Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Thursday, 17 July 2025

‹ 16.07.2025 2025 18.07.2025 ›

Photosphere sunspot drawing and RDS evaluation

17.07.2025 photosphere drawing

High-resolution scan (3230 px)

Time
07:00 UT
Observer
Süleyman FİŞEK
g
10
f
115
R
215
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · EKI – 18Group 1 · EKI – 18 Group 2 · CKO – 15Group 2 · CKO – 15 Group 3 · EKC – 26Group 3 · EKC – 26 Group 4 · EKC – 25Group 4 · EKC – 25 Group 5 · AX_ – 1Group 5 · AX_ – 1 Group 6 · AX_ – 2Group 6 · AX_ – 2 Group 7 · CSI – 4Group 7 · CSI – 4 Group 8 · BXI – 14Group 8 · BXI – 14 Group 9 · AX_ – 9Group 9 · AX_ – 9 Group 10 · HS_ – 1Group 10 · HS_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=17.07.2025
Saat=07:00
Gözlemci=Süleyman FİŞEK
KontrolEden=Olcay PLEVNE
Durumaçısı=4.71
Enlemaçısı=4.54
Boylamaçısı=352.33
Boylamfark=3
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.6
Sırano=20301
AyRasatNo=15
RasatÖnceki=16.07.2025
RasatSonraki=18.07.2025

[Leke Grupları]
Grupsayısı=10:5:5
LekeSayısı=115:85:30
RölatifSayı=215:135:80
01=EKI 18 +21.786 +42.787 035.117 17.725 0000 0 +24.560 +47.992 +19.516 +37.583 +22.749 +45.931 +20.868 +40.330
02=CKO 15 +21.232 +28.786 021.116 +0.000 0000 0 +23.366 +35.304 +19.980 +22.268 +21.232 +35.104 +21.232 +22.468
03=EKC 26 +24.264 +14.240 006.354 +0.000 0000 0 +26.352 +19.112 +22.176 +08.937 +24.264 +18.912 +24.264 +09.137
04=EKC 25 +01.433 -18.160 334.170 +0.000 0000 0 +03.421 -12.904 -00.554 -23.416 +01.433 -13.104 +01.433 -23.216
05=AX_ 01 +06.214 -50.736 301.594 -1.000 0000 0 +06.214 -50.736 +06.214 -50.736
06=AX_ 02 -07.146 +54.344 046.674 +0.000 0000 0 -06.640 +55.671 -08.228 +53.170 +00.000 +00.000 +00.000 +00.000
07=CSI 04 -06.825 +04.498 356.828 +0.000 0000 0 -05.903 +06.352 -07.748 +02.645 -06.825 +06.152 -06.825 +02.845
08=BXI 14 -23.819 -04.429 347.901 +0.000 0000 0 -22.191 -00.553 -25.446 -08.304 -23.819 -00.753 -23.819 -08.104
09=AX_ 09 -15.775 -04.975 347.355 +0.000 0000 0 -14.885 -04.313 -16.664 -05.636 -15.775 -04.813 -15.775 -05.136
10=HS_ 01 -14.399 -44.735 307.595 -1.000 0000 0 -13.745 -44.252 -15.520 -45.218
20250717.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 →

2025/20250717_sf · SF · 6 frames · 128.6 MB · 07:13:29–07:18:44 UT

07:18:14 UT · 3 ms 07:17:14 UT · 3 ms 07:18:44 UT · 6 ms 07:14:28 UT · 6 ms 07:13:29 UT · 3 ms 07:17:44 UT · 6 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.