Structure of sunspots. III - A minimum-gradient model atmosphere for umbrae

Details Structure of sunspots. III - A minimum-gradient model atmosphere for umbrae Structure of sunspots. III - A minimum-gradient model atmosphere for umbrae

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...45..115z&link_type=abstract

Solar Physics, vol. 45, Nov. 1975, p. 115-118.

Physics

21

Astronomical Models, Solar Atmosphere, Sunspots, Umbras, Absorption Spectra, Brightness Temperature, Hydrogen Ions, Line Spectra, Radiant Flux Density, Stellar Structure

Scientific paper

A minimum-gradient model is presented to complement a maximum-gradient model (Zwaan, 1974). Both models are compatible with published continuum intensities and within constraints on the temperature gradient; both are adjusted to an effective temperature of 4000 K. In order to explain the visual intensities, the minimum-gradient model requires an additional 'line-haze' opacity which is only slightly smaller than in the maximum-gradient model. It is shown that various published models are not compatible with plausible constraints on the temperature gradient.

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