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

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Abstract

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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Authors and Affiliations

  1. Kandilli Observatory, Bogaziçi University, Çengelköy, Istanbul, Turkey

    Atila Özgüç & Tamer Ataç

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  1. Atila Özgüç
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  2. Tamer Ataç
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Özgüç, A., Ataç, T. Periodic behavior of solar flare index during solar cycles 20 and 21. Sol Phys 123, 357–365 (1989). https://doi.org/10.1007/BF00149111

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  • DOI: https://doi.org/10.1007/BF00149111

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