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-grad
The structure of sunspots
โ Scribed by P.A. Sweet
- Publisher
- Elsevier Science
- Year
- 1955
- Tongue
- English
- Weight
- 737 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0083-6656
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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
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