Comparison between some H alpha and X-ray flares

Details Comparison between some H alpha and X-ray flares Comparison between some H alpha and X-ray flares

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...54..169f&link_type=abstract

Solar Physics, vol. 54, Sept. 1977, p. 169-178. Research supported by the Consiglio Nazionale delle Ricerche.

Physics

7

H Alpha Line, Solar Atmosphere, Solar Flares, Solar Spectra, Solar X-Rays, Chromosphere, Far Ultraviolet Radiation, Radiant Flux Density, Solar Corona

Scientific paper

H alpha-evolutive curves of chromospheric events are compared with flux evolutive curves of X-ray events observed simultaneously in different spectral regions. An intensity correspondence between H alpha-intensity levels and soft X-ray emission in different spectral ranges has been found. The proportionality between the variations of X-ray and H alpha-fluxes during the rise time and flash-phase of the phenomenon has been determined. An analysis of the H alpha-isophotes, showing the existence of a single H alpha-flaring region, corresponds with the results regarding cospatiality and contemporaneity of the brightest EUV and H alpha-regions. These results indicate a single triggering mechanism, which might be a beam of nonthermal electrons directed downwards from the corona into the deeper layers of the solar atmosphere, during the flashphase of the flare.

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