Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 22 July 2026

‹ 21.07.2026 2026 23.07.2026 ›

Photosphere sunspot drawing and RDS evaluation

22.07.2026 photosphere drawing

High-resolution scan (3224 px)

Time
09:00 UT
Observer
Burçin TANIK
g
4
f
28
R
68
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · EKC – 18Group 1 · EKC – 18 Group 2 · DKO – 5Group 2 · DKO – 5 Group 3 · HS_ – 2Group 3 · HS_ – 2 Group 4 · CSO – 3Group 4 · CSO – 3
RDS data file (.gzd) 
[Gözlem]
Tarih=22.07.2026
Saat=09:00
Gözlemci=Burçin TANIK
KontrolEden=Melike ERYILMAZ
Durumaçısı=6.81
Enlemaçısı=4.98
Boylamaçısı=147.53
Boylamfark=2
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.3
Sırano=20519
AyRasatNo=19
RasatÖnceki=21.07.2026
RasatSonraki=23.07.2026

[Leke Grupları]
Grupsayısı=4:2:2
LekeSayısı=28:23:5
RölatifSayı=68:43:25
01=EKC 18 +05.425 +08.850 156.380 07.183 0000 0 +07.254 +14.862 +03.596 +02.838 +06.190 +13.519 +04.905 +04.645
02=DKO 05 +15.601 -42.879 104.651 23.531 0000 0 +17.475 -40.102 +13.728 -45.656 +15.927 -41.624 +14.476 -44.957
03=HS_ 02 -05.920 +43.202 190.732 -1.000 0000 0 -04.805 +44.820 -07.340 +42.321
04=CSO 03 -03.969 -63.878 083.652 23.508 0000 0 -02.811 -61.855 -05.128 -65.901 -03.548 -62.853 -04.439 -64.903
20260722.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 →

2026/20260722_bto · BTO · 4 frames · 85.7 MB · 09:15:08–09:22:45 UT

09:22:45 UT · 10 ms 09:19:52 UT · 20 ms 09:15:08 UT · 30 ms 09:17:56 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.