Abstract
A study is made of characteristics of the oscillatory process in a sunspot where, in addition to the high brightness in the cores of the H and K Caii lines, the H∈ line was also in emission. A bright H∈ emission persisted during six days at least.
An analog of the behaviour of the Caii and H∈ lines can be seen, presumably, on dwarf stars dKe and dMe.
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Turova, I.P. On the unusual H∈ emission in a sunspot umbra spectrum. Sol Phys 150, 71–79 (1994). https://doi.org/10.1007/BF00712877
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DOI: https://doi.org/10.1007/BF00712877