Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Saturday, 9 August 2025

‹ 08.08.2025 2025 10.08.2025 ›

Photosphere sunspot drawing and RDS evaluation

09.08.2025 photosphere drawing

High-resolution scan (3230 px)

Time
10:50 UT
Observer
Ergün EGE
g
10
f
47
R
147
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · DKC – 7Group 1 · DKC – 7 Group 2 · DSO – 3Group 2 · DSO – 3 Group 3 · BXI – 9Group 3 · BXI – 9 Group 4 · HS_ – 2Group 4 · HS_ – 2 Group 5 · ESC – 17Group 5 · ESC – 17 Group 6 · HS_ – 1Group 6 · HS_ – 1 Group 7 · AX_ – 2Group 7 · AX_ – 2 Group 8 · HS_ – 1Group 8 · HS_ – 1 Group 9 · HS_ – 1Group 9 · HS_ – 1 Group 10 · DRO – 4Group 10 · DRO – 4
RDS data file (.gzd) 
[Gözlem]
Tarih=9.08.2025
Saat=10:50
Gözlemci=Ergün EGE
KontrolEden=Burçin TANIK
Durumaçısı=14.1
Enlemaçısı=6.34
Boylamaçısı=45.72
Boylamfark=0
GKalite=3
GDurum=B.A , Y.B
Kuzeyaçısı=-0.4
Sırano=20318
AyRasatNo=6
RasatÖnceki=08.08.2025
RasatSonraki=10.08.2025

[Leke Grupları]
Grupsayısı=10:9:1
LekeSayısı=47:43:4
RölatifSayı=147:133:14
01=DKC 07 +05.476 +55.489 101.209 +0.000 0000 0 +07.100 +61.380 +03.952 +49.940 +05.476 +60.838 +05.476 +50.140
02=DSO 03 +11.981 +53.368 099.880 +0.000 0000 0 +13.280 +55.583 +10.683 +51.152 +11.981 +55.383 +11.981 +51.352
03=BXI 09 +09.753 +09.866 055.586 +0.000 0000 0 +11.169 +12.805 +08.336 +06.927 +09.753 +12.605 +09.753 +07.127
04=HS_ 02 +21.995 -14.618 031.102 +0.000 0000 0 +23.320 -13.398 +20.958 -15.838 +21.995 -13.898 +21.995 -15.338
05=ESC 17 +08.453 -19.342 026.378 +0.000 0000 0 +10.646 -12.134 +06.260 -26.550 +08.453 -12.334 +08.453 -26.350
06=HS_ 01 +18.714 -34.337 011.383 +0.000 0000 0 +19.533 -33.378 +17.896 -35.295 +18.714 -33.879 +18.714 -34.796
07=AX_ 02 +25.126 -36.771 008.949 +0.000 0000 0 +25.341 -36.510 +24.911 -37.491 +25.126 -36.780 +25.126 -36.762
08=HS_ 01 +11.725 -56.510 349.669 +0.000 0000 0 +12.506 -55.216 +10.945 -56.886 +11.725 -56.175 +11.725 -56.845
09=HS_ 01 +04.746 -57.354 348.366 +0.000 0000 0 +05.535 -56.363 +03.956 -58.345 +04.746 -56.863 +04.746 -57.845
10=DRO 04 -17.150 +61.227 106.947 +0.000 0000 0 -15.971 +64.841 -18.329 +57.613 -17.150 +64.641 -17.150 +57.813
20250809.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 →

2025/20250809 · · 6 frames · 128.6 MB · 10:57:14–11:16:01 UT

10:59:23 UT · 50 ms 11:15:22 UT · 40 ms 10:57:14 UT · 50 ms 11:16:01 UT · 40 ms 11:00:31 UT · 60 ms · over-exposed 11:02:09 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.