2020 September 19 Sun - solar surface in Ca-K

[PTS]

2020 September 19 Sun - solar surface in Ca-K

The solar surface is basically featureless in Ca-K light., except for a small active region just west of the meridian in the southern hemisphere. It comes with flare and filaments.
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

[Eddy So]