Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 29 October 2025

‹ 27.10.2025 2025 30.10.2025 ›

Photosphere sunspot drawing and RDS evaluation

29.10.2025 photosphere drawing

High-resolution scan (3231 px)

Time
11:15 UT
Observer
Burçin TANIK
g
6
f
19
R
79
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CAI – 8Group 1 · CAI – 8 Group 2 · CHO – 6Group 2 · CHO – 6 Group 3 · AX_ – 1Group 3 · AX_ – 1 Group 4 · AX_ – 1Group 4 · AX_ – 1 Group 5 · HS_ – 1Group 5 · HS_ – 1 Group 6 · AX_ – 2Group 6 · AX_ – 2
RDS data file (.gzd) 
[Gözlem]
Tarih=29.10.2025
Saat=11:15
Gözlemci=Burçin TANIK
KontrolEden=Korhan YELKENCİ
Durumaçısı=24.84
Enlemaçısı=4.64
Boylamaçısı=56.41
Boylamfark=0
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.5
Sırano=20375
AyRasatNo=18
RasatÖnceki=27.10.2025
RasatSonraki=30.10.2025

[Leke Grupları]
Grupsayısı=6:2:4
LekeSayısı=19:14:5
RölatifSayı=79:34:45
01=CAI 08 +16.810 +29.577 085.987 +0.000 0000 0 +17.916 +33.149 +15.703 +26.500 +16.810 +32.949 +16.810 +26.205
02=CHO 06 +02.901 +04.248 060.658 34.140 0000 0 +04.919 +06.685 +00.882 +01.811 +03.739 +05.490 +01.797 +02.609
03=AX_ 01 -13.100 +83.104 139.514 -1.000 0000 0 -13.100 +83.104 -13.100 +83.104
04=AX_ 01 -09.401 +81.209 137.619 -1.000 0000 0 -09.401 +81.209 -09.401 +81.209
05=HS_ 01 -04.937 +46.541 102.951 +0.000 0000 0 -04.374 +47.630 -05.501 +46.180 -04.937 +46.766 -04.937 +46.316
06=AX_ 02 -11.463 +07.150 063.425 +0.000 0000 0 -11.720 +07.444 -11.855 +06.585 -11.463 +07.800 -11.463 +07.220
20251029.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 →

2025/20251029_bto · BTO · 3 frames · 64.3 MB · 11:22:12–11:29:48 UT

11:22:12 UT · 30 ms 11:29:48 UT · 60 ms · over-exposed 11:24:50 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.