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

VN Obridko, J Staude - … (ISSN 0004-6361), vol. 189, no. 1-2 …, 1988 - adsabs.harvard.edu
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 …
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