Changes in the cosmic-ray power spectrum during solar flares

Details Changes in the cosmic-ray power spectrum during solar flares Changes in the cosmic-ray power spectrum during solar flares

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991cajph..69..976k&link_type=abstract

Canadian Journal of Physics (ISSN 0008-4204), vol. 69, Aug.-Sept. 1991, p. 976-980.

Physics

2

Cosmic Rays, Power Spectra, Solar Flares, Canada, Czechoslovakia, Magnetic Rigidity, Neutron Counters, Solar Cosmic Rays

Scientific paper

The power spectrum analyses of cosmic-ray neutron-monitor data at two different cutoff rigidity stations, Calgary (1.09 GV) and Lomnicky Stit (4.0 GV), exhibit similar changes in power spectral form in the frequency interval 10 exp -5 to 0.001 Hz before and after the six solar flare events that occurred from January 1989 to June 1990. The power spectrum index n at both stations, which showed significantly lower values one day before the flare onset, indicated a sharp steepening of the spectral shape following the flare event. The change in the power spectrum is attributed to the redistribution of inhomogeneities near the sun, produced before the solar flares in which cosmic-ray particles are accelerated to high energies, to produce a ground level event.

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