Sun in helium D vs. SDO 211 A coronal hole
Taken by Richard Schrantz on October 10, 2025 @
Nicholasville, Kentucky, USA
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Details:
Here is a helium D image of the sun from this morning using a 102mm f/7 spectroheliograph and ASI183mm camera. Compared to it is a SDO satellite image at 211 Angstroms (extreme UV). Note the coronal hole in the satellite image and also visible in the helium image.
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