Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Friday, 29 August 2025

‹ 26.08.2025 2025 30.08.2025 ›

Photosphere sunspot drawing and RDS evaluation

29.08.2025 photosphere drawing

High-resolution scan (3230 px)

Time
12:00 UT
Observer
Ergün EGE
g
9
f
91
R
181
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CSI – 6Group 1 · CSI – 6 Group 2 · AX_ – 2Group 2 · AX_ – 2 Group 3 · CKO – 11Group 3 · CKO – 11 Group 4 · HS_ – 1Group 4 · HS_ – 1 Group 5 · HS_ – 1Group 5 · HS_ – 1 Group 6 · DRI – 11Group 6 · DRI – 11 Group 7 · FKC – 51Group 7 · FKC – 51 Group 8 · DSO – 5Group 8 · DSO – 5 Group 9 · CSO – 3Group 9 · CSO – 3 Group 10Group 10
RDS data file (.gzd) 
[Gözlem]
Tarih=29.08.2025
Saat=12:00
Gözlemci=Ergün EGE
KontrolEden=Burçin TANIK
Durumaçısı=20.45
Enlemaçısı=7.15
Boylamaçısı=140.72
Boylamfark=0
GKalite=3
GDurum=B.A , K.T
Kuzeyaçısı=-0.4
Sırano=20333
AyRasatNo=21
RasatÖnceki=26.08.2025
RasatSonraki=30.08.2025

[Leke Grupları]
Grupsayısı=9:5:4
LekeSayısı=91:21:70
RölatifSayı=181:71:110
01=CSI 06 +10.870 +33.270 173.747 +0.000 0000 0 +12.463 +36.125 +09.277 +29.929 +10.870 +35.925 +10.870 +30.129
02=AX_ 02 +10.619 +15.180 155.738 +0.000 0000 0 +11.280 +15.593 +10.210 +14.442 +10.619 +15.256 +10.619 +15.104
03=CKO 11 +04.143 -30.487 110.233 08.902 0000 0 +06.232 -24.860 +02.530 -36.887 +04.379 -27.170 +03.139 -35.116
04=HS_ 01 +16.967 -73.586 067.134 -1.000 0000 0 +17.862 -72.194 +16.730 -74.977
05=HS_ 01 +09.106 -78.651 062.690 -1.000 0000 0 +10.260 -76.883 +07.951 -80.418
06=DRI 11 -08.144 +33.144 173.864 +0.000 0000 0 -07.193 +37.782 -09.940 +28.505 -08.144 +37.582 -08.144 +28.705
07=FKC 51 -16.317 -08.405 132.315 +0.000 0000 0 -10.598 +00.600 -22.350 -16.870 -16.317 -00.140 -16.317 -16.670
08=DSO 05 -20.232 -23.226 117.494 +0.000 0000 0 -19.145 -21.106 -21.320 -25.346 -20.232 -21.306 -20.232 -25.146
09=CSO 03 -15.270 -30.980 110.622 +0.000 0000 0 -13.567 -28.288 -16.488 -31.908 -15.270 -28.488 -15.270 -31.708
20250829.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 →

2025/20250829 · · 8 frames · 171.4 MB · 12:03:25–12:09:49 UT

12:04:24 UT · 40 ms 12:03:25 UT · 40 ms 12:06:17 UT · 50 ms · over-exposed 12:05:39 UT · 50 ms · over-exposed 12:07:26 UT · 60 ms · over-exposed 12:08:03 UT · 60 ms · over-exposed 12:09:11 UT · 70 ms · over-exposed 12:09:49 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.