Images 18.12.2025 · Istanbul University Observatory Solar Observations

Solar Images Thursday, 18 December 2025

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Photosphere sunspot drawing and RDS evaluation

High-resolution scan (3230 px)

Time: 08:45 UT
Observer: K.YELKENCİ+T.B.
g: 5
f: 11
R: 61
Seeing: 3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CRI – 5

Group 2 · AX_ – 1

Group 3 · HS_ – 1

Group 4 · DAO – 3

Group 5 · HS_ – 1

RDS data file (.gzd)

[Gözlem]
Tarih=18.12.2025
Saat=08:45
Gözlemci=K.YELKENCİ+T.B.
KontrolEden=Korhan YELKENCİ
Durumaçısı=8.57
Enlemaçısı=-1.32
Boylamaçısı=118.75
Boylamfark=2
GKalite=3
GDurum=B.A
Kuzeyaçısı=-0.4
Sırano=20407
AyRasatNo=11
RasatÖnceki=17.12.2025
RasatSonraki=19.12.2025

[Leke Grupları]
Grupsayısı=5:3:2
LekeSayısı=11:7:4
RölatifSayı=61:37:24
01=CRI 05 +03.360 +01.827 120.577 25.240 0000 0 +04.931 +04.852 +01.789 -01.198 +04.731 +04.652 +02.110 -00.976
02=AX_ 01 +10.372 -09.391 109.359 -1.000 0000 0 +10.372 -09.391 +10.372 -09.391
03=HS_ 01 +18.491 -71.235 047.515 +0.000 0000 0 +19.320 -69.840 +17.662 -72.630 +18.491 -70.340 +18.491 -72.130
04=DAO 03 -15.160 +77.889 196.639 19.634 0000 0 -13.370 +83.517 -16.994 +72.261 -13.453 +81.535 -16.536 +72.853
05=HS_ 01 -25.169 +76.110 194.761 -1.000 0000 0 -25.169 +76.110 -25.169 +76.110

20251218.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.