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On the minimum intensity of the Na D2-5890 Å line in sunspot umbra

✍ Scribed by T. Fay; J. Remo; K. Czaja

Publisher
Springer
Year
1972
Tongue
English
Weight
143 KB
Volume
26
Category
Article
ISSN
0038-0938

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Spectroscopic observations of the Nal D emission lines of prominences were made with the Domeless Solar Telescope in Hida Observatory. When active prominences are bright in the D 2 emission line, the intensity ratio of D~ to D 2 is found to deviate significantly from the theoretical ratio of the opt