Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Sunday, 28 June 2026

‹ 27.06.2026 2026 29.06.2026 ›

Photosphere sunspot drawing and RDS evaluation

28.06.2026 photosphere drawing

High-resolution scan (3230 px)

Time
11:15 UT
Observer
Süleyman FİŞEK
g
6
f
90
R
150
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · AX_ – 2Group 1 · AX_ – 2 Group 2 · DAC – 21Group 2 · DAC – 21 Group 3 · DSI – 24Group 3 · DSI – 24 Group 4 · DSC – 11Group 4 · DSC – 11 Group 5 · BXI – 10Group 5 · BXI – 10 Group 6 · FKC – 22Group 6 · FKC – 22
RDS data file (.gzd) 
[Gözlem]
Tarih=28.06.2026
Saat=11:15
Gözlemci=Süleyman FİŞEK
KontrolEden=İrem ÖZDEMİR
Durumaçısı=-3.85
Enlemaçısı=2.55
Boylamaçısı=103.9
Boylamfark=0
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.5
Sırano=20498
AyRasatNo=22
RasatÖnceki=27.06.2026
RasatSonraki=29.06.2026

[Leke Grupları]
Grupsayısı=6:2:4
LekeSayısı=90:23:67
RölatifSayı=150:43:107
01=AX_ 02 +07.936 +46.643 150.543 +0.000 0000 0 +08.570 +46.961 +07.302 +46.324 +07.936 +46.462 +07.936 +46.825
02=DAC 21 +14.540 -12.803 091.970 +0.000 0000 0 +17.420 -08.533 +11.660 -17.720 +14.540 -08.733 +14.540 -16.872
03=DSI 24 -08.857 +25.214 129.114 +0.000 0000 0 -06.610 +28.629 -11.104 +21.799 -08.857 +28.429 -08.857 +21.999
04=DSC 11 -17.223 -05.975 097.925 +0.000 0000 0 -14.688 -02.578 -19.759 -09.373 -17.223 -02.778 -17.223 -09.173
05=BXI 10 -13.815 -12.444 091.456 +0.000 0000 0 -10.725 -15.362 -16.905 -09.526 -13.815 -09.726 -13.815 -15.162
06=FKC 22 -05.763 -30.895 073.500 +0.000 0000 0 -02.126 -22.537 -09.400 -39.252 -05.763 -22.737 -05.763 -39.520
20260628.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 →

2026/20260628_sf · SF · 7 frames · 150.0 MB · 11:26:50–11:30:36 UT

11:27:20 UT · 30 ms 11:30:36 UT · 30 ms 11:29:35 UT · 30 ms 11:30:06 UT · 30 ms 11:26:50 UT · 60 ms · over-exposed 11:28:20 UT · 60 ms · over-exposed 11:27:50 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.