A 154 day periodicity in the occurrence rate of proton flares

Details A 154 day periodicity in the occurrence rate of proton flares A 154 day periodicity in the occurrence rate of proton flares

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...363..299b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 363, Nov. 1, 1990, p. 299-309. Previously announced in STAR as N90-23333.

Other

83

Periodic Variations, Solar Activity, Solar Cycles, Solar Flares, Solar Protons, Fast Fourier Transformations, Power Spectra

Scientific paper

We have analyzed periodicities in the occurrence rate of proton flares for solar cycles 19 through 21 (1955 to 1986) and have identified two epochs that exhibit a 154-day periodicity. These epochs are a 14-year interval from 1958 January through 1971 December and a 5.5-year interval from 1978 February to 1983 August. The best-determined period is 154.6. We have found that the phase of this periodicity changed between the above-mentioned two epochs by about one half of a period. It appears that the occurrence rate of proton flares is more sensitive to the 154-day periodicity than the occurrence rate of flares selected by other criteria.

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