On the origin of the flare optical continuum

Details On the origin of the flare optical continuum On the origin of the flare optical continuum

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...49...91m&link_type=abstract

Solar Physics, vol. 49, July 1976, p. 91-94.

Physics

5

Emission Spectra, Radiative Transfer, Solar Flares, Solar Spectra, Equilibrium Equations, Far Ultraviolet Radiation, Hydrogen, Lyman Alpha Radiation, Solar Temperature, Stellar Models, Ultraviolet Spectra

Scientific paper

It is proposed that the emission from bluish-white knots observed in white-light flares is due to free-bound hydrogen emission from a 22,000-K temperature plateau formed in the region where the central parts of the low Lyman lines originate. An attempt is made to determine the characteristics the temperature plateau should have in order to modify the flare optical spectrum. A flare model containing such a plateau is computed by solving the equations of statistical equilibrium and radiative transfer for a three-level-plus-continuum hydrogen atom. It is concluded that if this model is correct, a strong contribution to the Lyman continuum below 700 A should be observed in the EUV spectrum with a color temperature of the order of 22,000 K.

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