Statistical properties of H-alpha and HXR flares in the cycle 23 in relation to sunspots and active regions detected from the Solar Feature Catalogues

Details Statistical properties of H-alpha and HXR flares in the cycle 23 in relation to sunspots and active regions detected from the Solar Feature Catalogues Statistical properties of H-alpha and HXR flares in the cycle 23 in relation to sunspots and active regions detected from the Solar Feature Catalogues

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh43a1507z&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH43A-1507

Physics

1620 Climate Dynamics (0429, 3309), 5440 Magnetic Fields And Magnetism, 7845 Particle Acceleration

Scientific paper

The statistical properties of H-alpha and hard X-ray solar flares are investigated in relation to the cycle variations in 1996-2006 of sunspots and active regions (plages) obtained from the automated Soar Feature Catalogues (SFC, http://solar.inf.brad.ac.uk). Cross-correlation analysis is carried out between flare sizes, locations, significance and active region/sunspot parameters including magnetic field extracted in SFC. Sunspot and plage area distributions reveals a strong North-South asymmetry of about 0.2 and the period of about 7-8 years for sunspots and of 0.5 and period of 9 years for plages with both asymmetries decreasing towards the next cycle minimum. The temporal distribution of solar flare occurrences in Northern and Southern hemispheres, at different latitudes and longitudes are compared with those of plage and sunspot areas and LOS magnetic fields. The spectral indices of HXR and gamma-ray emission wer used to estimate magnetic field components and their variations with the cycle. The application of these results to the solar activity forecast is discussed.

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