Physics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...87..329d&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 87, Sept. 1983, p. 329-335.
Physics
7
Solar Atmosphere, Solar Flares, Solar Radiation, Stellar Models, Sunlight, Visible Spectrum, Atmospheric Models, Balmer Series, Chromosphere, Continuous Spectra, Photosphere, Solar Physics
Scientific paper
It is shown that some recently published semiempirical models for solar flares predict a significant flux of visible continuum radiation, due to bound-free radiation from hydrogen atoms and H(-) ions in the chromospheric flare. The ratio of the emergent intensity in one flare model to that in the quiet sun is more than 100 percent at the head of the Balmer continuum for a flare close to the limb, and 8 percent at disk centre. The predicted flare spectrum has a relatively strong Balmer jump. The theoretical flare continuum is compared with observations, and disageement is found in several important respects. The main disagreements are: (1) the fact that few flares are observed to emit a white light continuum, while the models suggest that they should do so; (2) the prediction of a strong Balmer jump, which is not observed in most white-light flares; and (3) the absence of a 'blue continuum' in the theoretical prediction. It is concluded that observations of flare continua provide useful constraints on semiempirical models, and that at present the models do not satisfy these constraints.
Cram Lawrence
Dame Luc
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