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2023-12-07 18:44:01

Dr. John Barentine FRAS on Nostr: Today's H-alpha #Sun at 17:00 UTC. Chromospheric activity has calmed down since ...

Today's H-alpha #Sun at 17:00 UTC. Chromospheric activity has calmed down since yesterday, but the limb prominences continue to impress. The tall one standing nearly straight up on the NNE limb has a linear extent about 6.5 times the diameter of the Earth. #Astronomy #Solar #Cycle25





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