zusammenfassung: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 mo) have been found. The existence of these periodicities comparing with the early findings is discussed.
ISSN:0038-0938
1573-093X
DOI:10.1007/BF00149111