On Short-Term Periodicity of the Solar Radius Measurements |
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| Authors: | H Kiliç O Golbasi |
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| Institution: | 1.Akdeniz University,Antalya,Turkey;2.Istanbul Kultur University,Istanbul,Turkey |
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| Abstract: | The aim of the present study is to investigate the short-term periodicity in the solar radius measurements and to compare
with the short periods in sunspot numbers, sunspot areas and flare index data. The spectral analysis of data sets covering
a time interval from 26 February 2000 to 26 October 2007 during Solar Cycle 23 were made by using the Date Compensated Discrete
Fourier Transform (DCDFT). The power spectrum of solar radius data corrected for the seeing effect gives an evident peak at
25.7 days with the amplitude of 0.034 arcsec, which is slightly different from the peaks of 26.2 and 26.7 days produced by
sunspot numbers and sunspot areas data, respectively. Besides, the main peak of 25.7 days detected in the power spectrum of
solar radius data is in agreement with the period of 25.5 days, suggested to be the fundamental period of the Sun by Bai and
Sturrock (in Nature
350, 141, 1991). |
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