The 73-day periodicity of the flare index during the current solar cycle 22

Details The 73-day periodicity of the flare index during the current solar cycle 22 The 73-day periodicity of the flare index during the current solar cycle 22

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..150..339o&link_type=abstract

Solar Physics, vol. 150, no. 1-2, p. 339-346

Mathematics

Probability

31

Gamma Ray Astronomy, Gamma Ray Bursts, Light (Visible Radiation), Periodic Variations, Photosphere, Solar Activity, Solar Corona, Solar Cycles, Solar Flares, Solar Protons, Solar X-Rays, Sunspots, X Ray Astronomy, Brightness, Correlation, False Alarms, Fourier Analysis, Fourier Transformation, Power Spectra, Probability Theory, Random Noise, Spectrum Analysis, Time Series Analysis

Scientific paper

The flare index of the current solar cycle 22 is analysed to detect periodicities. Power spectral analysis of the time series of solar flare index data reveals a periodicity around 73 and 53 days. We find that a periodicity of 73 days was in operation from November 1988 to the end of December 1991. We also find that when the 73-day periodicity or the 154-day periodicity is in operation the flare index is well correlated with the relative sunspot numbers.

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