A comparison of H-alpha and soft X-ray characteristics of spotless and SPOT group flares

Details A comparison of H-alpha and soft X-ray characteristics of spotless and SPOT group flares A comparison of H-alpha and soft X-ray characteristics of spotless and SPOT group flares

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..123..309r&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 123, no. 2, 1989, p. 309-316.

Physics

11

H Alpha Line, Magnetic Field Configurations, Solar Flares, Solar X-Rays, X Ray Spectra, Magnetohydrodynamic Stability, Plasma Temperature, Solar Activity, Solar Magnetic Field, Sunspots

Scientific paper

A comparative analysis of spotless and spot group flares recorded during the 21st cycle of solar activity is presented. The rate of occurrence of two-ribbon flares was found to be significantly higher for the spotless flares. In comparison with spot group flares of corresponding H-alpha importance, the soft X-ray peak values have been systematically lower for the spotless flares. It is found that the effective plasma temperatures in spotless flares have been considerably lower than the temperatures in spot group flares.

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