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

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..152..318o&link_type=abstract

Solar Physics, Volume 152, Issue 1, pp.318-318

Physics

Scientific paper

The flare index of the current solar cycle 22 is analysed to detect intermediate-term periodicities from Sep. 1, 1986 to Dec. 31, 1991. 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 1988 November to the end of 1991 December. 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. As a conclusion, we do not expect to see a resumption of the 154-day or 73-day periodicity, but we do expect only one of the periodicity near the integral multiples of 25d.8 in the next solar cycles.

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