Sun in h-alpha/calcium-H (Spectroheliogram)
Taken by Richard Schrantz on April 28, 2025 @
Nicholasville, Kentucky, USA
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Here are two spectroheliograms in very good seeing from this morning (h-alpha and calcium-H). Finally, I am starting to get some more warm, humid days with light winds and the jet stream way up in Canada! Makes a big difference in the daytime seeing. 102mm f/7 homemade spectroheliograph.
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