Sun in h-alpha/calcium-H (Spectroheliogram)
Taken by Richard Schrantz on April 9, 2025 @
Nicholasville, Kentucky, USA
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For the first time in a month, the sky cooperated today for some spectroheliograph imaging. Here is an h-alpha and a calcium-H image. The seeing was OK for the h-alpha image, but it had deteriorated during the calcium imaging. Oh well......can't wait for summer good seeing! 102mm f/7 SHG (stopped to 70mm for calcium), ASI183mm camera.
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