Long-term variation of sunspot penumbra to umbra area ratio

Long-term variation of sunspot penumbra to umbra area ratio

Jha, Bibhuti Kumar, Mandal, Sudip, Banerjee, Dipankar
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Volume:
13
Language:
english
Journal:
Proceedings of the International Astronomical Union
DOI:
10.1017/S1743921318001989
Date:
February, 2018
File:
PDF, 140 KB
english, 2018
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