Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Monday, 17 November 2025

‹ 15.11.2025 2025 20.11.2025 ›

Photosphere sunspot drawing and RDS evaluation

17.11.2025 photosphere drawing

High-resolution scan (3230 px)

Time
07:30 UT
Observer
Korhan YELKENCİ
g
4
f
24
R
64
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · AX_ – 1Group 1 · AX_ – 1 Group 2 · AX_ – 1Group 2 · AX_ – 1 Group 3 · CAI – 21Group 3 · CAI – 21 Group 4 · AX_ – 1Group 4 · AX_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=17.11.2025
Saat=07:30
Gözlemci=Korhan YELKENCİ
KontrolEden=Korhan YELKENCİ
Durumaçısı=20.67
Enlemaçısı=2.58
Boylamaçısı=167.96
Boylamfark=2
GKalite=3
GDurum=B.A , K.T
Kuzeyaçısı=-0.5
Sırano=20389
AyRasatNo=12
RasatÖnceki=15.11.2025
RasatSonraki=20.11.2025

[Leke Grupları]
Grupsayısı=4:0:4
LekeSayısı=24:0:24
RölatifSayı=64:0:64
01=AX_ 01 -12.142 +36.207 204.167 -1.000 0000 0 -12.142 +36.207 -12.142 +36.207
02=AX_ 01 -18.420 +12.664 180.624 -1.000 0000 0 -18.420 +12.664 -18.420 +12.664
03=CAI 21 -06.246 +07.656 175.616 33.591 0000 0 -04.231 +10.546 -08.262 +04.766 -04.518 +10.317 -08.620 +04.966
04=AX_ 01 -14.360 -77.492 090.468 -1.000 0000 0 -14.360 -77.492 -14.360 -77.492
20251117.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.