Hydrogen and helium excitation by EUV radiation for the production of white-light flares

Non-LTE radiative transfer calculations for hydrogen and helium in a simple model atmosphere are used to demonstrate that EUV radiation cannot be the main energy source for white-light flares. The opacities in the Lyman continuum and the helium I and II continua are found to be much larger than the...

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Bibliographic Details
Published in:Solar physics 1988-01, Vol.115 (2 19), p.277-288
Main Authors: Poland, A. I., Milkey, R. W., Thompson, W. T.
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Flares, bursts, and related phenomena
Solar Physics
Solar system
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Summary:Non-LTE radiative transfer calculations for hydrogen and helium in a simple model atmosphere are used to demonstrate that EUV radiation cannot be the main energy source for white-light flares. The opacities in the Lyman continuum and the helium I and II continua are found to be much larger than the enhanced opacity in the visible hydrogen continuum. It is shown that the EUV radiation is absorbed before it can have a significant effect on the visible light continuum.
ISSN:0038-0938
1573-093X
DOI:10.1007/BF00148729