Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Friday, 24 July 2026

‹ 23.07.2026 2026 26.07.2026 ›

Photosphere sunspot drawing and RDS evaluation

24.07.2026 photosphere drawing

High-resolution scan (3229 px)

Time
10:15 UT
Observer
Melike ERYILMAZ
g
6
f
31
R
91
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · EHC – 14Group 1 · EHC – 14 Group 2 · CKO – 6Group 2 · CKO – 6 Group 3 · AX_ – 2Group 3 · AX_ – 2 Group 4 · HS_ – 4Group 4 · HS_ – 4 Group 5 · HS_ – 2Group 5 · HS_ – 2 Group 6 · HA_ – 3Group 6 · HA_ – 3
RDS data file (.gzd) 
[Gözlem]
Tarih=24.07.2026
Saat=10:15
Gözlemci=Melike ERYILMAZ
KontrolEden=Tuğba BOZTEPE
Durumaçısı=7.68
Enlemaçısı=5.16
Boylamaçısı=120.38
Boylamfark=1
GKalite=3
GDurum=G.T , K.T
Kuzeyaçısı=-0.7
Sırano=20521
AyRasatNo=21
RasatÖnceki=23.07.2026
RasatSonraki=26.07.2026

[Leke Grupları]
Grupsayısı=6:4:2
LekeSayısı=31:26:5
RölatifSayı=91:66:25
01=EHC 14 +04.970 +36.563 156.943 +0.000 0000 0 +07.270 +43.600 +02.912 +29.526 +04.970 +43.400 +04.970 +29.726
02=CKO 06 +17.310 -15.130 105.250 +0.000 0000 0 +19.423 -12.276 +15.196 -17.984 +17.310 -12.476 +17.310 -17.784
03=AX_ 02 +00.295 -22.395 097.985 +0.000 0000 0 +00.607 -21.882 -00.160 -22.908 +00.295 -22.382 +00.295 -22.408
04=HS_ 04 +08.365 -67.128 053.252 +0.000 0000 0 +09.996 -63.690 +06.734 -70.566 +08.365 -64.190 +08.365 -70.660
05=HS_ 02 -08.470 +71.320 191.700 +0.000 0000 0 -07.175 +73.289 -08.918 +69.351 -08.470 +72.789 -08.470 +69.851
06=HA_ 03 -00.790 -33.666 086.714 +0.000 0000 0 +00.539 -32.280 -02.118 -35.303 -00.790 -32.654 -00.790 -34.678
20260724.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 →

2026/20260724_me · ME · 6 frames · 128.6 MB · 10:25:36–10:28:37 UT

10:26:37 UT · 30 ms 10:28:07 UT · 60 ms 10:28:37 UT · 30 ms 10:25:36 UT · 60 ms · over-exposed 10:27:07 UT · 60 ms 10:27:37 UT · 30 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.