Periodicities of the flare occurrence rate in solar cycle 19

Details Periodicities of the flare occurrence rate in solar cycle 19 Periodicities of the flare occurrence rate in solar cycle 19

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318l..85b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 318, July 15, 1987, p. L85-L91.

Astronomy and Astrophysics

Astrophysics

48

Periodic Variations, Solar Activity, Solar Cycles, Solar Flares, Monte Carlo Method, Northern Hemisphere, Phase Diagrams, Power Spectra, Sine Waves, Solar X-Rays

Scientific paper

The occurrence rate of major flares during solar cycle 19 has been analyzed. A periodicity of 51 d is found, which is one-third of the period found from the flare rates of solar cycles 20 and 21 by various authors. The statistical significance of the periodicity is estimated to be at 99.85-percent confidence level. This periodicity is though to be related to the 153-d periodicity. The template of the phase diagram is well described by a constant plus a sine function. Additionally, an 18-month periodicity is found in the flare rate of the northern hemisphere.

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