2023 May 19 Sun - Solar surface in Ca-K, with AR13301, AR13302, AR13303, AR13304, AR13305, AR13307, AR13308, AR13309, AR

[PTS]

2023 May 19 Sun - Solar surface in Ca-K, with AR13301, AR13302, AR13303, AR13304, AR13305, AR13307, AR13308, AR13309, AR13310, AR13311 and possible AR1331a.

AR13301 shows up at (N14W53). No sunspot is observed, leaving just patches of plages.
AR13302 shows up at (N18W49). 1 sunspot with full penumbra is observed, surrounded by plages.
AR13303 shows up at (S10W71). No sunspot is observed, leaving just patches of plages.
AR13304 shows up at (N20W77). No sunspot is observed, leaving just plages.
AR13305 is located at (N12W45). Most of the sunspots are observed, embedded plages.
AR13307 is located at (S08W12). 1 of the sunspots is observed, embedded in plages.
AR13308 is located at (N12W30). Most of the sunspots are observed, embedded in plages.
AR13309 is located at (S19W66). One of the sunspots is observed, embedded in plages.
AR13310 is located at (S20E57). The large leading sunspot, embedded in plages, comes with penumbra and split umbra.
AR13311 is located at (N18E74). Most of the sunspots are observed, embedded in plages. Flares are also observed.
Meanwhile, a new AR, possibly AR1331a, appears at (S25E80). Most of the sunspots, embedded in plages, are observed.

Sunspot count: group=8, sunspot=62, R=142

Telescope: Baader Triband C9.25 solar telescope, 235 mm f/10 with Sharpstar AL80 II refractor, ED Triplet. 500 mm f/6.25 for whole-disc
Camera : ASI1600MM Pro, cooled to -5.0C.
Filters: Lunt Ca-K module B1200

approximately north is up, east to the left.

[PTS]

Images of AR13304 and AR13307

[PTS]

Images of AR13303, AR13308 and AR13309

[PTS]

Images of AR13310 and possible AR1331a

[PTS]

Images of AR13311

[Eddy So]