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AR12829 Ca-K
salvolauricella
AR12829 CAK
salvolauricella
AR12827 CAK
salvolauricella
Sunspots AR2824 and AR2826
PhotonJohn
Sun in continuum with H-alpha telescope, AR2824...
Andrej Duboš
Sun H-alpha 26-May-2021
Andrej Duboš