2023 March 17 Sun - Solar surface in Ca-K, with AR13247, AR13249, AR13250, AR13251, AR13252, AR13253, AR13254, AR13255 and possible AR1325a, AR1325b and AR1325c.
Sunspot count: group=10, sunspot=15, R=115
Sharpstar AL80 II refractor, ED Triplet. 500 mm f/6.25 for whole-disc
Camera : ASI1600MM Pro, cooled to -09.0C
Filters: Lunt Ca-K module B1200
approximately north is up, east to the left.
2023 March 17 Sun - Solar surface in Ca-K, with AR13247, AR13249, AR13250, AR13251, AR13252, AR13253, AR13254, AR13255 a
2023 March 17 Sun - Solar surface in Ca-K, with AR13247, AR13249, AR13250, AR13251, AR13252, AR13253, AR13254, AR13255 a
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