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Solar Physics

, Volume 237, Issue 2, pp 433–444 | Cite as

Periodicities in Irradiance and in other Solar Activity Indices During Cycle 23

  • T. AtaçEmail author
  • A. Özgüç
  • J. Rybak
Article

Abstract

Magnetic fields give rise to distinctive features in different solar atmospheric regimes. To study this, time variations of the flare index, sunspot number and sunspot area, each index arising from different physical conditions, were compared with the solar composite irradiance throughout cycle 23. Rieger-type periodicities in these time series were calculated using Fourier and wavelet transforms (WTs). The peaks of the wavelet power of these periodicities appeared between the years 1999 and 2002. We found that the solar irradiance oscillations are less significant than those in the other indices during this cycle. The irradiance shows non-periodic fluctuations during this time interval. The peaks of the flare index, sunspot number and sunspot total area were seen around 2000.4, 1999.9 and 2001.0, respectively. These periodicities appeared intermittently and were not simultaneous in different solar activity indices during the three years of the maximum phase of solar cycle 23.

Keywords

Solar Activity Solar Cycle Sunspot Number Sunspot Area Solar Total Irradiance 
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

© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  1. 1.Kandilli Observatory and E.R.IBoğaziçi UniversityIstanbulTurkey
  2. 2.Astronomical InstituteSlovak Academy of SciencesTatranska LomnicaSlovak Republic

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