2021 October 17 Sun - solar surface in Ca-K, with no numbered active region.
With AR12882 turned to the backside, there is no active region on the solar disc.
Many groups of plages are visible.
Sunspot count: group=0, sunspot=0, R=0
Telescope: Sharpstar AL-80 II, 8 cm f/6.25 APO refractor
Camera : ASI1600MM Pro, not cooled.
focal length : 500 mm f/6.25
filter: Lunt Ca-K Module B1200
approximately north is up, east to the left.
2021 October 17 Sun - solar surface in Ca-K, with no numbered active region.
2021 October 17 Sun - solar surface in Ca-K, with no numbered active region.
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