Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Tuesday, 23 September 2025

‹ 22.09.2025 2025 24.09.2025 ›

Photosphere sunspot drawing and RDS evaluation

23.09.2025 photosphere drawing

High-resolution scan (3229 px)

Time
07:05 UT
Observer
Süleyman FİŞEK
g
13
f
60
R
190
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HS_ – 1Group 1 · HS_ – 1 Group 2 · HS_ – 1Group 2 · HS_ – 1 Group 3 · HH_ – 4Group 3 · HH_ – 4 Group 4 · BXI – 6Group 4 · BXI – 6 Group 5 · AX_ – 1Group 5 · AX_ – 1 Group 6 · EHO – 7Group 6 · EHO – 7 Group 7 · CHI – 10Group 7 · CHI – 10 Group 8 · CSO – 8Group 8 · CSO – 8 Group 9 · CRI – 4Group 9 · CRI – 4 Group 10 · AX_ – 3Group 10 · AX_ – 3 Group 11 · DSO – 4Group 11 · DSO – 4 Group 12 · DSI – 9Group 12 · DSI – 9 Group 13 · DSO – 2Group 13 · DSO – 2
RDS data file (.gzd) 
[Gözlem]
Tarih=23.09.2025
Saat=07:05
Gözlemci=Süleyman FİŞEK
KontrolEden=Korhan YELKENCİ
Durumaçısı=25.25
Enlemaçısı=7.02
Boylamaçısı=173.63
Boylamfark=3
GKalite=3
GDurum=G.T , K.T
Kuzeyaçısı=-0.3
Sırano=20354
AyRasatNo=20
RasatÖnceki=22.09.2025
RasatSonraki=24.09.2025

[Leke Grupları]
Grupsayısı=13:5:8
LekeSayısı=60:13:47
RölatifSayı=190:63:127
01=HS_ 01 +11.347 +73.880 247.510 +0.000 0000 0 +12.100 +74.782 +10.693 +72.978 +11.347 +74.282 +11.347 +73.478
02=HS_ 01 +03.993 +42.327 215.957 +0.000 0000 0 +05.125 +43.428 +02.862 +41.226 +03.993 +42.928 +03.993 +41.726
03=HH_ 04 +10.507 +02.183 175.813 +0.000 0000 0 +11.771 +03.902 +09.243 +00.463 +10.507 +03.403 +10.507 +00.964
04=BXI 06 +07.986 -15.695 157.935 +0.000 0000 0 +09.152 -12.966 +06.821 -18.425 +07.986 -13.166 +07.986 -18.225
05=AX_ 01 +04.506 -50.999 122.631 +0.000 0000 0 +05.265 -50.670 +03.746 -51.932 +04.506 -50.868 +04.506 -51.130
06=EHO 07 -18.770 +72.915 246.545 +0.000 0000 0 -16.472 +80.300 -19.682 +65.530 -18.770 +80.100 -18.770 +65.730
07=CHI 10 -14.562 +37.395 211.250 +0.000 0000 0 -11.881 +39.693 -17.243 +35.980 -14.562 +39.493 -14.562 +35.298
08=CSO 08 -13.440 +25.134 198.764 +0.000 0000 0 -11.865 +29.477 -14.224 +20.791 -13.440 +29.277 -13.440 +20.991
09=CRI 04 -03.638 +21.921 195.551 +0.000 0000 0 -02.116 +23.927 -05.159 +19.915 -03.638 +23.727 -03.638 +20.115
10=AX_ 03 -16.881 +18.148 191.778 +0.000 0000 0 -15.931 +18.398 -17.832 +17.898 -16.881 +17.898 -16.881 +18.398
11=DSO 04 -18.389 -38.150 135.480 +0.000 0000 0 -17.574 -36.392 -19.205 -39.907 -18.389 -36.592 -18.389 -39.707
12=DSI 09 -09.967 -42.915 130.715 +0.000 0000 0 -07.443 -39.302 -12.491 -46.529 -09.967 -39.502 -09.967 -46.329
13=DSO 02 -11.143 -70.460 103.584 +0.000 0000 0 -10.294 -65.990 -11.992 -74.993 -11.143 -65.299 -11.143 -74.793
20250923.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 →

2025/20250923_sf · SF · 6 frames · 128.6 MB · 07:15:09–07:18:08 UT

07:17:38 UT · 30 ms 07:15:09 UT · 30 ms 07:16:38 UT · 30 ms 07:18:08 UT · 60 ms · over-exposed 07:16:08 UT · 60 ms · over-exposed 07:17:08 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.