Quasi-periodic variations in manifestations of solar activity

Details Quasi-periodic variations in manifestations of solar activity Quasi-periodic variations in manifestations of solar activity

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987kosis..25..325z&link_type=abstract

Kosmicheskie Issledovaniia (ISSN 0023-4206), vol. 25, Mar.-Apr. 1987, p. 325-328. In Russian.

Physics

2

Periodic Variations, Solar Activity, Time Series Analysis, Annual Variations, Galactic Cosmic Rays, Solar Protons, Solar Terrestrial Interactions, Spectrum Analysis

Scientific paper

A spectral time-series analysis for the 20th and 21st solar cycles shows that the variations of various geoheliophysical characteristics have three basic periods less than 11 years: approximately two years, approximately one year, and approximately five months; the quasi-biennial variations are the most intense. Variations of the frequency of solar proton events and galactic cosmic rays are basically in counterphase. The period of quasi-biennial variations in the 21st cycle is shorter than that in the 20th cycle.

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