Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Thursday, 22 May 2025

‹ 21.05.2025 2025 23.05.2025 ›

Photosphere sunspot drawing and RDS evaluation

22.05.2025 photosphere drawing

High-resolution scan (3230 px)

Time
08:20 UT
Observer
Süleyman FİŞEK
g
8
f
17
R
97
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HH_ – 1Group 1 · HH_ – 1 Group 2 · AX_ – 3Group 2 · AX_ – 3 Group 3 · HS_ – 1Group 3 · HS_ – 1 Group 4 · CAI – 5Group 4 · CAI – 5 Group 5 · HS_ – 1Group 5 · HS_ – 1 Group 6 · HS_ – 2Group 6 · HS_ – 2 Group 7 · HS_ – 1Group 7 · HS_ – 1 Group 8 · BXO – 3Group 8 · BXO – 3
RDS data file (.gzd) 
[Gözlem]
Tarih=22.05.2025
Saat=08:20
Gözlemci=Süleyman FİŞEK
KontrolEden=Ergün EGE
Durumaçısı=-18.71
Enlemaçısı=-1.82
Boylamaçısı=12.74
Boylamfark=2
GKalite=3
GDurum=G.T
Kuzeyaçısı=0.0
Sırano=20251
AyRasatNo=17
RasatÖnceki=21.05.2025
RasatSonraki=23.05.2025

[Leke Grupları]
Grupsayısı=8:3:5
LekeSayısı=17:5:12
RölatifSayı=97:35:62
01=HH_ 01 +13.761 +46.282 059.220 +0.000 0000 0 +15.244 +47.693 +12.279 +44.872 +13.761 +47.193 +13.761 +45.372
02=AX_ 03 +19.734 -45.973 326.767 +0.000 0000 0 +20.681 -44.941 +18.787 -47.500 +00.000 +00.000 +00.000 +00.000
03=HS_ 01 +05.998 -68.214 304.526 +0.000 0000 0 +06.710 -67.166 +05.287 -69.262 +05.998 -67.666 +05.998 -68.762
04=CAI 05 -05.847 +60.218 072.958 +0.000 0000 0 -04.813 +63.596 -06.882 +56.840 -05.847 +63.396 -05.847 +57.400
05=HS_ 01 -12.350 +06.730 018.813 +0.000 0000 0 -11.339 +06.734 -12.731 +05.412 -12.350 +06.891 -12.350 +06.569
06=HS_ 02 -13.460 -35.697 337.430 +0.000 0000 0 -11.965 -34.582 -14.126 -36.811 -13.460 -35.820 -13.460 -36.312
07=HS_ 01 -06.200 -45.329 327.411 +0.000 0000 0 -05.408 -44.558 -06.632 -46.990 -06.200 -44.613 -06.200 -46.450
08=BXO 03 -12.534 -64.844 307.896 +0.000 0000 0 -12.600 -62.652 -13.610 -67.360 -12.534 -62.990 -12.534 -66.698
20250522.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 →

2025/20250522_sf · SF · 6 frames · 128.6 MB · 08:37:14–08:40:14 UT

08:37:14 UT · 30 ms 08:39:44 UT · 30 ms 08:38:44 UT · 30 ms 08:40:14 UT · 60 ms 08:39:14 UT · 60 ms · over-exposed 08:38:14 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.