Sun in h-alpha/calcium-H (Spectroheliogram)
Taken by Richard Schrantz on July 23, 2025 @
Nicholasville, Kentucky, USA
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Here is the sun today recorded with a 102mm f/7 homemade spectroheliograph. h-alpha and calcium-H. The seeing was very good. I wish the sun was a bit more active! ASI183mm camera.
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