Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 12 August 2026

‹ 11.08.2026 2026 13.08.2026 ›

Photosphere sunspot drawing and RDS evaluation

12.08.2026 photosphere drawing

High-resolution scan (3231 px)

Time
07:50 UT
Observer
Tuğba BOZTEPE
g
5
f
37
R
87
Seeing
4 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · AX_ – 3Group 1 · AX_ – 3 Group 2 · BXI – 12Group 2 · BXI – 12 Group 3 · BXI – 13Group 3 · BXI – 13 Group 4 · HH_ – 2Group 4 · HH_ – 2 Group 5 · AX_ – 7Group 5 · AX_ – 7
RDS data file (.gzd) 
[Gözlem]
Tarih=12.08.2026
Saat=07:50
Gözlemci=Tuğba BOZTEPE
KontrolEden=Tuğba BOZTEPE
Durumaçısı=15.03
Enlemaçısı=6.49
Boylamaçısı=230.44
Boylamfark=2
GKalite=4
GDurum=G.T
Kuzeyaçısı=-0.5
Sırano=20538
AyRasatNo=11
RasatÖnceki=11.08.2026
RasatSonraki=13.08.2026

[Leke Grupları]
Grupsayısı=5:4:1
LekeSayısı=37:30:7
RölatifSayı=87:70:17
01=AX_ 03 +11.146 +35.838 266.278 +0.000 0000 0 +11.593 +37.420 +10.700 +34.635 +11.146 +36.731 +11.146 +34.945
02=BXI 12 +11.645 -21.347 209.930 +0.000 0000 0 +13.364 -14.770 +09.926 -28.618 +11.645 -14.277 +11.645 -28.418
03=BXI 13 +03.898 -39.159 191.281 +0.000 0000 0 +05.148 -35.914 +02.648 -42.403 +03.898 -36.114 +03.898 -42.203
04=HH_ 02 +06.543 -66.330 164.110 +0.000 0000 0 +08.150 -64.341 +05.700 -68.319 +06.543 -64.841 +06.543 -67.819
05=AX_ 07 -16.256 +29.427 259.867 +0.000 0000 0 -15.148 +30.607 -17.365 +28.247 +00.000 +00.000 +00.000 +00.000
20260812.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 →

2026/20260812_tb · TB · 6 frames · 128.6 MB · 08:18:43–08:21:43 UT

08:21:43 UT · 30 ms 08:19:43 UT · 30 ms 08:20:43 UT · 30 ms 08:21:13 UT · 60 ms · over-exposed 08:18:43 UT · 60 ms · over-exposed 08:20:13 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.