Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 10 December 2025

‹ 06.12.2025 2025 11.12.2025 ›

Photosphere sunspot drawing and RDS evaluation

10.12.2025 photosphere drawing

High-resolution scan (3231 px)

Time
09:25 UT
Observer
Ergün EGE
g
7
f
35
R
105
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · BXO – 4Group 1 · BXO – 4 Group 2 · CSI – 9Group 2 · CSI – 9 Group 3 · HS_ – 1Group 3 · HS_ – 1 Group 4 · FSC – 12Group 4 · FSC – 12 Group 5 · HS_ – 1Group 5 · HS_ – 1 Group 6 · AX_ – 1Group 6 · AX_ – 1 Group 7 · CSI – 7Group 7 · CSI – 7
RDS data file (.gzd) 
[Gözlem]
Tarih=10.12.2025
Saat=09:25
Gözlemci=Ergün EGE
KontrolEden=Süleyman FİŞEK
Durumaçısı=12.15
Enlemaçısı=-0.31
Boylamaçısı=223.78
Boylamfark=1
GKalite=3
GDurum=B.A , Y.B
Kuzeyaçısı=-0.2
Sırano=20401
AyRasatNo=5
RasatÖnceki=06.12.2025
RasatSonraki=11.12.2025

[Leke Grupları]
Grupsayısı=7:2:5
LekeSayısı=35:13:22
RölatifSayı=105:33:72
01=BXO 04 +22.210 +40.688 264.468 +0.000 0000 0 +23.716 +45.214 +20.327 +36.162 +22.210 +45.140 +22.210 +36.362
02=CSI 09 +25.599 +26.620 250.400 +0.000 0000 0 +26.939 +30.723 +24.259 +22.518 +25.599 +30.523 +25.599 +22.718
03=HS_ 01 -16.291 +81.997 305.777 +0.000 0000 0 -15.181 +84.472 -17.401 +79.522 -16.291 +83.972 -16.291 +80.220
04=FSC 12 -15.454 +55.812 279.592 +0.000 0000 0 -11.000 +65.188 -19.909 +46.435 -15.454 +64.988 -15.454 +46.635
05=HS_ 01 -15.644 +41.530 265.310 +0.000 0000 0 -14.728 +42.550 -16.559 +40.510 -15.644 +42.500 -15.644 +41.100
06=AX_ 01 -25.515 -19.321 204.459 +0.000 0000 0 -25.260 -19.590 -26.400 -19.582 -25.515 -19.817 -25.515 -18.825
07=CSI 07 -24.180 -28.365 195.415 +0.000 0000 0 -22.735 -24.998 -25.626 -31.732 -24.180 -25.198 -24.180 -31.532
20251210.gzd

Chromosphere (H-α) FITS frames

H-α

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 →

2025/20251210 · · 1 frames · 21.4 MB · 09:30:32 UT

09:30:32 UT · 50 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.