Investigation of X-ray and optical solar flare activities during solar cycles 22 and 23

Details Investigation of X-ray and optical solar flare activities during solar cycles 22 and 23 Investigation of X-ray and optical solar flare activities during solar cycles 22 and 23

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003kfnt...19....3a&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, vol. 19, no. 1, p. 3-12

Computer Science

Scientific paper

Daily X-ray flare indices (XFI) for the interval from January 1986 till June 2002 were calculated. The XFI behaviour during solar cycles 22 and 23 was studied. We compare the daily XFI with the daily optical flare indices (OFI) and with the International Relative Sunspot Numbers. The energy emitted by X-ray flares during 77 months of solar cycle 22 is shown to be about five times larger than the analogous value for the present solar cycle. We revealed statistically significant maxima in power spectra of the XFI and OFI. They correspond to periods of 25.5, 36.5, 73, 116, and 150d which presumably are appropriate to characteristic frequencies of the solar flare activity. A hypothesis on an possible effect of Mercury's variable electric charge on the origin of solar flares is proposed and corresponding estimates were made.

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