Images 20.10.2026 · Istanbul University Observatory Solar Observations

Solar Images Tuesday, 20 October 2026

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Photosphere sunspot drawing and RDS evaluation

High-resolution scan (3230 px)

Time: 09:15 UT
Observer: Emre YILMAN
g: 5
f: 52
R: 102
Seeing: 3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CSI – 26

Group 2 · BXI – 20

Group 3 · HK_ – 4

Group 4 · AX_ – 1

Group 5 · HS_ – 1

RDS data file (.gzd)

[Gözlem]
Tarih=20.10.2026
Saat=09:15
Gözlemci=Emre YILMAN
KontrolEden=Emre YILMAN
Durumaçısı=25.88
Enlemaçısı=5.48
Boylamaçısı=38.65
Boylamfark=2
GKalite=3
GDurum=H.S
Kuzeyaçısı=-0.3
Sırano=20591
AyRasatNo=14
RasatÖnceki=18.10.2026
RasatSonraki=21.10.2026

[Leke Grupları]
Grupsayısı=5:2:3
LekeSayısı=52:46:6
RölatifSayı=102:66:36
01=CSI 26 +06.302 +30.671 069.321 +0.000 0000 0 +08.240 +36.690 +04.363 +25.272 +06.302 +35.869 +06.302 +25.472
02=BXI 20 +13.279 +04.950 043.600 +0.000 0000 0 +15.423 +08.862 +11.136 +01.370 +13.279 +08.662 +13.279 +01.237
03=HK_ 04 -15.464 +65.371 104.210 +0.000 0000 0 -14.126 +68.290 -16.803 +62.714 -15.464 +67.659 -15.464 +63.830
04=AX_ 01 -17.317 +57.762 096.412 -1.000 0000 0 -17.317 +57.762 -17.317 +57.762
05=HS_ 01 -16.541 +56.500 094.700 +0.000 0000 0 -15.839 +56.931 -17.243 +55.168 -16.541 +56.882 -16.541 +56.118

20261020.gzd

Chromosphere (H-α) FITS frames

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 →

2026/20261020_ey · EY · 8 frames · 171.4 MB · 10:54:50–10:58:50 UT

Coronado H-α animations from frame sequences

No Coronado observation for this day.