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Spectroscopic determination of intensities of umbral bright features and adjacent background

Bibcode
1992A&A...260..437S
Sobotka, M.; Bonet, J. A.; Vazquez, M.
Bibliographical reference

Astronomy and Astrophysics (ISSN 0004-6361), vol. 260, no. 1-2, p. 437-440.

Advertised on:
7
1992
Number of authors
3
IAC number of authors
3
Citations
11
Refereed citations
9
Description
Profiles of the Na I D doublet in three bright features (clusters of umbral dots), located in a relatively dark umbra, were analyzed by means of the 'local two-component modeling' to obtain the 'true' continuum intensities and temperatures of the bright features and their dark surroundings (background). The intensities of two central and one peripheral bright feature were 0.31 (background 0.11), 0.33 (0.13), and 0.40 (0.17), respectively. For the ratio of the object and background intensity (assumed to be constant, but unknown until now) the value of 2.6 +/- 0.2 was obtained.
Type
Refereed
Sunspots
Solar atmosphere

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