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Solar Physics

, Volume 123, Issue 2, pp 357–365 | Cite as

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

  • Atila Özgüç
  • Tamer Ataç
Article

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.

Keywords

Fourier Fourier Transform Flare Solar Activity Solar Cycle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Atila Özgüç
    • 1
  • Tamer Ataç
    • 1
  1. 1.Kandilli Observatory, Bogaziçi UniversityÇengelköy, IstanbulTurkey

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