Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Friday, 31 July 2026

‹ 30.07.2026 2026 01.08.2026 ›

Photosphere sunspot drawing and RDS evaluation

31.07.2026 photosphere drawing

High-resolution scan (3231 px)

Time
10:50 UT
Observer
Tuğba BOZTEPE
g
7
f
45
R
115
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CHO – 2Group 1 · CHO – 2 Group 2 · CHI – 5Group 2 · CHI – 5 Group 3 · CHI – 14Group 3 · CHI – 14 Group 4 · EHI – 16Group 4 · EHI – 16 Group 5 · AX_ – 1Group 5 · AX_ – 1 Group 6 · BXI – 6Group 6 · BXI – 6 Group 7 · AX_ – 1Group 7 · AX_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=31.07.2026
Saat=10:50
Gözlemci=Tuğba BOZTEPE
KontrolEden=
Durumaçısı=10.56
Enlemaçısı=5.72
Boylamaçısı=27.46
Boylamfark=1
GKalite=3
GDurum=G.T , B.A
Kuzeyaçısı=-0.5
Sırano=20527
AyRasatNo=27
RasatÖnceki=30.07.2026
RasatSonraki=1.08.2026

[Leke Grupları]
Grupsayısı=7:4:3
LekeSayısı=45:37:8
RölatifSayı=115:77:38
01=CHO 02 +14.284 +76.359 103.819 +0.000 0000 0 +15.968 +78.484 +12.599 +74.233 +14.284 +78.284 +14.284 +74.433
02=CHI 05 +04.552 +26.609 054.690 +0.000 0000 0 +06.287 +29.506 +02.817 +23.713 +04.552 +29.306 +04.552 +23.913
03=CHI 14 +05.930 -01.229 026.231 +0.000 0000 0 +07.436 +02.446 +02.749 -04.904 +05.930 +02.246 +05.930 -04.704
04=EHI 16 +16.517 -33.695 353.765 +0.000 0000 0 +20.659 -28.119 +12.376 -39.271 +16.517 -28.319 +16.517 -39.710
05=AX_ 01 -05.352 +59.922 087.382 -1.000 0000 0 -05.352 +59.922 -05.352 +59.922
06=BXI 06 -07.200 +05.668 033.128 +0.000 0000 0 -06.205 +07.906 -08.195 +03.431 -07.200 +07.706 -07.200 +03.631
07=AX_ 01 -08.740 -01.553 025.907 -1.000 0000 0 -08.740 -01.553 -08.740 -01.553
20260731.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 →

2026/20260731_tb · TB · 6 frames · 128.6 MB · 11:18:51–11:21:50 UT

11:20:20 UT · 60 ms · over-exposed 11:21:20 UT · 60 ms · over-exposed 11:18:51 UT · 60 ms · over-exposed 11:19:50 UT · 30 ms 11:21:50 UT · 30 ms 11:20:50 UT · 30 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.