Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 23 July 2025

‹ 22.07.2025 2025 24.07.2025 ›

Photosphere sunspot drawing and RDS evaluation

23.07.2025 photosphere drawing

High-resolution scan (3227 px)

Time
07:00 UT
Observer
Burçin TANIK
g
6
f
40
R
100
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HS_ – 1Group 1 · HS_ – 1 Group 2 · EHI – 17Group 2 · EHI – 17 Group 3 · CAI – 13Group 3 · CAI – 13 Group 4 · CAI – 6Group 4 · CAI – 6 Group 5 · AX_ – 2Group 5 · AX_ – 2 Group 6 · AX_ – 1Group 6 · AX_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=23.07.2025
Saat=07:00
Gözlemci=Burçin TANIK
KontrolEden=Süleyman FİŞEK
Durumaçısı=7.3
Enlemaçısı=5.08
Boylamaçısı=272.95
Boylamfark=3
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.3
Sırano=20306
AyRasatNo=20
RasatÖnceki=22.07.2025
RasatSonraki=24.07.2025

[Leke Grupları]
Grupsayısı=6:2:4
LekeSayısı=40:18:22
RölatifSayı=100:38:62
01=HS_ 01 +04.627 +69.248 342.198 +0.000 0000 0 +05.431 +70.394 +03.823 +68.102 +04.627 +69.894 +04.627 +68.602
02=EHI 17 +16.528 -26.257 246.693 07.657 0000 0 +18.813 -19.544 +14.244 -32.970 +18.300 -26.485 +17.300 -31.919
03=CAI 13 -13.469 -25.931 247.190 +0.000 0000 0 -12.252 -21.729 -14.687 -30.134 -13.469 -21.929 -13.469 -29.934
04=CAI 06 -27.502 -52.426 220.524 25.285 0000 0 -25.793 -49.340 -29.212 -55.818 -26.552 -50.506 -28.917 -55.520
05=AX_ 02 -13.554 -65.818 207.132 +0.000 0000 0 -12.816 -65.289 -14.292 -66.346 -13.554 -65.789 -13.554 -65.847
06=AX_ 01 -17.816 -73.954 198.996 -1.000 0000 0 -17.816 -73.954 -17.816 -73.954
20250723.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 →

2025/20250723_bto · BTO · 4 frames · 85.7 MB · 07:10:14–07:14:31 UT

07:13:11 UT · 40 ms 07:10:14 UT · 30 ms 07:11:39 UT · 60 ms · over-exposed 07:14:31 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.