Images 31.10.2025 · Istanbul University Observatory Solar Observations

Solar Images Friday, 31 October 2025

‹ 30.10.2025 2025 01.11.2025 ›

Photosphere sunspot drawing and RDS evaluation

High-resolution scan (3230 px)

Time: 09:00 UT
Observer: Ergün EGE
g: 4
f: 5
R: 45
Seeing: 3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · AX_ – 1

Group 2 · HS_ – 2

Group 3 · AX_ – 1

Group 4 · AX_ – 1

RDS data file (.gzd)

[Gözlem]
Tarih=31.10.2025
Saat=09:00
Gözlemci=Ergün EGE
KontrolEden=Burçin TANIK
Durumaçısı=24.55
Enlemaçısı=4.45
Boylamaçısı=31.28
Boylamfark=2
GKalite=3
GDurum=
Kuzeyaçısı=-0.5
Sırano=20377
AyRasatNo=20
RasatÖnceki=30.10.2025
RasatSonraki=01.11.2025

[Leke Grupları]
Grupsayısı=4:2:2
LekeSayısı=5:3:2
RölatifSayı=45:23:22
01=AX_ 01 +18.137 +55.604 086.884 +0.000 0000 0 +18.373 +56.422 +17.901 +54.787 +18.137 +55.922 +18.137 +55.286
02=HS_ 02 +05.551 +28.227 059.507 +0.000 0000 0 +09.950 +29.483 +01.152 +26.970 +05.551 +28.983 +05.551 +27.470
03=AX_ 01 -04.918 +70.468 101.748 +0.000 0000 0 -04.620 +71.673 -05.216 +69.263 -04.918 +71.173 -04.918 +69.763
04=AX_ 01 -10.738 +31.270 062.550 +0.000 0000 0 -10.415 +31.556 -11.610 +30.983 -10.738 +31.570 -10.738 +31.483

20251031.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 →

2025/20251031 · · 9 frames · 192.8 MB · 09:08:27–09:15:39 UT

09:08:27 UT · 40 ms