2020 September 20 Sun - solar surface in Ca-K
The solar surface is basically featureless in Ca-K light. The small active region is still active with flares and filament.
Sunspot count: group=0. sunspot=0, R=0
Telescope: Sharpstar AL-80 II, 8 cm f/6.25 APO refractor
Camera : ASI174MM
focal length : 500 mm f/6.25
filter: Lunt Ca-K Module B1200
exposure: 0.30 ms
approximately south is up, east to the left
2020 September 20 Sun - solar surface in Ca-K
2020 September 20 Sun - solar surface in Ca-K
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