Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Friday, 7 August 2026

‹ 06.08.2026 2026 08.08.2026 ›

Photosphere sunspot drawing and RDS evaluation

07.08.2026 photosphere drawing

High-resolution scan (3229 px)

Time
08:45 UT
Observer
Emre YILMAN
g
3
f
10
R
40
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CAO – 4Group 1 · CAO – 4 Group 2 · CRO – 3Group 2 · CRO – 3 Group 3 · BXO – 3Group 3 · BXO – 3
RDS data file (.gzd) 
[Gözlem]
Tarih=7.08.2026
Saat=08:45
Gözlemci=Emre YILMAN
KontrolEden=Korhan YELKENCİ
Durumaçısı=13.23
Enlemaçısı=6.19
Boylamaçısı=296.04
Boylamfark=2
GKalite=3
GDurum=
Kuzeyaçısı=-0.4
Sırano=20534
AyRasatNo=7
RasatÖnceki=06.08.2026
RasatSonraki=08.08.2026

[Leke Grupları]
Grupsayısı=3:1:2
LekeSayısı=10:4:6
RölatifSayı=40:14:26
01=CAO 04 +15.790 +59.773 355.813 +0.000 0000 0 +18.431 +61.610 +13.149 +57.935 +15.790 +61.410 +15.790 +58.135
02=CRO 03 -07.388 +57.347 353.387 +0.000 0000 0 -06.248 +61.905 -08.528 +52.790 -07.388 +61.705 -07.388 +52.990
03=BXO 03 -15.593 -36.663 259.377 +0.000 0000 0 -14.798 -40.720 -16.389 -33.253 -15.593 -33.429 -15.593 -39.896
20260807.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 →

2026/20260807_ey · EY · 6 frames · 128.6 MB · 09:05:45–09:08:45 UT

09:06:45 UT · 30 ms 09:07:45 UT · 30 ms 09:08:45 UT · 30 ms 09:05:45 UT · 60 ms · over-exposed 09:07:15 UT · 60 ms · over-exposed 09:08:15 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.