Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Tuesday, 6 May 2025

‹ 05.05.2025 2025 07.05.2025 ›

Photosphere sunspot drawing and RDS evaluation

06.05.2025 photosphere drawing

High-resolution scan (3229 px)

Time
07:25 UT
Observer
Süleyman FİŞEK
g
4
f
44
R
84
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HH_ – 1Group 1 · HH_ – 1 Group 2 · FKC – 27Group 2 · FKC – 27 Group 3 · DAC – 7Group 3 · DAC – 7 Group 4 · ESC – 9Group 4 · ESC – 9
RDS data file (.gzd) 
[Gözlem]
Tarih=6.05.2025
Saat=07:25
Gözlemci=Süleyman FİŞEK
KontrolEden=Burçin TANIK
Durumaçısı=-23.03
Enlemaçısı=-3.63
Boylamaçısı=224.85
Boylamfark=3
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.6
Sırano=20238
AyRasatNo=4
RasatÖnceki=05.05.2025
RasatSonraki=07.05.2025

[Leke Grupları]
Grupsayısı=4:3:1
LekeSayısı=44:35:9
RölatifSayı=84:65:19
01=HH_ 01 +05.656 +79.369 304.219 +0.000 0000 0 +06.495 +81.800 +04.818 +77.730 +05.656 +80.904 +05.656 +77.834
02=FKC 27 +07.666 +17.141 241.991 +0.000 0000 0 +11.773 +26.204 +03.559 +08.780 +07.666 +26.400 +07.666 +08.278
03=DAC 07 +06.759 -13.200 211.830 +0.000 0000 0 +07.881 -09.560 +05.637 -16.481 +06.759 -09.760 +06.759 -16.281
04=ESC 09 -10.729 -44.200 180.830 +0.000 0000 0 -09.630 -38.894 -12.395 -49.145 -10.729 -39.940 -10.729 -48.945
20250506.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 →

2025/20250506_sf · SF · 6 frames · 128.5 MB · 07:29:42–07:32:12 UT

07:31:42 UT · 30 ms 07:30:42 UT · 30 ms 07:29:42 UT · 30 ms 07:30:12 UT · 60 ms · over-exposed 07:32:12 UT · 60 ms · over-exposed 07:31:12 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.