Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Tuesday, 11 August 2026

‹ 10.08.2026 2026 12.08.2026 ›

Photosphere sunspot drawing and RDS evaluation

11.08.2026 photosphere drawing

High-resolution scan (3230 px)

Time
08:15 UT
Observer
Tuğba BOZTEPE
g
2
f
4
R
24
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · BXO – 2Group 1 · BXO – 2 Group 2 · AX_ – 2Group 2 · AX_ – 2
RDS data file (.gzd) 
[Gözlem]
Tarih=11.08.2026
Saat=08:15
Gözlemci=Tuğba BOZTEPE
KontrolEden=Tuğba BOZTEPE
Durumaçısı=14.69
Enlemaçısı=6.43
Boylamaçısı=243.43
Boylamfark=2
GKalite=3
GDurum=G.T , B.A
Kuzeyaçısı=-0.5
Sırano=20537
AyRasatNo=10
RasatÖnceki=10.08.2026
RasatSonraki=12.08.2026

[Leke Grupları]
Grupsayısı=2:1:1
LekeSayısı=4:2:2
RölatifSayı=24:12:12
01=BXO 02 +08.731 -76.868 166.562 +0.000 0000 0 +10.226 -74.738 +07.236 -78.998 +08.731 -74.938 +08.731 -78.798
02=AX_ 02 -12.897 +20.328 263.758 +0.000 0000 0 -12.350 +21.486 -13.444 +19.170 -12.897 +20.986 -12.897 +19.670
20260811.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 →

2026/20260811_tb · TB · 6 frames · 128.6 MB · 08:36:15–08:39:14 UT

08:37:14 UT · 30 ms 08:38:14 UT · 30 ms 08:39:14 UT · 30 ms 08:36:15 UT · 60 ms · over-exposed 08:37:44 UT · 60 ms · over-exposed 08:38:44 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.