Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Sunday, 10 August 2025

‹ 09.08.2025 2025 11.08.2025 ›

Photosphere sunspot drawing and RDS evaluation

10.08.2025 photosphere drawing

High-resolution scan (3230 px)

Time
09:15 UT
Observer
Burçin TANIK
g
11
f
56
R
166
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · ERC – 9Group 1 · ERC – 9 Group 2 · HA_ – 2Group 2 · HA_ – 2 Group 3 · CAI – 15Group 3 · CAI – 15 Group 4 · HA_ – 2Group 4 · HA_ – 2 Group 5 · EAI – 19Group 5 · EAI – 19 Group 6 · HS_ – 1Group 6 · HS_ – 1 Group 7 · HA_ – 2Group 7 · HA_ – 2 Group 8 · HS_ – 1Group 8 · HS_ – 1 Group 9 · AX_ – 1Group 9 · AX_ – 1 Group 10 · AX_ – 3Group 10 · AX_ – 3 Group 11 · AX_ – 1Group 11 · AX_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=10.08.2025
Saat=09:15
Gözlemci=Burçin TANIK
KontrolEden=Burçin TANIK
Durumaçısı=14.43
Enlemaçısı=6.39
Boylamaçısı=33.65
Boylamfark=2
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.6
Sırano=20319
AyRasatNo=7
RasatÖnceki=09.08.2025
RasatSonraki=11.08.2025

[Leke Grupları]
Grupsayısı=11:8:3
LekeSayısı=56:51:5
RölatifSayı=166:131:35
01=ERC 09 +05.325 +69.447 103.970 12.880 0000 0 +06.879 +75.851 +03.771 +63.420 +04.368 +72.615 +06.299 +64.138
02=HA_ 02 +12.604 +66.804 100.454 +0.000 0000 0 +13.461 +67.939 +11.748 +65.669 +12.604 +67.439 +12.604 +66.169
03=CAI 15 +10.960 +23.620 056.712 +0.000 0000 0 +11.971 +26.966 +08.222 +19.158 +10.960 +26.766 +10.960 +19.358
04=HA_ 02 +22.565 -02.705 030.945 +0.000 0000 0 +23.476 -01.680 +21.653 -03.731 +22.565 -02.179 +22.565 -03.230
05=EAI 19 +08.629 -06.529 027.121 +0.000 0000 0 +11.770 +00.931 +06.181 -13.988 +08.629 +00.731 +08.629 -13.788
06=HS_ 01 +19.167 -22.550 011.595 +0.000 0000 0 +19.844 -21.323 +18.489 -22.786 +19.167 -22.318 +19.167 -22.781
07=HA_ 02 +11.688 -43.328 350.322 +0.000 0000 0 +12.453 -42.482 +10.924 -44.175 +11.688 -42.981 +11.688 -43.674
08=HS_ 01 +04.883 -44.306 349.344 +0.000 0000 0 +05.418 -43.721 +04.348 -44.892 +04.883 -44.221 +04.883 -44.391
09=AX_ 01 -17.477 +71.433 105.830 -1.000 0000 0 -17.477 +71.433 -17.477 +71.433
10=AX_ 03 -06.952 +51.228 084.878 +0.000 0000 0 -06.578 +52.166 -07.325 +50.290 -06.952 +51.666 -06.952 +50.790
11=AX_ 01 -10.130 -73.123 320.527 -1.000 0000 0 -10.130 -73.123 -10.130 -73.123
20250810.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 →

2025/20250810_bto · BTO · 4 frames · 85.7 MB · 09:24:04–09:30:08 UT

09:24:04 UT · 30 ms 09:27:02 UT · 40 ms 09:28:27 UT · 60 ms · over-exposed 09:30:08 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.