Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Monday, 20 July 2026

‹ 19.07.2026 2026 21.07.2026 ›

Photosphere sunspot drawing and RDS evaluation

20.07.2026 photosphere drawing

High-resolution scan (3230 px)

Time
08:35 UT
Observer
Melike ERYILMAZ
g
4
f
22
R
62
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · DAI – 9Group 1 · DAI – 9 Group 2 · DAO – 3Group 2 · DAO – 3 Group 3 · CHO – 6Group 3 · CHO – 6 Group 4 · AX_ – 4Group 4 · AX_ – 4
RDS data file (.gzd) 
[Gözlem]
Tarih=20.07.2026
Saat=08:35
Gözlemci=Melike ERYILMAZ
KontrolEden=Melike ERYILMAZ
Durumaçısı=5.94
Enlemaçısı=4.8
Boylamaçısı=174.22
Boylamfark=2
GKalite=3
GDurum=G.T , K.T
Kuzeyaçısı=-1.0
Sırano=20517
AyRasatNo=17
RasatÖnceki=19.07.2026
RasatSonraki=21.07.2026

[Leke Grupları]
Grupsayısı=4:2:2
LekeSayısı=22:12:10
RölatifSayı=62:32:30
01=DAI 09 +06.650 -17.747 156.473 +0.000 0000 0 +08.270 -14.514 +03.861 -20.980 +06.650 -14.714 +06.650 -20.780
02=DAO 03 +15.572 -66.101 108.119 +0.000 0000 0 +17.581 -63.180 +13.562 -69.184 +15.572 -63.218 +15.572 -68.984
03=CHO 06 -06.222 +17.233 191.453 +0.000 0000 0 -04.373 +19.308 -08.710 +15.159 -06.222 +19.108 -06.222 +15.359
04=AX_ 04 -10.971 -17.317 156.903 +0.000 0000 0 -09.411 -15.905 -12.531 -18.730 +00.000 +00.000 +00.000 +00.000
20260720.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 →

2026/20260720_me · ME · 6 frames · 128.6 MB · 08:44:03–08:46:33 UT

08:45:03 UT · 60 ms · over-exposed 08:46:03 UT · 60 ms · over-exposed 08:44:03 UT · 60 ms · over-exposed 08:46:33 UT · 30 ms 08:45:33 UT · 30 ms 08:44:33 UT · 30 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.