Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Sunday, 12 July 2026

‹ 11.07.2026 2026 13.07.2026 ›

Photosphere sunspot drawing and RDS evaluation

12.07.2026 photosphere drawing

High-resolution scan (3230 px)

Time
07:55 UT
Observer
Melike ERYILMAZ
g
8
f
21
R
101
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · AX_ – 1Group 1 · AX_ – 1 Group 2 · BXI – 5Group 2 · BXI – 5 Group 3 · AX_ – 1Group 3 · AX_ – 1 Group 4 · AX_ – 1Group 4 · AX_ – 1 Group 5 · AX_ – 1Group 5 · AX_ – 1 Group 6 · EKI – 4Group 6 · EKI – 4 Group 7 · CKO – 7Group 7 · CKO – 7
RDS data file (.gzd) 
[Gözlem]
Tarih=12.07.2026
Saat=07:55
Gözlemci=Melike ERYILMAZ
KontrolEden=Burçin TANIK
Durumaçısı=2.41
Enlemaçısı=4.03
Boylamaçısı=280.44
Boylamfark=2
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.5
Sırano=20510
AyRasatNo=10
RasatÖnceki=11.07.2026
RasatSonraki=13.07.2026

[Leke Grupları]
Grupsayısı=8:5:3
LekeSayısı=21:9:12
RölatifSayı=101:59:42
01=AX_ 01 +04.479 +19.899 300.340 -1.000 0000 0 +04.479 +19.899 +04.479 +19.899
02=BXI 05 +08.956 +17.977 298.417 +0.000 0000 0 +10.106 +20.555 +07.806 +15.399 +08.956 +20.355 +08.956 +15.599
03=AX_ 01 +21.373 +16.386 296.826 -1.000 0000 0 +21.373 +16.386 +21.373 +16.386
04=AX_ 01 +23.857 +13.488 293.928 -1.000 0000 0 +23.857 +13.488 +23.857 +13.488
05=AX_ 01 +24.959 -04.189 276.251 -1.000 0000 0 +24.959 -04.189 +24.959 -04.189
06=EKI 04 -11.200 +71.227 351.667 +0.000 0000 0 -08.253 +76.876 -14.146 +65.577 -11.200 +76.676 -11.200 +65.777
07=CKO 07 -09.820 +20.108 300.548 +0.000 0000 0 -06.787 +22.724 -11.378 +17.492 -09.820 +22.524 -09.820 +17.692
08=AX_ 01 -05.417 +18.280 298.720 -1.000 0000 0 -05.417 +18.280 -05.417 +18.280
20260712.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 →

2026/20260712_me · ME · 6 frames · 128.6 MB · 08:07:41–08:10:11 UT

08:07:41 UT · 60 ms · over-exposed 08:08:41 UT · 60 ms · over-exposed 08:09:41 UT · 60 ms · over-exposed 08:10:11 UT · 30 ms 08:09:11 UT · 30 ms 08:08:11 UT · 30 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.