Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26at...22..325k&link_type=abstract
Astronomical and Astrophysical Transactions, vol. 22, Issue 3, p.325-333
Astronomy and Astrophysics
Astrophysics
Scientific paper
The flare energy distribution of ultraviolet Ceti-type stars has a power-law spectrum N ~ E(-b) . Solar optical flares have an identical power energy spectrum with b ≈ 0.80. In a preliminary study (1972-1993), the X-ray flare energy spectrum was represented by a unique power law over the whole range of energies with b = 0.75. The purpose of this paper is to reveal the temporal variations in the power-law spectrum of X-ray flares over three solar cycles (1972-2001). A more extensive statistic (56,500 flares) allow us to revise earlier results and to find new data. The parameters b and log E_m of the energy spectrum undergo variations associated with a 11-year cycle phase and correlate with the Wolf number. The 3-cycle-averaged b is 0.666, with variations in the range 0.50 lt b lt 0.80. The result obtained may be useful for the study of flare activity on red dwarf stars.
Kasinsky V. V.
Sotnicova R. T.
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