Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Monday, 3 August 2026

‹ 02.08.2026 2026 04.08.2026 ›

Photosphere sunspot drawing and RDS evaluation

03.08.2026 photosphere drawing

High-resolution scan (3230 px)

Time
11:55 UT
Observer
Korhan YELKENCİ
g
5
f
42
R
92
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HS_ – 1Group 1 · HS_ – 1 Group 2 · CAI – 7Group 2 · CAI – 7 Group 3 · CAI – 23Group 3 · CAI – 23 Group 4 · CSI – 3Group 4 · CSI – 3 Group 5 · CAI – 8Group 5 · CAI – 8
RDS data file (.gzd) 
[Gözlem]
Tarih=3.08.2026
Saat=11:55
Gözlemci=Korhan YELKENCİ
KontrolEden=Tuğba BOZTEPE
Durumaçısı=11.76
Enlemaçısı=5.94
Boylamaçısı=347.19
Boylamfark=0
GKalite=3
GDurum=B.A
Kuzeyaçısı=-0.3
Sırano=20530
AyRasatNo=3
RasatÖnceki=02.08.2026
RasatSonraki=04.08.2026

[Leke Grupları]
Grupsayısı=5:3:2
LekeSayısı=42:31:11
RölatifSayı=92:61:31
01=HS_ 01 +04.383 +69.351 056.541 +0.000 0000 0 +05.699 +70.323 +03.670 +68.380 +04.383 +69.822 +04.383 +68.880
02=CAI 07 +04.430 +43.431 030.621 +0.000 0000 0 +04.655 +47.325 +03.430 +39.537 +04.430 +46.825 +04.430 +40.370
03=CAI 23 +14.994 +09.199 356.389 49.480 0000 0 +18.555 +12.389 +11.434 +06.800 +18.316 +12.430 +11.634 +06.208
04=CSI 03 -06.158 +46.455 033.645 17.431 0000 0 -05.320 +49.671 -07.283 +43.239 -05.240 +49.816 -07.800 +43.945
05=CAI 08 -05.908 +03.540 350.730 16.390 0000 0 -04.755 +06.666 -07.620 +00.414 -04.994 +06.379 -06.630 +00.678
20260803.gzd

Chromosphere (H-α) FITS frames

No chromosphere observation for this day.

Coronado H-α animations from frame sequences

No Coronado observation for this day.