Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Thursday, 20 November 2025

‹ 17.11.2025 2025 21.11.2025 ›

Photosphere sunspot drawing and RDS evaluation

20.11.2025 photosphere drawing

High-resolution scan (3230 px)

Time
07:40 UT
Observer
Korhan YELKENCİ
g
4
f
20
R
60
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HS_ – 1Group 1 · HS_ – 1 Group 2 · AX_ – 1Group 2 · AX_ – 1 Group 3 · CAI – 17Group 3 · CAI – 17 Group 4 · AX_ – 1Group 4 · AX_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=20.11.2025
Saat=07:40
Gözlemci=Korhan YELKENCİ
KontrolEden=Ergün EGE
Durumaçısı=19.76
Enlemaçısı=2.22
Boylamaçısı=128.32
Boylamfark=2
GKalite=3
GDurum=B.A
Kuzeyaçısı=-0.4
Sırano=20390
AyRasatNo=13
RasatÖnceki=17.11.2025
RasatSonraki=21.11.2025

[Leke Grupları]
Grupsayısı=4:2:2
LekeSayısı=20:2:18
RölatifSayı=60:22:38
01=HS_ 01 +01.834 -62.938 065.382 +0.000 0000 0 +02.470 -61.992 +01.198 -63.883 +01.834 -62.493 +01.834 -63.383
02=AX_ 01 +16.700 -84.924 043.396 +0.000 0000 0 +17.950 -82.513 +16.306 -87.335 +16.700 -83.130 +16.700 -86.835
03=CAI 17 -06.808 +47.991 176.311 24.805 0000 0 -04.852 +52.200 -08.763 +43.963 -05.520 +51.811 -08.563 +44.181
04=AX_ 01 -23.630 +10.584 138.904 -1.000 0000 0 -23.630 +10.584 -23.630 +10.584
20251120.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.