Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...225..204d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 225, no. 1, Nov. 1989, p. 204-212. Research supported by the National Natural
Astronomy and Astrophysics
Astrophysics
59
Penumbras, Solar Atmosphere, Solar Magnetic Field, Stellar Models, Sunspots, Magnetohydrostatics, Radiative Transfer, Solar Spectra, Zeeman Effect
Scientific paper
A new semiempirical model of a sunspot penumbra is presented in this paper. The model is based on the profiles of H-alpha, H-beta, Ca II H and K and infrared lines observed at Kitt Peak Observatory on July 3, 1985. Non-LTE calculations are made to obtain the atmospheric model. In the temperature minimum region there is a notable negative value of the net radiative loss rate. By analyzing the magnetohydrostatic equilibrium of the model atmosphere, it is shown that the magnetic force has a great impact on the distribution of particle densities at and above the upper chromosphere, whereas it does not change substantially the emergent intensities of the seven lines except those of the line cores of Ca II H and K.
Ding Ming-De Ding
Fang Chen
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