Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Friday, 24 April 2026

‹ 23.04.2026 2026 27.04.2026 ›

Photosphere sunspot drawing and RDS evaluation

24.04.2026 photosphere drawing

High-resolution scan (3230 px)

Time
10:30 UT
Observer
İrem ÖZDEMİR
g
7
f
28
R
98
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · EHO – 3Group 1 · EHO – 3 Group 2 · AX_ – 1Group 2 · AX_ – 1 Group 3 · EHC – 11Group 3 · EHC – 11 Group 4 · BXO – 2Group 4 · BXO – 2 Group 5 · AX_ – 2Group 5 · AX_ – 2 Group 6 · HS_ – 1Group 6 · HS_ – 1 Group 7 · DAC – 8Group 7 · DAC – 8
RDS data file (.gzd) 
[Gözlem]
Tarih=24.04.2026
Saat=10:30
Gözlemci=İrem ÖZDEMİR
KontrolEden=Yağız ALTIKULAÇ
Durumaçısı=-25.12
Enlemaçısı=-4.83
Boylamaçısı=243.98
Boylamfark=1
GKalite=3
GDurum=
Kuzeyaçısı=-0.5
Sırano=20454
AyRasatNo=15
RasatÖnceki=23.04.2026
RasatSonraki=27.04.2026

[Leke Grupları]
Grupsayısı=7:5:2
LekeSayısı=28:19:9
RölatifSayı=98:69:29
01=EHO 03 +15.490 +72.559 316.539 +0.000 0000 0 +17.160 +79.276 +13.964 +65.842 +15.490 +79.760 +15.490 +66.420
02=AX_ 01 +07.927 +64.725 308.705 -1.000 0000 0 +08.171 +65.173 +07.684 +64.276
03=EHC 11 +16.568 -18.524 225.456 +0.000 0000 0 +18.636 -11.280 +14.499 -26.200 +16.568 -11.264 +16.568 -25.784
04=BXO 02 +16.869 -51.995 191.985 +0.000 0000 0 +18.190 -48.758 +15.548 -55.231 +16.869 -48.958 +16.869 -55.310
05=AX_ 02 +06.359 -80.221 163.759 +0.000 0000 0 +07.440 -78.116 +05.674 -82.325 +06.359 -78.316 +06.359 -82.126
06=HS_ 01 -10.650 -30.993 212.987 -1.000 0000 0 -09.885 -29.688 -11.415 -32.299
07=DAC 08 -04.298 -37.501 206.479 +0.000 0000 0 -02.360 -34.418 -06.236 -40.583 -04.298 -34.618 -04.298 -40.383
20260424.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 →

2026/20260424 · · 6 frames · 128.6 MB · 10:31:04–10:37:16 UT

10:35:57 UT · 30 ms 10:31:04 UT · 30 ms 10:32:50 UT · 40 ms · over-exposed 10:36:36 UT · 40 ms · over-exposed 10:37:16 UT · 50 ms · over-exposed 10:34:01 UT · 50 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.