Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Friday, 28 August 2026

‹ 27.08.2026 2026 30.08.2026 ›

Photosphere sunspot drawing and RDS evaluation

28.08.2026 photosphere drawing

High-resolution scan (3229 px)

Time
07:00 UT
Observer
Burçin TANIK
g
6
f
21
R
81
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · ESO – 6Group 1 · ESO – 6 Group 2 · DSC – 7Group 2 · DSC – 7 Group 3 · BXO – 4Group 3 · BXO – 4 Group 4 · AX_ – 1Group 4 · AX_ – 1 Group 5 · HS_ – 1Group 5 · HS_ – 1 Group 6 · AX_ – 2Group 6 · AX_ – 2
RDS data file (.gzd) 
[Gözlem]
Tarih=28.08.2026
Saat=07:00
Gözlemci=Burçin TANIK
KontrolEden=Melike ERYILMAZ
Durumaçısı=20.05
Enlemaçısı=7.11
Boylamaçısı=19.45
Boylamfark=3
GKalite=3
GDurum=B.A
Kuzeyaçısı=-1.1
Sırano=20553
AyRasatNo=26
RasatÖnceki=27.08.2026
RasatSonraki=30.08.2026

[Leke Grupları]
Grupsayısı=6:4:2
LekeSayısı=21:18:3
RölatifSayı=81:58:23
01=ESO 06 +10.997 +46.860 066.310 +0.000 0000 0 +12.498 +52.160 +09.497 +41.559 +10.997 +51.960 +10.997 +41.759
02=DSC 07 +04.605 +32.672 052.122 38.641 0000 0 +06.827 +35.268 +02.383 +30.760 +06.500 +34.226 +03.350 +30.506
03=BXO 04 +08.656 -29.119 350.331 14.547 0000 0 +09.880 -25.581 +07.432 -32.657 +08.800 -27.783 +09.320 -31.733
04=AX_ 01 +27.532 -37.440 342.406 -1.000 0000 0 +27.532 -37.440 +27.532 -37.440
05=HS_ 01 -05.580 +17.469 036.919 +0.000 0000 0 -04.482 +18.200 -05.633 +16.919 -05.580 +17.609 -05.580 +17.329
06=AX_ 02 -11.313 -45.200 334.250 +0.000 0000 0 -10.731 -44.225 -11.895 -46.174 -11.313 -44.726 -11.313 -45.674
20260828.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 →

2026/20260828_bto · BTO · 4 frames · 85.7 MB · 07:00:50–07:13:23 UT

2026/28082026_bto · BTO · 4 frames · 85.7 MB · 07:00:50–07:13:23 UT

07:02:43 UT · 20 ms 07:02:43 UT · 20 ms 07:04:41 UT · 30 ms 07:04:41 UT · 30 ms 07:13:23 UT · 40 ms 07:13:23 UT · 40 ms 07:00:50 UT · 70 ms · over-exposed 07:00:50 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.