The sunspot models published so far do not reproduce the observed run of the umbral continuum intensities over the entire spectral range 0.5 < 2 < 4 ~m. Moreover, in several previous models is the temperature gradient smaller than both the adiabatic and the radiative equilibrium gradient. Agreement
Structure of sunspots
โ Scribed by Cornelis Zwaan
- Publisher
- Springer
- Year
- 1975
- Tongue
- English
- Weight
- 198 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0038-0938
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โฆ Synopsis
We present a minimum-gradient model 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 Tert = 4000K. 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 maxlmum-gradient model.
We show that various published models are not compatible with plausible constraints on the temperature gradient.
๐ SIMILAR VOLUMES
A new model for the structure of a sunspot is put forward. The features of the model are (i) the deep inhibition of convection by magnetic fields, (ii) the formation of a 'cool cone' above the region of inhibition of convective transfer by the energy diverted around tiffs region, and (iii) the devel