Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Friday, 25 July 2025

‹ 24.07.2025 2025 29.07.2025 ›

Photosphere sunspot drawing and RDS evaluation

25.07.2025 photosphere drawing

High-resolution scan (3229 px)

Time
10:35 UT
Observer
Ergün EGE
g
12
f
47
R
167
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · DKI – 9Group 1 · DKI – 9 Group 2 · AX_ – 1Group 2 · AX_ – 1 Group 3 · AX_ – 1Group 3 · AX_ – 1 Group 4 · HR_ – 1Group 4 · HR_ – 1 Group 5 · DRO – 3Group 5 · DRO – 3 Group 6 · HS_ – 1Group 6 · HS_ – 1 Group 7 · AX_ – 2Group 7 · AX_ – 2 Group 8 · DKI – 13Group 8 · DKI – 13 Group 9 · HA_ – 4Group 9 · HA_ – 4 Group 10 · HS_ – 1Group 10 · HS_ – 1 Group 11 · DRI – 10Group 11 · DRI – 10
RDS data file (.gzd) 
[Gözlem]
Tarih=25.07.2025
Saat=10:35
Gözlemci=Ergün EGE
KontrolEden=Ergün EGE
Durumaçısı=8.21
Enlemaçısı=5.26
Boylamaçısı=244.52
Boylamfark=1
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.5
Sırano=20308
AyRasatNo=22
RasatÖnceki=24.07.2025
RasatSonraki=29.07.2025

[Leke Grupları]
Grupsayısı=12:4:8
LekeSayısı=47:12:35
RölatifSayı=167:52:115
01=DKI 09 +15.938 +01.629 246.149 +0.000 0000 0 +17.758 +08.770 +14.119 -04.818 +15.938 +07.877 +15.938 -04.618
02=AX_ 01 +09.382 -16.389 228.131 +0.000 0000 0 +09.750 -15.985 +09.140 -16.794 +09.382 -16.485 +09.382 -16.293
03=AX_ 01 +19.991 -17.482 227.380 +0.000 0000 0 +20.251 -17.830 +19.731 -17.881 +19.991 -17.957 +19.991 -17.700
04=HR_ 01 +10.195 -55.707 188.813 -1.000 0000 0 +10.718 -54.992 +09.673 -56.423
05=DRO 03 -15.788 +51.376 295.896 +0.000 0000 0 -14.266 +53.638 -17.310 +49.113 -15.788 +53.438 -15.788 +49.313
06=HS_ 01 -13.824 +04.950 248.615 -1.000 0000 0 -12.702 +04.890 -14.947 +03.299
07=AX_ 02 -07.204 -13.502 231.180 +0.000 0000 0 -06.318 -12.263 -08.890 -14.741 +00.000 +00.000 +00.000 +00.000
08=DKI 13 -28.587 -27.103 217.417 +0.000 0000 0 -25.809 -21.300 -31.365 -32.907 -28.587 -21.500 -28.587 -32.707
09=HA_ 04 -14.170 -40.455 204.650 -1.000 0000 0 -13.252 -39.219 -14.783 -41.691
10=HS_ 01 -18.626 -49.200 195.320 -1.000 0000 0 -17.531 -48.930 -19.722 -50.307
11=DRI 10 -08.310 -54.593 189.927 +0.000 0000 0 -06.253 -50.187 -10.367 -58.999 -08.310 -50.387 -08.310 -58.799
12=HR_ 01 -07.819 -69.760 174.760 -1.000 0000 0 -07.416 -68.802 -08.222 -70.719
20250725.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 →

2025/20250725 · · 7 frames · 150.0 MB · 10:38:16–10:52:45 UT

10:38:16 UT · 30 ms 10:50:58 UT · 40 ms 10:51:45 UT · 50 ms · over-exposed 10:39:50 UT · 40 ms 10:42:30 UT · 50 ms · over-exposed 10:52:45 UT · 60 ms · over-exposed 10:46:19 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.