Study of periodicities of solar nuclear gamma ray flares and sunspots

Details Study of periodicities of solar nuclear gamma ray flares and sunspots Study of periodicities of solar nuclear gamma ray flares and sunspots

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..138..205v&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 138, March 1992, p. 205-208.

Astronomy and Astrophysics

Astrophysics

11

Gamma Ray Bursts, Solar Cycles, Solar Flares, Sunspots, Emission Spectra, Nuclear Astrophysics, Solar Maximum Mission, Umbras

Scientific paper

A power-spectrum analysis of solar nuclear gamma-ray (NGR) flares observed by SMM and HINOTORI satellites was carried out. The solar NGR flares show a periodicity of 152 days, confirming the existence of a 152-158 days periodicity in the occurrence of solar activity phenomena and also indicating that the NGR flares are a separate class of solar flares. The power-spectrum analysis of the daily sunspot areas on the sun for the period 1980-1982 shows a peak around 159 days, while sunspot number data do not show any periodicity (Verma and Joshi, 1987). Therefore, only sunspot area data should be treated as an indicator of solar activity and not the daily sunspot number data.

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