Periodicities in Forbush decreases and solar activity

Details Periodicities in Forbush decreases and solar activity Periodicities in Forbush decreases and solar activity

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..153..445r&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 153, no. 1-2, p. 445-448

Physics

5

Forbush Decreases, Periodic Variations, Solar Diameter, Solar Flares, Solar Neutrinos, Solar Protons, Confidence Limits, Fourier Transformation, Spectral Correlation

Scientific paper

We have studied Forbush decreases (FD) with solar flare data and major solar proton event (SPE) data (E greater than 10 MeV) for the years 1976 - 1986 and have found that FD solar flare data exhibit periods around 0.95, 2.4, and 4.75 years at greater than 99% level of confidence (CL), while SPE data exhibit periods around 2.6 and 5.0 years (at greater than 95% CL). Because of a common periodicity around 2.5 years, it is suggested that FD with the solar flare data and major SPE data, together with solar diameter and solar neutrino variations, behave similarly and may have a common origin.

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