Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Thursday, 4 September 2025

‹ 03.09.2025 2025 05.09.2025 ›

Photosphere sunspot drawing and RDS evaluation

04.09.2025 photosphere drawing

High-resolution scan (3230 px)

Time
08:50 UT
Observer
Korhan YELKENCİ
g
10
f
70
R
170
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CAI – 10Group 1 · CAI – 10 Group 2 · AX_ – 2Group 2 · AX_ – 2 Group 3 · HS_ – 1Group 3 · HS_ – 1 Group 4 · AX_ – 2Group 4 · AX_ – 2 Group 5 · FAI – 33Group 5 · FAI – 33 Group 6 · DAI – 6Group 6 · DAI – 6 Group 7 · FAC – 11Group 7 · FAC – 11 Group 8 · HS_ – 1Group 8 · HS_ – 1 Group 9 · DAI – 3Group 9 · DAI – 3 Group 10 · HS_ – 1Group 10 · HS_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=4.09.2025
Saat=08:50
Gözlemci=Korhan YELKENCİ
KontrolEden=Korhan YELKENCİ
Durumaçısı=21.91
Enlemaçısı=7.23
Boylamaçısı=63.53
Boylamfark=2
GKalite=3
GDurum=B.A
Kuzeyaçısı=-0.5
Sırano=20337
AyRasatNo=3
RasatÖnceki=03.09.2025
RasatSonraki=05.09.2025

[Leke Grupları]
Grupsayısı=10:6:4
LekeSayısı=70:54:16
RölatifSayı=170:114:56
01=CAI 10 +03.828 +54.556 118.860 36.540 0000 0 +05.928 +57.451 +01.727 +51.661 +05.960 +57.355 +01.748 +51.783
02=AX_ 02 +17.361 +02.901 066.431 +0.000 0000 0 +18.800 +03.416 +16.715 +02.386 +17.361 +02.916 +17.361 +02.886
03=HS_ 01 +08.652 +00.594 064.124 +0.000 0000 0 +09.624 +01.565 +07.680 -00.378 +08.652 +01.660 +08.652 +00.123
04=AX_ 02 +10.709 -17.434 046.960 +0.000 0000 0 +11.786 -16.568 +09.631 -18.301 +00.000 +00.000 +00.000 +00.000
05=FAI 33 +28.567 -20.294 043.236 12.356 0000 0 +30.793 -10.556 +26.341 -30.310 +30.593 -10.962 +26.541 -29.831
06=DAI 06 +08.990 -37.227 026.303 18.152 0000 0 +09.652 -32.979 +06.546 -41.476 +09.391 -33.179 +06.746 -41.276
07=FAC 11 -18.393 +69.552 133.820 15.918 0000 0 -15.417 +78.590 -21.369 +60.515 -16.220 +78.390 -21.169 +60.715
08=HS_ 01 -20.994 +53.769 117.299 +0.000 0000 0 -20.196 +54.762 -21.792 +52.776 -20.994 +54.262 -20.994 +53.276
09=DAI 03 -14.931 +46.910 110.440 23.276 0000 0 -13.788 +49.335 -16.740 +44.484 -13.988 +49.760 -15.874 +44.684
10=HS_ 01 -13.778 -53.529 010.100 +0.000 0000 0 -12.679 -52.150 -14.877 -54.907 -13.778 -52.650 -13.778 -54.408
20250904.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.