H-alpha redshifts as a diagnostic of solar flare heating

Details H-alpha redshifts as a diagnostic of solar flare heating H-alpha redshifts as a diagnostic of solar flare heating

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338l..33z&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 338, March 1, 1989, p. L33-L36.

Astronomy and Astrophysics

Astronomy

27

Chromosphere, H Alpha Line, Red Shift, Solar Corona, Solar Flares, Data Reduction, Doppler Effect, X Ray Astronomy

Scientific paper

The dynamics of chomospheric condensations formed during chromospheric evaporation are studied using coordinated X-ray and H-alpha observations of five solar flares. It is shown that the peak downflow velocity of condensations predicted by simple hydrodynamic compression of the chromosphere is in good agreement with empirical downflow velocities implied by impulsive phase H-alpha red wing Doppler shifts. It is found that the H-alpha wing redshift provides a diagnostic of the pressure excess in the evaporating region and the coronal energy flux driving chromospheric evaporation. Because preflare coronal pressures derived for each of the flares are high, it is suggested that the chromosphere succeeds in radiating excess flare heat energy without undergoing explosive chromospheric evaporation.

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