Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 5 February 2025

‹ 04.02.2025 2025 13.02.2025 ›

Photosphere sunspot drawing and RDS evaluation

05.02.2025 photosphere drawing

High-resolution scan (3234 px)

Time
08:00 UT
Observer
Burçin TANIK
g
9
f
54
R
144
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CRI – 7Group 1 · CRI – 7 Group 2 · CSO – 3Group 2 · CSO – 3 Group 3 · CRI – 6Group 3 · CRI – 6 Group 4 · HA_ – 5Group 4 · HA_ – 5 Group 5 · AX_ – 1Group 5 · AX_ – 1 Group 6 · EKC – 29Group 6 · EKC – 29 Group 7 · AX_ – 1Group 7 · AX_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=5.02.2025
Saat=08:00
Gözlemci=Burçin TANIK
KontrolEden=Korhan YELKENCİ
Durumaçısı=-13.96
Enlemaçısı=-6.32
Boylamaçısı=331.45
Boylamfark=2
GKalite=3
GDurum=G.T , B.A
Kuzeyaçısı=-1.0
Sırano=20188
AyRasatNo=3
RasatÖnceki=04.02.2025
RasatSonraki=13.02.2025

[Leke Grupları]
Grupsayısı=9:9:0
LekeSayısı=54:54:0
RölatifSayı=144:144:0
01=CRI 07 +19.487 +28.613 000.630 32.356 0000 0 +21.944 +31.823 +17.300 +25.403 +17.867 +30.508 +19.868 +27.348
02=CSO 03 +12.159 +27.406 358.856 31.703 0000 0 +13.880 +30.335 +10.438 +24.477 +11.149 +28.636 +12.908 +25.786
03=CRI 06 +14.201 +19.102 350.552 +0.000 0000 0 +16.284 +21.960 +12.119 +17.109 +14.201 +20.896 +14.201 +17.309
04=HA_ 05 +10.853 +15.525 346.975 -1.000 0000 0 +11.732 +17.600 +09.973 +13.990
05=AX_ 01 +16.289 +11.746 343.196 -1.000 0000 0 +16.289 +11.746 +16.289 +11.746
06=EKC 29 +08.145 +04.932 336.382 19.393 0000 0 +12.450 +12.136 +04.244 -02.272 +09.450 +09.603 +06.343 +00.730
07=AX_ 01 +20.249 -20.959 310.491 -1.000 0000 0 +20.249 -20.959 +20.249 -20.959
08=AX_ 01 +03.765 -58.410 273.400 -1.000 0000 0 +03.765 -58.410 +03.765 -58.410
09=AX_ 01 +03.568 -84.118 247.332 -1.000 0000 0 +03.568 -84.118 +03.568 -84.118
20250205.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 →

2025/20250205_bto · BTO · 3 frames · 64.3 MB · 08:20:17–08:23:45 UT

08:22:24 UT · 20 ms 08:20:17 UT · 30 ms 08:23:45 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.