Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Sunday, 21 September 2025

‹ 20.09.2025 2025 22.09.2025 ›

Photosphere sunspot drawing and RDS evaluation

21.09.2025 photosphere drawing

High-resolution scan (3229 px)

Time
09:55 UT
Observer
Süleyman FİŞEK
g
12
f
72
R
192
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CSI – 6Group 1 · CSI – 6 Group 2 · AX_ – 1Group 2 · AX_ – 1 Group 3 · HS_ – 2Group 3 · HS_ – 2 Group 4 · DHI – 7Group 4 · DHI – 7 Group 5 · HH_ – 1Group 5 · HH_ – 1 Group 6 · DKC – 16Group 6 · DKC – 16 Group 7 · AX_ – 2Group 7 · AX_ – 2 Group 8 · EKO – 19Group 8 · EKO – 19 Group 9 · DSI – 11Group 9 · DSI – 11 Group 10 · AX_ – 1Group 10 · AX_ – 1 Group 11 · DSO – 2Group 11 · DSO – 2 Group 12 · DSI – 4Group 12 · DSI – 4 Group 13Group 13
RDS data file (.gzd) 
[Gözlem]
Tarih=21.09.2025
Saat=09:55
Gözlemci=Süleyman FİŞEK
KontrolEden=Süleyman FİŞEK
Durumaçısı=25.02
Enlemaçısı=7.08
Boylamaçısı=198.47
Boylamfark=1
GKalite=3
GDurum=B.A , K.T
Kuzeyaçısı=-0.8
Sırano=20352
AyRasatNo=18
RasatÖnceki=20.09.2025
RasatSonraki=22.09.2025

[Leke Grupları]
Grupsayısı=12:5:7
LekeSayısı=72:17:55
RölatifSayı=192:67:125
01=CSI 06 +10.971 +48.788 247.258 +0.000 0000 0 +12.135 +51.392 +09.808 +46.185 +10.971 +51.192 +10.971 +46.385
02=AX_ 01 +15.248 +38.480 236.518 -1.000 0000 0 +15.248 +38.480 +15.248 +38.480
03=HS_ 02 +03.760 +17.240 215.710 -1.000 0000 0 +04.753 +18.349 +02.768 +16.131
04=DHI 07 +10.266 -22.871 175.599 +0.000 0000 0 +12.294 -20.873 +08.238 -24.868 +10.266 -21.730 +10.266 -24.668
05=HH_ 01 +04.474 -77.152 121.318 -1.000 0000 0 +05.244 -75.887 +03.703 -78.418
06=DKC 16 -17.794 +47.229 245.699 +0.000 0000 0 -15.799 +53.118 -19.789 +41.340 -17.794 +52.918 -17.794 +41.540
07=AX_ 02 -24.230 +13.327 211.797 +0.000 0000 0 -23.551 +13.916 -24.909 +12.738 -24.230 +13.416 -24.230 +13.238
08=EKO 19 -15.394 +08.695 207.165 18.690 0000 0 -12.110 +15.490 -18.678 +01.900 -14.811 +12.512 -17.809 +03.607
09=DSI 11 -13.430 -01.229 197.241 +0.000 0000 0 -12.900 +01.742 -14.780 -04.199 -13.430 +01.542 -13.430 -03.999
10=AX_ 01 -16.294 -05.734 192.736 -1.000 0000 0 -16.294 -05.734 -16.294 -05.734
11=DSO 02 -17.465 -62.779 135.691 +0.000 0000 0 -16.741 -60.831 -18.188 -64.728 -17.465 -61.330 -17.465 -64.228
12=DSI 04 -08.867 -67.836 130.634 +0.000 0000 0 -07.360 -64.496 -10.698 -71.176 -08.867 -64.696 -08.867 -70.976
20250921.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.