Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 25 June 2025

‹ 24.06.2025 2025 26.06.2025 ›

Photosphere sunspot drawing and RDS evaluation

25.06.2025 photosphere drawing

High-resolution scan (2934 px)

Time
08:15 UT
Observer
Burçin TANIK
g
6
f
35
R
95
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CAI – 9Group 1 · CAI – 9 Group 2 · BXO – 4Group 2 · BXO – 4 Group 3 · HS_ – 1Group 3 · HS_ – 1 Group 4 · CKI – 8Group 4 · CKI – 8 Group 5 · ?__ – 9Group 5 · ?__ – 9 Group 6 · DAO – 4Group 6 · DAO – 4
RDS data file (.gzd) 
[Gözlem]
Tarih=25.06.2025
Saat=08:15
Gözlemci=Burçin TANIK
KontrolEden=Süleyman FİŞEK
Durumaçısı=-5.15
Enlemaçısı=2.23
Boylamaçısı=282.81
Boylamfark=2
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.4
Sırano=20281
AyRasatNo=24
RasatÖnceki=24.06.2025
RasatSonraki=26.06.2025

[Leke Grupları]
Grupsayısı=6:2:4
LekeSayısı=35:13:22
RölatifSayı=95:33:62
01=CAI 09 +06.108 +12.252 295.620 +0.000 0000 0 +07.423 +15.860 +04.794 +09.417 +06.108 +14.886 +06.108 +09.617
02=BXO 04 +12.692 -65.220 217.590 +0.000 0000 0 +13.560 -63.612 +11.824 -66.828 +12.692 -63.812 +12.692 -66.628
03=HS_ 01 -11.889 +24.140 306.950 +0.000 0000 0 -11.240 +24.909 -12.755 +23.370 -11.889 +24.410 -11.889 +23.870
04=CKI 08 -14.847 +18.903 301.713 +0.000 0000 0 -13.525 +22.156 -16.169 +15.650 -14.847 +21.956 -14.847 +15.850
05=?__ 09 -11.576 +06.790 289.600 +0.000 0000 0 -09.687 +08.761 -13.466 +04.820 -11.576 +08.260 -11.576 +05.319
06=DAO 04 -11.814 -08.606 274.204 +0.000 0000 0 -11.111 -05.970 -12.517 -11.241 -11.814 -06.470 -11.814 -10.741
20250625.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 →

2025/20250625_bto · BTO · 4 frames · 85.7 MB · 08:21:19–08:29:56 UT

08:26:03 UT · 40 ms 08:21:19 UT · 30 ms 08:23:57 UT · 70 ms · over-exposed 08:29:56 UT · 80 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.