Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 15 July 2026

‹ 14.07.2026 2026 17.07.2026 ›

Photosphere sunspot drawing and RDS evaluation

15.07.2026 photosphere drawing

High-resolution scan (3230 px)

Time
08:15 UT
Observer
Melike ERYILMAZ
g
2
f
3
R
23
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HH_ – 2Group 1 · HH_ – 2 Group 2 · HH_ – 1Group 2 · HH_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=15.07.2026
Saat=08:15
Gözlemci=Melike ERYILMAZ
KontrolEden=Melike ERYILMAZ
Durumaçısı=3.75
Enlemaçısı=4.33
Boylamaçısı=240.56
Boylamfark=2
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.3
Sırano=20513
AyRasatNo=13
RasatÖnceki=14.07.2026
RasatSonraki=17.07.2026

[Leke Grupları]
Grupsayısı=2:0:2
LekeSayısı=3:0:3
RölatifSayı=23:0:23
01=HH_ 02 -08.989 +60.122 300.682 +0.000 0000 0 -07.740 +62.926 -10.904 +57.317 -08.989 +62.427 -08.989 +57.818
02=HH_ 01 -06.752 -47.759 192.801 +0.000 0000 0 -05.326 -45.972 -08.177 -49.545 -06.752 -46.472 -06.752 -49.450
20260715.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 →

2026/20260715_me · ME · 6 frames · 128.6 MB · 08:27:44–08:30:14 UT

08:28:44 UT · 60 ms · over-exposed 08:27:44 UT · 60 ms · over-exposed 08:29:44 UT · 60 ms · over-exposed 08:29:14 UT · 30 ms 08:30:14 UT · 30 ms 08:28:14 UT · 30 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.