2021 February 21 Sun - prominences on the NE solar limb

[PTS]

2021 February 21 Sun - prominences on the NE solar limb

The prominences here are the same as yesterday, except that the one on the north has erupted and becomes very tall since last night.
Sunspot count: group=1, sunspots=2, R=12

For H-alpha images:
Telescope: Lunt LS50T with B1200 blocking filter + 2X barlow
Camera : ASI174MM
exposure: 15 ms and 25 ms

For Ca-K images:
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: 10.0 ms

approximately north is up, east to the left

[PTS]

Images in H-alpha

[PTS]

more

[Eddy So]