Sun in h-alpha/calcium-H (Spectroheliogram)
Taken by Richard Schrantz on July 3, 2025 @
Nicholasville, Kentucky, USA
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Details:
Here is the sun from this morning in good seeing (h-alpha and calcium-H) using a 102mm f/7 homemade spectroheliograph. The calcium image was stopped down to 72mm. ASI183mm camera. The huge arch prominence from yesterday was gone this morning!
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