Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Saturday, 15 August 2026

‹ 14.08.2026 2026 16.08.2026 ›

Photosphere sunspot drawing and RDS evaluation

15.08.2026 photosphere drawing

High-resolution scan (3232 px)

Time
11:00 UT
Observer
Burçin TANIK
g
5
f
34
R
84
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · AX_ – 1Group 1 · AX_ – 1 Group 2 · BXI – 14Group 2 · BXI – 14 Group 3 · DSI – 14Group 3 · DSI – 14 Group 4 · HS_ – 4Group 4 · HS_ – 4 Group 5 · HH_ – 1Group 5 · HH_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=15.08.2026
Saat=11:00
Gözlemci=Burçin TANIK
KontrolEden=Melike ERYILMAZ
Durumaçısı=16.11
Enlemaçısı=6.65
Boylamaçısı=189.04
Boylamfark=1
GKalite=3
GDurum=G.T , B.A
Kuzeyaçısı=-0.5
Sırano=20541
AyRasatNo=14
RasatÖnceki=14.08.2026
RasatSonraki=16.08.2026

[Leke Grupları]
Grupsayısı=5:4:1
LekeSayısı=34:33:1
RölatifSayı=84:73:11
01=AX_ 01 +13.928 +36.834 225.874 -1.000 0000 0 +13.928 +36.834 +13.928 +36.834
02=BXI 14 +12.470 +22.160 211.200 28.842 0000 0 +13.647 +24.453 +10.447 +19.867 +11.379 +23.306 +12.629 +21.360
03=DSI 14 +04.685 +06.331 195.371 10.862 0000 0 +06.556 +11.256 +02.814 +01.405 +05.508 +09.260 +04.183 +02.336
04=HS_ 04 +07.677 -23.866 165.174 -1.000 0000 0 +09.207 -22.901 +06.148 -24.831
05=HH_ 01 -14.681 +73.263 262.303 -1.000 0000 0 -13.843 +75.163 -15.519 +71.363
20260815.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 →

2026/20260815_bto · BTO · 5 frames · 107.1 MB · 11:06:46–11:13:59 UT

11:10:20 UT · 20 ms 11:13:59 UT · 30 ms 11:06:46 UT · 40 ms 11:12:01 UT · 70 ms · over-exposed 11:08:43 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.