Sun In H-alpha/calcium-K (Spectroheliogram)

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Sun in h-alpha/calcium-K (Spectroheliogram)
Taken by Richard Schrantz on October 12, 2025 @ Nicholasville, Kentucky, USA

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Here are h-alpha and calcium-K images of the sun recorded with a 102mm f/7 spectroheliograph. Calcium stopped to 72mm. ASI183mm camera. Very good seeing.

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