Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Tuesday, 25 November 2025

‹ 24.11.2025 2025 27.11.2025 ›

Photosphere sunspot drawing and RDS evaluation

25.11.2025 photosphere drawing

High-resolution scan (3230 px)

Time
07:45 UT
Observer
Süleyman FİŞEK
g
7
f
28
R
98
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HS_ – 1Group 1 · HS_ – 1 Group 2 · CSI – 6Group 2 · CSI – 6 Group 3 · AX_ – 1Group 3 · AX_ – 1 Group 4 · DSI – 5Group 4 · DSI – 5 Group 5 · AX_ – 1Group 5 · AX_ – 1 Group 6 · CSO – 3Group 6 · CSO – 3
RDS data file (.gzd) 
[Gözlem]
Tarih=25.11.2025
Saat=07:45
Gözlemci=Süleyman FİŞEK
KontrolEden=Korhan YELKENCİ
Durumaçısı=18.1
Enlemaçısı=1.61
Boylamaçısı=62.38
Boylamfark=2
GKalite=3
GDurum=G.T , K.T
Kuzeyaçısı=-0.8
Sırano=20394
AyRasatNo=17
RasatÖnceki=24.11.2025
RasatSonraki=27.11.2025

[Leke Grupları]
Grupsayısı=7:3:4
LekeSayısı=28:8:20
RölatifSayı=98:38:60
01=HS_ 01 +01.810 +02.774 065.154 -1.000 0000 0 +02.332 +03.151 +01.288 +02.397
02=CSI 06 +18.101 -19.870 043.293 +0.000 0000 0 +20.298 -17.235 +15.903 -20.939 +18.101 -17.435 +18.101 -20.739
03=AX_ 01 +08.146 -40.580 022.322 +0.000 0000 0 +08.446 -39.653 +07.845 -40.463 +08.146 -40.675 +08.146 -40.485
04=DSI 05 -15.807 +22.469 084.849 +0.000 0000 0 -14.432 +25.588 -17.181 +19.350 -15.807 +25.388 -15.807 +19.550
05=AX_ 01 -01.772 -05.994 056.386 -1.000 0000 0 -01.772 -05.994 -01.772 -05.994
06=CSO 03 -09.550 -28.270 034.353 +0.000 0000 0 -07.975 -25.681 -10.135 -30.373 -09.550 -25.881 -09.550 -30.173
07=DKC 11 -12.710 -37.104 025.276 +0.000 0000 0 -10.929 -31.754 -14.492 -42.455 -12.710 -31.954 -12.710 -42.255
20251125.gzd

Chromosphere (H-α) FITS frames

H-α

The images are made automatically with a fixed, gentle rule: uneven illumination and most of the limb darkening are removed, and the brightness is shown on a linear scale (no sharpening); prominences get their own scale outside the limb. Frames are ordered by sharpness (seeing); frames without the Sun (darks, bias) come last. Method →

2025/20251125_sf · SF · 6 frames · 128.6 MB · 08:39:36–08:42:37 UT

08:41:06 UT · 30 ms 08:39:36 UT · 30 ms 08:42:07 UT · 30 ms 08:40:36 UT · 60 ms · over-exposed 08:41:36 UT · 60 ms · over-exposed 08:42:37 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.