Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Thursday, 13 August 2026

‹ 12.08.2026 2026 14.08.2026 ›

Photosphere sunspot drawing and RDS evaluation

13.08.2026 photosphere drawing

High-resolution scan (3230 px)

Time
08:40 UT
Observer
Tuğba BOZTEPE
g
5
f
35
R
85
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · BXI – 4Group 1 · BXI – 4 Group 2 · EKI – 13Group 2 · EKI – 13 Group 3 · DKI – 11Group 3 · DKI – 11 Group 4 · DHO – 2Group 4 · DHO – 2 Group 5 · BXI – 5Group 5 · BXI – 5
RDS data file (.gzd) 
[Gözlem]
Tarih=13.08.2026
Saat=08:40
Gözlemci=Tuğba BOZTEPE
KontrolEden=
Durumaçısı=15.39
Enlemaçısı=6.54
Boylamaçısı=216.76
Boylamfark=2
GKalite=3
GDurum=B.A
Kuzeyaçısı=-0.3
Sırano=20539
AyRasatNo=12
RasatÖnceki=12.08.2026
RasatSonraki=14.08.2026

[Leke Grupları]
Grupsayısı=5:4:1
LekeSayısı=35:30:5
RölatifSayı=85:70:15
01=BXI 04 +10.409 +51.322 268.820 +0.000 0000 0 +11.876 +53.861 +08.941 +48.783 +10.409 +53.661 +10.409 +48.983
02=EKI 13 +12.268 -02.717 214.430 +0.000 0000 0 +13.597 +04.787 +10.940 -10.221 +12.268 +04.587 +12.268 -10.210
03=DKI 11 +05.570 -24.232 192.528 +0.000 0000 0 +07.247 -19.312 +03.893 -29.153 +05.570 -19.512 +05.570 -28.953
04=DHO 02 +08.813 -52.145 164.615 +0.000 0000 0 +10.371 -50.994 +07.255 -53.295 +08.813 -50.404 +08.813 -53.950
05=BXI 05 -17.669 +43.554 260.314 +0.000 0000 0 -16.534 +45.441 -18.804 +41.668 -17.669 +45.241 -17.669 +41.868
20260813.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 →

2026/20260813_tb · TB · 6 frames · 128.6 MB · 09:03:22–09:06:21 UT

09:05:21 UT · 30 ms 09:04:21 UT · 30 ms 09:06:21 UT · 30 ms 09:05:51 UT · 60 ms · over-exposed 09:04:51 UT · 60 ms · over-exposed 09:03:22 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.