Physics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..125..321k&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 125, Feb. 1990, p. 321-332.
Physics
28
Astronomical Photometry, H Alpha Line, Solar Flares, Solar X-Rays, High Resolution, Light Curve, Solar Observatories, Spectroheliographs
Scientific paper
An H-alpha two-ribbon flare, observed on October 12, 1981, and measured using a two-dimensional microdensitometer, is examined. The results show that the impulsive phase of the flare started with the progressive brightenings of its points forming the front lines of the H-alpha two ribbons at both sides of the magnetic neutral line, which were followed by the explosive expansion of ribbons at the main impulsive phase. Three typical shapes of H-alpha light curves were observed and characterized according to the intensity increase. It is shown that these light curves are caused by different heating mechanisms, such as electron precipitation, heat conduction, and soft X-ray radiation. The correlation between hard X-ray and H-alpha total intensity integrated over the whole H-alpha flare region is demonstrated.
Kitahara Tomonari
Kurokawa Hiroki
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