2023 March 18 Sun - Very faint filamentary prominences on SW solar limb.

[PTS]

2023 March 18 Sun - Very faint filamentary prominences on SW solar limb.

Note the changes of this prominences.

Sunspot count: group=6, sunspot=12, R=72

Camera : ASI1600MM Pro, cooled to -11.0C

Telescope for Ca-K:
Baader Triband C9.25 solar telescope, 235 mm f/10
Sharpstar AL80 II refractor, ED Triplet. 500 mm f/6.25 for whole-disc
Filters: Lunt Ca-K module B1200

Telescope for H-alpha:
Sharpstar AL80 II refractor, ED Triplet. 500 mm f/6.25 for whole-disc
with 2.5X barlow for close-up.
Filters: Lunt LS50T module with H-alpha B1200 blocking filter
.
approximately north is up, east to the left.

[PTS]

Images in H-alpha

[Eddy So]