Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Thursday, 10 April 2025

‹ 09.04.2025 2025 11.04.2025 ›

Photosphere sunspot drawing and RDS evaluation

10.04.2025 photosphere drawing

High-resolution scan (3230 px)

Time
08:30 UT
Observer
Süleyman FİŞEK
g
10
f
51
R
151
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CRI – 9Group 1 · CRI – 9 Group 2 · DAI – 22Group 2 · DAI – 22 Group 3 · AX_ – 2Group 3 · AX_ – 2 Group 4 · AX_ – 1Group 4 · AX_ – 1 Group 5 · AX_ – 2Group 5 · AX_ – 2 Group 6 · DHO – 3Group 6 · DHO – 3 Group 7 · CSO – 3Group 7 · CSO – 3 Group 8 · DSI – 3Group 8 · DSI – 3 Group 9 · DHO – 4Group 9 · DHO – 4 Group 10 · HS_ – 2Group 10 · HS_ – 2
RDS data file (.gzd) 
[Gözlem]
Tarih=10.04.2025
Saat=08:30
Gözlemci=Süleyman FİŞEK
KontrolEden=Ergün EGE
Durumaçısı=-26.2
Enlemaçısı=-5.96
Boylamaçısı=207.71
Boylamfark=2
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.7
Sırano=20221
AyRasatNo=5
RasatÖnceki=09.04.2025
RasatSonraki=11.04.2025

[Leke Grupları]
Grupsayısı=10:6:4
LekeSayısı=51:39:12
RölatifSayı=151:99:52
01=CRI 09 +16.746 +27.220 234.930 +0.000 0000 0 +17.748 +31.464 +15.745 +22.976 +16.746 +31.264 +16.746 +23.176
02=DAI 22 +06.811 +24.953 232.663 +0.000 0000 0 +08.840 +29.656 +05.539 +20.250 +06.811 +29.456 +06.811 +20.450
03=AX_ 02 +07.394 -24.524 183.186 +0.000 0000 0 +07.880 -23.672 +06.907 -25.377 +07.394 -24.171 +07.394 -24.877
04=AX_ 01 +17.180 -34.348 173.362 -1.000 0000 0 +17.180 -34.348 +17.180 -34.348
05=AX_ 02 +10.660 -50.484 157.226 +0.000 0000 0 +11.269 -49.758 +10.510 -51.210 +10.660 -50.258 +10.660 -50.710
06=DHO 03 +06.186 -72.169 135.541 +0.000 0000 0 +07.862 -75.238 +04.510 -69.100 +06.186 -69.300 +06.186 -75.380
07=CSO 03 -15.470 +75.633 283.343 +0.000 0000 0 -13.212 +80.304 -16.882 +70.961 -15.470 +80.104 -15.470 +71.161
08=DSI 03 -17.710 +60.776 268.486 +0.000 0000 0 -15.541 +62.309 -19.880 +59.243 -17.710 +62.109 -17.710 +59.443
09=DHO 04 -11.912 +46.410 253.751 +0.000 0000 0 -10.296 +50.560 -13.528 +42.260 -11.912 +49.856 -11.912 +42.226
10=HS_ 02 -06.771 -27.787 179.923 +0.000 0000 0 -05.769 -26.592 -07.774 -28.981 -06.771 -27.930 -06.771 -28.482
20250410.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 →

2025/20250410_sf · SF · 6 frames · 128.6 MB · 08:46:00–08:50:39 UT

08:48:19 UT · 30 ms 08:49:54 UT · 30 ms 08:46:00 UT · 30 ms 08:49:05 UT · 60 ms · over-exposed 08:50:39 UT · 60 ms · over-exposed 08:47:34 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.