Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Tuesday, 9 September 2025

‹ 08.09.2025 2025 10.09.2025 ›

Photosphere sunspot drawing and RDS evaluation

09.09.2025 photosphere drawing

High-resolution scan (3230 px)

Time
07:40 UT
Observer
Süleyman FİŞEK
g
7
f
29
R
99
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HS_ – 1Group 1 · HS_ – 1 Group 2 · BXO – 2Group 2 · BXO – 2 Group 3 · CSI – 8Group 3 · CSI – 8 Group 4 · CSI – 6Group 4 · CSI – 6 Group 5 · AX_ – 1Group 5 · AX_ – 1 Group 6 · HS_ – 1Group 6 · HS_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=9.09.2025
Saat=07:40
Gözlemci=Süleyman FİŞEK
KontrolEden=Olcay PLEVNE
Durumaçısı=22.99
Enlemaçısı=7.25
Boylamaçısı=358.13
Boylamfark=2
GKalite=3
GDurum=G.T , K.T
Kuzeyaçısı=-0.7
Sırano=20341
AyRasatNo=7
RasatÖnceki=08.09.2025
RasatSonraki=10.09.2025

[Leke Grupları]
Grupsayısı=7:5:2
LekeSayısı=29:18:11
RölatifSayı=99:68:31
01=HS_ 01 +08.794 +69.120 067.250 -1.000 0000 0 +09.513 +70.413 +08.750 +67.827
02=BXO 02 +09.894 +51.745 049.875 +0.000 0000 0 +10.200 +53.382 +09.587 +50.107 +09.894 +52.882 +09.894 +50.607
03=CSI 08 +29.229 +49.607 047.737 +0.000 0000 0 +32.140 +55.376 +26.443 +43.839 +29.229 +55.176 +29.229 +44.390
04=CSI 06 +06.581 +30.191 028.321 +0.000 0000 0 +07.911 +32.898 +05.252 +27.484 +06.581 +32.698 +06.581 +27.684
05=AX_ 01 +16.410 -04.429 353.701 -1.000 0000 0 +16.410 -04.429 +16.410 -04.429
06=HS_ 01 -13.547 +13.330 011.460 -1.000 0000 0 -12.531 +14.764 -14.563 +11.896
07=DAC 10 -13.675 +02.667 000.797 +0.000 0000 0 -11.575 +07.438 -15.776 -02.105 -13.675 +07.238 -13.675 -01.905
20250909.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 →

2025/20250909_sf · SF · 6 frames · 128.5 MB · 07:53:14–07:55:45 UT

07:53:14 UT · 30 ms 07:55:15 UT · 30 ms 07:54:15 UT · 30 ms 07:55:45 UT · 60 ms · over-exposed 07:53:44 UT · 60 ms · over-exposed 07:54:45 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.