Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Tuesday, 1 September 2026

‹ 31.08.2026 2026 02.09.2026 ›

Photosphere sunspot drawing and RDS evaluation

01.09.2026 photosphere drawing

High-resolution scan (3230 px)

Time
07:10 UT
Observer
Emre YILMAN
g
5
f
21
R
71
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · AX_ – 3Group 1 · AX_ – 3 Group 2 · BXO – 4Group 2 · BXO – 4 Group 3 · HS_ – 1Group 3 · HS_ – 1 Group 4 · AX_ – 2Group 4 · AX_ – 2 Group 5 · CRI – 11Group 5 · CRI – 11
RDS data file (.gzd) 
[Gözlem]
Tarih=1.09.2026
Saat=07:10
Gözlemci=Emre YILMAN
KontrolEden=Melike ERYILMAZ
Durumaçısı=21.1
Enlemaçısı=7.19
Boylamaçısı=326.51
Boylamfark=3
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.4
Sırano=20556
AyRasatNo=1
RasatÖnceki=31.08.2026
RasatSonraki=02.09.2026

[Leke Grupları]
Grupsayısı=5:4:1
LekeSayısı=21:10:11
RölatifSayı=71:50:21
01=AX_ 03 +08.650 +24.189 350.699 +0.000 0000 0 +08.747 +24.946 +07.383 +23.432 +08.650 +24.446 +08.650 +23.932
02=BXO 04 +14.320 +17.305 343.815 +0.000 0000 0 +14.624 +19.127 +13.441 +15.484 +14.320 +18.627 +14.320 +15.984
03=HS_ 01 +08.308 -63.222 263.288 +0.000 0000 0 +09.437 -62.170 +07.179 -64.427 +08.308 -62.593 +08.308 -63.851
04=AX_ 02 +09.176 -74.350 252.160 +0.000 0000 0 +09.797 -72.916 +08.555 -75.784 +09.176 -73.416 +09.176 -75.284
05=CRI 11 -10.740 +10.900 336.519 +0.000 0000 0 -09.416 +13.530 -12.650 +06.965 -10.740 +12.853 -10.740 +07.165
20260901.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 →

2026/20260901_ey · EY · 6 frames · 128.6 MB · 07:26:14–07:29:14 UT

07:28:14 UT · 30 ms 07:29:14 UT · 30 ms 07:27:13 UT · 30 ms 07:28:43 UT · 60 ms · over-exposed 07:27:43 UT · 60 ms · over-exposed 07:26:14 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.