Solar minimum full disk in Ca-K
Taken by Marco on October 21, 2018 @
Rivalta, Italy
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Details:
Today's Sun in the Ca-K line. I had not used this filter for a while. Surface magnec fields are well visible in this spectral line. Today the Sun is calm and "flat", but the Calcium line reveals that some activity still persists where there has been a small sunspot a week ago, now on the right side of the disk. 80ED refractor, barlow, DMK41 camera, Lunt Ca-k filter.
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