Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Monday, 29 December 2025

‹ 19.12.2025 2025 30.12.2025 ›

Photosphere sunspot drawing and RDS evaluation

29.12.2025 photosphere drawing

High-resolution scan (3230 px)

Time
10:15 UT
Observer
E.EGE+E.Y.
g
8
f
34
R
114
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · DSI – 3Group 1 · DSI – 3 Group 2 · DSC – 11Group 2 · DSC – 11 Group 3 · DKC – 6Group 3 · DKC – 6 Group 4 · HS_ – 1Group 4 · HS_ – 1 Group 5 · DSC – 8Group 5 · DSC – 8 Group 6 · AX_ – 3Group 6 · AX_ – 3 Group 7 · AX_ – 1Group 7 · AX_ – 1 Group 8 · AX_ – 1Group 8 · AX_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=29.12.2025
Saat=10:15
Gözlemci=E.EGE+E.Y.
KontrolEden=Ergün EGE
Durumaçısı=3.29
Enlemaçısı=-2.69
Boylamaçısı=332.7
Boylamfark=1
GKalite=3
GDurum=
Kuzeyaçısı=-0.1
Sırano=20409
AyRasatNo=13
RasatÖnceki=19.12.2025
RasatSonraki=30.12.2025

[Leke Grupları]
Grupsayısı=8:2:6
LekeSayısı=34:14:20
RölatifSayı=114:34:80
01=DSI 03 +11.700 +39.769 012.469 +0.000 0000 0 +12.247 +42.267 +09.893 +37.272 +11.700 +42.670 +11.700 +37.472
02=DSC 11 +24.381 -47.944 284.756 +0.000 0000 0 +27.700 -43.860 +21.610 -52.270 +24.381 -44.600 +24.381 -51.827
03=DKC 06 -10.208 +67.522 040.222 +0.000 0000 0 -07.741 +64.381 -12.674 +70.662 -10.208 +70.462 -10.208 +64.581
04=HS_ 01 -14.300 -31.505 301.195 +0.000 0000 0 -13.794 -30.616 -14.806 -32.394 -14.300 -31.116 -14.300 -31.894
05=DSC 08 -08.111 -40.419 292.281 +0.000 0000 0 -05.937 -45.341 -10.284 -35.498 -08.111 -35.698 -08.111 -45.141
06=AX_ 03 -14.972 -48.826 283.874 +0.000 0000 0 -13.681 -47.860 -16.264 -49.791 +00.000 +00.000 +00.000 +00.000
07=AX_ 01 -15.807 -63.243 269.457 -1.000 0000 0 -15.807 -63.243 -15.807 -63.243
08=AX_ 01 -25.360 -73.567 259.133 -1.000 0000 0 -25.360 -73.567 -25.360 -73.567
20251229.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 →

2025/20251229 · · 8 frames · 171.4 MB · 10:26:58–10:37:10 UT

10:34:12 UT · 30 ms 10:34:52 UT · 40 ms 10:26:58 UT · 30 ms 10:29:37 UT · 40 ms 10:36:34 UT · 50 ms · over-exposed 10:31:01 UT · 50 ms · over-exposed 10:37:10 UT · 60 ms · over-exposed 10:32:17 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.