Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Sunday, 25 May 2025

‹ 24.05.2025 2025 27.05.2025 ›

Photosphere sunspot drawing and RDS evaluation

25.05.2025 photosphere drawing

High-resolution scan (3230 px)

Time
08:10 UT
Observer
Ergün EGE
g
7
f
17
R
87
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HS_ – 1Group 1 · HS_ – 1 Group 2 · HR_ – 1Group 2 · HR_ – 1 Group 3 · DAC – 7Group 3 · DAC – 7 Group 4 · HS_ – 1Group 4 · HS_ – 1 Group 5 · HR_ – 1Group 5 · HR_ – 1 Group 6 · BXO – 3Group 6 · BXO – 3 Group 7 · CAO – 3Group 7 · CAO – 3
RDS data file (.gzd) 
[Gözlem]
Tarih=25.05.2025
Saat=08:10
Gözlemci=Ergün EGE
KontrolEden=Ergün EGE
Durumaçısı=-17.72
Enlemaçısı=-1.47
Boylamaçısı=333.14
Boylamfark=2
GKalite=3
GDurum=Y.B
Kuzeyaçısı=-0.3
Sırano=20254
AyRasatNo=20
RasatÖnceki=24.05.2025
RasatSonraki=27.05.2025

[Leke Grupları]
Grupsayısı=7:1:6
LekeSayısı=17:1:16
RölatifSayı=87:11:76
01=HS_ 01 +06.173 -26.831 306.309 +0.000 0000 0 +06.645 -26.273 +05.702 -27.389 +06.173 -26.773 +06.173 -26.889
02=HR_ 01 -12.329 +45.448 018.588 +0.000 0000 0 -12.800 +45.905 -12.579 +44.992 -12.329 +45.405 -12.329 +45.492
03=DAC 07 -04.291 +44.855 017.995 +0.000 0000 0 -03.730 +49.434 -05.510 +40.275 -04.291 +49.234 -04.291 +40.475
04=HS_ 01 -12.891 +03.913 337.530 +0.000 0000 0 -11.959 +04.850 -13.823 +02.976 -12.891 +04.350 -12.891 +03.476
05=HR_ 01 -06.502 -05.558 327.582 +0.000 0000 0 -05.988 -05.288 -07.160 -05.827 -06.502 -05.789 -06.502 -05.327
06=BXO 03 -13.605 -28.173 304.967 +0.000 0000 0 -13.160 -26.397 -14.194 -29.949 -13.605 -26.897 -13.605 -29.449
07=CAO 03 -13.337 -76.419 256.721 +0.000 0000 0 -12.501 -72.350 -14.174 -80.487 -13.337 -72.550 -13.337 -80.287
20250525.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 →

2025/20250525_ee · EE · 1 frames · 21.4 MB · 08:12:38 UT

08:12:38 UT · 20 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.