A two-component working model for the atmosphere of a large sunspot umbra

Details A two-component working model for the atmosphere of a large sunspot umbra A two-component working model for the atmosphere of a large sunspot umbra

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...189..232o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 189, no. 1-2, Jan. 1988, p. 232-242.

Astronomy and Astrophysics

Astrophysics

43

Solar Atmosphere, Stellar Models, Sunspots, Umbras, Chromosphere, Cold Plasmas, Fine Structure, Photosphere, Solar Corona, Solar Temperature

Scientific paper

A two-component working model for the atmosphere of the umbra of a typical large sunspot is proposed which represents an improvement over the earlier Wroclaw-Ondrejov sunspot model. The main component is assumed to consist of cold matter at photospheric levels, a thin chromosphere, a shallow transition region, and a deep-set corona. The secondary component in the model has a volume filling factor of 5-10 percent at all heights and is suggested to consist of thin fine-structure elements which are elongated parallel to the magnetic field. The present model is able to account for the basic features of sunspot observations at frequencies from X-rays up to microwaves.

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