Sun CaK
Taken by Stefano Sello on April 4, 2017 @ Pisa - Italy
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Date Taken: 2017:04:04 16:33:50
  
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Details:
Active regions AR2644, AR2645 and AR2648 are ready to produce further interesting flares. Photo details: Solarmax CaK70 solar telescope and LU135-M CCD camera. 11:15 UT.
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