Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Thursday, 3 September 2026

‹ 02.09.2026 2026 04.09.2026 ›

Photosphere sunspot drawing and RDS evaluation

03.09.2026 photosphere drawing

High-resolution scan (3230 px)

Time
07:30 UT
Observer
Emre YILMAN
g
3
f
9
R
39
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HK_ – 2Group 1 · HK_ – 2 Group 2 · CAO – 6Group 2 · CAO – 6 Group 3 · HH_ – 1Group 3 · HH_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=3.09.2026
Saat=07:30
Gözlemci=Emre YILMAN
KontrolEden=Süleyman FİŞEK
Durumaçısı=21.6
Enlemaçısı=7.22
Boylamaçısı=299.91
Boylamfark=2
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.6
Sırano=20558
AyRasatNo=3
RasatÖnceki=02.09.2026
RasatSonraki=04.09.2026

[Leke Grupları]
Grupsayısı=3:3:0
LekeSayısı=9:9:0
RölatifSayı=39:39:0
01=HK_ 02 +08.662 -37.110 262.469 +0.000 0000 0 +10.154 -35.746 +07.171 -38.276 +08.662 -36.345 +08.662 -37.875
02=CAO 06 +09.569 -46.396 253.840 +0.000 0000 0 +10.652 -44.607 +08.486 -48.186 +09.569 -44.807 +09.569 -47.986
03=HH_ 01 +10.260 -80.943 218.537 +0.000 0000 0 +11.229 -77.664 +09.291 -84.221 +10.260 -78.164 +10.260 -83.722
20260903.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 →

2026/20260903_ey · EY · 6 frames · 128.6 MB · 07:43:12–07:46:13 UT

07:44:12 UT · 30 ms 07:46:13 UT · 30 ms 07:45:13 UT · 30 ms 07:43:12 UT · 60 ms · over-exposed 07:44:42 UT · 60 ms · over-exposed 07:45:43 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.