The Wilson Effect?
Taken by David Wilson on May 10, 2025 @
Inverness, Scotland
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Details:
This shows AR4079 approaching the western limb today. I think it shows the Wilson effect which states that sunspots are actually depressions in the solar surface. (I may be biased because Alexander Wilson was a Scottish astronomer after whom the effect is named.)
Photographer's website:
https://imgur.com/user/StarryDave/posts
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