2020 September 25 Sun - prominences on the NW solar limb

[PTS]

2020 September 25 Sun - prominences on the NW solar limb

In H-alpha, this seems to be a group of low prominences. However, many show formation of arches in Ca-K
Sunspot count: group=1. sunspots=1, R=11

For H-alpha images:
Telescope: Lunt LS50T with B600 blocking filter
Camera : ASI174MM
exposure: 17.0 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: 8.0 ms

approximately south is up, east to the left

[Eddy So]