Cyclic distribution of energetic X-ray flares

Details Cyclic distribution of energetic X-ray flares Cyclic distribution of energetic X-ray flares

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..107..195l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 107, no. 1, 1987, p. 195-199.

Physics

5

Solar Flares, Solar X-Rays, Maximum Entropy Method, Power Spectra, Reliability, Spectrum Analysis

Scientific paper

The Blackman-Tukey (1959) power spectrum of flare generated X-ray bursts greater than or equal to X1 observed during 1970-1982 with SOLRAD, SMS, and GOES satellite instrumentation shows prominent peaks corresponding to 156, 4.8, 2.8, and 1.1 months. A statistical test of the significance of the deviation of these peaks from Markov red noise shows that the peaks at 2.8 and 1.1 months are significant at the 99 percent confidence level while that at 4.8 months is significant at the 95 percent confidence level. The maximum entropy method shows the same prominent peaks at the same frequencies as in the Blackman-Tukey power spectrum and a narrower sampling interval of 0.25 month does not change the result. It is noted that prominent cyclic features are present in all spectra examined.

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