Sun in h-alpha/calcium-H (Spectroheliogram)
Taken by Richard Schrantz on June 25, 2025 @
Nicholasville, Kentucky, USA
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Here are h-alpha and calcium-H images of the sun recorded with a 102mm f/7 spectroheliograph this morning. Calcium-H stopped down to 72mm. The seeing was very good again! Still some nice filaments. ASI183mm camera.
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