AR4172 Umbral Flashes

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AR4172 Umbral Flashes
Taken by David Wilson on August 12, 2025 @ Inverness, Scotland

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I caught a couple of minutes of AR4172 while testing out a new barlow lens. Decided to animate it anyway and it looks like the large western sunspot is pulsating with umbral flashes.

Photographer's website:

https://tinyurl.com/5d83mn5j

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