The periodicity of AR 5395 evolution

Details The periodicity of AR 5395 evolution The periodicity of AR 5395 evolution

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991chjss..11..161l&link_type=abstract

Chinese Journal of Space Science (ISSN 0254-6124), vol. 11, no. 3, p. 161-167.

Physics

Periodic Variations, Solar Flares, Solar X-Rays, Sunspots, Solar Flux, Solar Spectra

Scientific paper

There are periodical characteristics in the evolution of AR 5395, shown by analyzing the observational data of X-ray flares and area of sunspot group. For AR 5395, the variation of peak flux Fx of soft X-ray exhibits a periodicity about 24.3 hours, the periodicity for the occurrence rate Nx of X-ray flares is about 12.2 hours, and the area Sx of sunspot groups varies with 24.4 hours period. The phase relations among these three periodical parameters show that: (1) the flares with X class generally appears at the decreasing phase of the periodical variation of sunspot area; (2) the area of sunspot groups takes about 16 hours to reach the maximum in the 24.4 hours period; and (3) the rate of the occurrence of X-ray flares reaches the maximum before the appearance of X class flare in about 12 hours. It seems that AR 5395 is in a state of energy store-release-store cycle of large flares with a periodicity about 24 hours.

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