Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 23 April 2025

‹ 22.04.2025 2025 25.04.2025 ›

Photosphere sunspot drawing and RDS evaluation

23.04.2025 photosphere drawing

High-resolution scan (3227 px)

Time
10:30 UT
Observer
Burçin TANIK
g
8
f
51
R
131
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · ESC – 14Group 1 · ESC – 14 Group 2 · ?__ – 9Group 2 · ?__ – 9 Group 3 · HS_ – 1Group 3 · HS_ – 1 Group 4 · DAI – 9Group 4 · DAI – 9 Group 5 · DKC – 12Group 5 · DKC – 12 Group 6 · ?__ – 3Group 6 · ?__ – 3 Group 7 · AX_ – 1Group 7 · AX_ – 1 Group 8 · HA_ – 2Group 8 · HA_ – 2
RDS data file (.gzd) 
[Gözlem]
Tarih=23.04.2025
Saat=10:30
Gözlemci=Burçin TANIK
KontrolEden=Ergün EGE
Durumaçısı=-25.22
Enlemaçısı=-4.9
Boylamaçısı=34.95
Boylamfark=1
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.6
Sırano=20230
AyRasatNo=14
RasatÖnceki=22.04.2025
RasatSonraki=25.04.2025

[Leke Grupları]
Grupsayısı=8:1:7
LekeSayısı=51:14:37
RölatifSayı=131:24:107
01=ESC 14 +11.280 +08.844 043.794 +0.000 0000 0 +12.868 +14.185 +09.188 +03.503 +11.280 +13.985 +11.280 +03.703
02=?__ 09 -02.624 +34.224 069.174 +0.000 0000 0 -01.780 +35.899 -04.169 +32.549 -02.624 +35.399 -02.624 +33.490
03=HS_ 01 -30.716 +05.700 039.957 +0.000 0000 0 -30.215 +05.746 -31.217 +04.267 -30.716 +05.939 -30.716 +05.460
04=DAI 09 -07.973 -04.799 030.151 +0.000 0000 0 -07.370 -01.495 -08.910 -08.104 -07.973 -01.695 -07.973 -07.904
05=DKC 12 -12.734 -33.670 001.280 +0.000 0000 0 -11.462 -29.642 -14.500 -37.698 -12.734 -29.842 -12.734 -37.498
06=?__ 03 -25.689 -42.899 352.510 +0.000 0000 0 -23.890 -41.510 -27.488 -44.289 -25.689 -42.900 -25.689 -43.788
07=AX_ 01 -01.297 -45.423 349.527 -1.000 0000 0 -01.297 -45.423 -01.297 -45.423
08=HA_ 02 -17.397 -69.698 325.252 +0.000 0000 0 -16.752 -68.968 -18.420 -70.428 -17.397 -69.468 -17.397 -69.928
20250423.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 →

2025/20250423_bto · BTO · 2 frames · 42.9 MB · 10:37:31–10:38:38 UT

10:38:38 UT · 20 ms 10:37:31 UT · 50 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.