Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Thursday, 27 August 2026

‹ 26.08.2026 2026 28.08.2026 ›

Photosphere sunspot drawing and RDS evaluation

27.08.2026 photosphere drawing

High-resolution scan (3234 px)

Time
09:00 UT
Observer
Burçin TANIK
g
4
f
23
R
63
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · DSC – 9Group 1 · DSC – 9 Group 2 · DAC – 11Group 2 · DAC – 11 Group 3 · AX_ – 1Group 3 · AX_ – 1 Group 4 · HA_ – 2Group 4 · HA_ – 2
RDS data file (.gzd) 
[Gözlem]
Tarih=27.08.2026
Saat=09:00
Gözlemci=Burçin TANIK
KontrolEden=Burçin TANIK
Durumaçısı=19.79
Enlemaçısı=7.09
Boylamaçısı=31.56
Boylamfark=2
GKalite=3
GDurum=B.A
Kuzeyaçısı=-0.2
Sırano=20552
AyRasatNo=25
RasatÖnceki=26.08.2026
RasatSonraki=28.08.2026

[Leke Grupları]
Grupsayısı=4:3:1
LekeSayısı=23:21:2
RölatifSayı=63:51:12
01=DSC 09 +09.651 +35.129 066.689 11.934 0000 0 +11.254 +40.395 +08.490 +29.863 +09.320 +37.822 +10.373 +31.462
02=DAC 11 +03.610 +20.401 051.961 26.619 0000 0 +05.314 +24.296 +00.808 +16.507 +04.118 +22.680 +01.891 +18.230
03=AX_ 01 +26.568 -46.716 344.844 -1.000 0000 0 +26.568 -46.716 +26.568 -46.716
04=HA_ 02 -06.730 +06.813 038.373 +0.000 0000 0 -06.236 +07.262 -07.224 +06.364 -06.730 +06.762 -06.730 +06.864
20260827.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 →

2026/20260827_bto · BTO · 4 frames · 85.7 MB · 09:04:48–09:13:48 UT

09:04:48 UT · 20 ms 09:07:48 UT · 30 ms 09:13:48 UT · 40 ms 09:12:19 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.