Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 26 February 2025

‹ 24.02.2025 2025 27.02.2025 ›

Photosphere sunspot drawing and RDS evaluation

26.02.2025 photosphere drawing

High-resolution scan (3236 px)

Time
08:40 UT
Observer
Burçin TANIK
g
7
f
46
R
116
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HK_ – 3Group 1 · HK_ – 3 Group 2 · AX_ – 1Group 2 · AX_ – 1 Group 3 · CKI – 14Group 3 · CKI – 14 Group 4 · HS_ – 1Group 4 · HS_ – 1 Group 5 · HS_ – 1Group 5 · HS_ – 1 Group 6 · EKC – 23Group 6 · EKC – 23 Group 7 · ?__ – 3Group 7 · ?__ – 3
RDS data file (.gzd) 
[Gözlem]
Tarih=26.02.2025
Saat=08:40
Gözlemci=Burçin TANIK
KontrolEden=Süleyman FİŞEK
Durumaçısı=-20.87
Enlemaçısı=-7.18
Boylamaçısı=54.54
Boylamfark=2
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.1
Sırano=20195
AyRasatNo=10
RasatÖnceki=24.02.2025
RasatSonraki=27.02.2025

[Leke Grupları]
Grupsayısı=7:4:3
LekeSayısı=46:19:27
RölatifSayı=116:59:57
01=HK_ 03 +15.930 +54.631 109.171 +0.000 0000 0 +16.400 +56.320 +14.147 +53.230 +15.930 +55.676 +15.930 +53.586
02=AX_ 01 +21.774 +48.608 103.148 -1.000 0000 0 +21.774 +48.608 +21.774 +48.608
03=CKI 14 +18.471 -30.870 024.453 21.743 0000 0 +21.161 -25.172 +15.781 -35.200 +17.289 -27.139 +19.802 -33.456
04=HS_ 01 +04.869 -61.871 352.669 +0.000 0000 0 +05.359 -60.968 +04.380 -62.774 +04.869 -61.468 +04.869 -62.274
05=HS_ 01 -14.225 +82.661 137.201 +0.000 0000 0 -13.554 +83.748 -14.897 +81.574 -14.225 +83.248 -14.225 +82.740
06=EKC 23 -12.711 +57.740 112.280 +0.000 0000 0 -10.411 +63.213 -15.100 +52.267 -12.711 +63.130 -12.711 +52.467
07=?__ 03 -12.185 -28.474 026.660 +0.000 0000 0 -10.336 -27.520 -14.330 -29.896 -12.185 -27.786 -12.185 -29.162
20250226.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 →

2025/20250226_bto · BTO · 4 frames · 85.7 MB · 08:49:39–08:53:41 UT

08:51:28 UT · 20 ms 08:53:41 UT · 30 ms 08:52:17 UT · 70 ms · over-exposed 08:49:39 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.