Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Monday, 6 April 2026

‹ 05.04.2026 2026 07.04.2026 ›

Photosphere sunspot drawing and RDS evaluation

06.04.2026 photosphere drawing

High-resolution scan (3230 px)

Time
10:50 UT
Observer
Süleyman FİŞEK
g
8
f
42
R
122
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HS_ – 1Group 1 · HS_ – 1 Group 2 · HR_ – 1Group 2 · HR_ – 1 Group 3 · ESC – 21Group 3 · ESC – 21 Group 4 · HS_ – 1Group 4 · HS_ – 1 Group 5 · BXI – 11Group 5 · BXI – 11 Group 6 · CSO – 2Group 6 · CSO – 2 Group 7 · AX_ – 3Group 7 · AX_ – 3 Group 8 · BXO – 2Group 8 · BXO – 2
RDS data file (.gzd) 
[Gözlem]
Tarih=6.04.2026
Saat=10:50
Gözlemci=Süleyman FİŞEK
KontrolEden=Burçin TANIK
Durumaçısı=-26.25
Enlemaçısı=-6.24
Boylamaçısı=121.66
Boylamfark=1
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.8
Sırano=20443
AyRasatNo=4
RasatÖnceki=05.04.2026
RasatSonraki=07.04.2026

[Leke Grupları]
Grupsayısı=8:5:3
LekeSayısı=42:35:7
RölatifSayı=122:85:37
01=HS_ 01 +13.479 +63.240 184.900 +0.000 0000 0 +14.276 +64.258 +12.682 +62.221 +13.479 +63.759 +13.479 +62.722
02=HR_ 01 +07.630 +57.945 179.605 +0.000 0000 0 +07.530 +58.647 +06.597 +57.242 +07.630 +58.147 +07.630 +57.743
03=ESC 21 +02.790 +34.153 155.813 +0.000 0000 0 +04.245 +40.790 -00.870 +28.226 +02.790 +39.879 +02.790 +28.426
04=HS_ 01 +08.431 +32.207 153.867 +0.000 0000 0 +09.254 +32.912 +07.608 +31.501 +08.431 +32.413 +08.431 +32.100
05=BXI 11 +08.767 -04.370 117.290 +0.000 0000 0 +10.946 -02.202 +06.587 -06.539 +08.767 -02.402 +08.767 -06.339
06=CSO 02 -27.820 +48.925 170.585 +0.000 0000 0 -23.849 +42.650 -31.791 +55.785 -27.820 +55.585 -27.820 +42.265
07=AX_ 03 -06.809 -01.643 120.170 +0.000 0000 0 -06.229 -00.724 -07.389 -02.563 -06.809 -01.224 -06.809 -02.620
08=BXO 02 -06.862 -13.901 107.759 +0.000 0000 0 -05.160 -12.368 -08.563 -15.434 -06.862 -12.568 -06.862 -15.234
20260406.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 →

2026/20260406_sf · SF · 6 frames · 128.6 MB · 10:57:20–11:00:20 UT

10:57:20 UT · 30 ms 10:59:50 UT · 30 ms 10:58:49 UT · 30 ms 10:58:19 UT · 60 ms · over-exposed 11:00:20 UT · 60 ms · over-exposed 10:59:19 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.