Images 22.08.2025 · Istanbul University Observatory Solar Observations

Photosphere sunspot drawing and RDS evaluation

High-resolution scan (3230 px)

Time: 10:15 UT
Observer: Ergün EGE
g: 4
f: 12
R: 52
Seeing: 3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CSO – 5

Group 2 · DSI – 5

Group 3 · HR_ – 1

Group 4 · HS_ – 1

RDS data file (.gzd)

[Gözlem]
Tarih=22.08.2025
Saat=10:15
Gözlemci=Ergün EGE
KontrolEden=Ergün EGE
Durumaçısı=18.43
Enlemaçısı=6.95
Boylamaçısı=234.49
Boylamfark=1
GKalite=3
GDurum=
Kuzeyaçısı=-0.5
Sırano=20329
AyRasatNo=17
RasatÖnceki=21.08.2025
RasatSonraki=24.08.2025

[Leke Grupları]
Grupsayısı=4:2:2
LekeSayısı=12:10:2
RölatifSayı=52:30:22
01=CSO 05 +07.717 -13.184 221.306 +0.000 0000 0 +08.704 -11.319 +06.731 -15.500 +07.717 -11.519 +07.717 -14.850
02=DSI 05 +10.600 -63.725 170.765 +0.000 0000 0 +12.767 -58.560 +08.433 -69.393 +10.600 -58.256 +10.600 -69.193
03=HR_ 01 -19.135 +24.293 258.783 +0.000 0000 0 -18.705 +24.733 -19.564 +23.852 -19.135 +24.233 -19.135 +24.352
04=HS_ 01 -08.586 -26.411 208.790 +0.000 0000 0 -07.813 -25.613 -09.360 -27.209 -08.586 -26.113 -08.586 -26.709

20250822.gzd

Chromosphere (H-α) FITS frames

The images are made automatically with a fixed, gentle rule: uneven illumination and most of the limb darkening are removed, and the brightness is shown on a linear scale (no sharpening); prominences get their own scale outside the limb. Frames are ordered by sharpness (seeing); frames without the Sun (darks, bias) come last. Method →

2025/20250822 · · 25 frames · 535.6 MB · 10:21:49–10:44:48 UT