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What causes this circle ?
Posted September 15, 2014 10:33 PM
@ElisabethB it seems the circle is a spot in this sunspot group, look http://bit.ly/1oXlgk2 - change the opacity on the left (MDI Int)
Posted September 16, 2014 10:34 PM
Thanks ! 😄
Posted September 18, 2014 6:42 AM