Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Tuesday, 12 August 2025

‹ 11.08.2025 2025 13.08.2025 ›

Photosphere sunspot drawing and RDS evaluation

12.08.2025 photosphere drawing

High-resolution scan (3228 px)

Time
09:00 UT
Observer
Burçin TANIK
g
9
f
64
R
154
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · DHC – 12Group 1 · DHC – 12 Group 2 · HA_ – 4Group 2 · HA_ – 4 Group 3 · FAC – 31Group 3 · FAC – 31 Group 4 · HS_ – 1Group 4 · HS_ – 1 Group 5 · ?__ – 7Group 5 · ?__ – 7 Group 6 · HR_ – 2Group 6 · HR_ – 2 Group 7 · ?__ – 2Group 7 · ?__ – 2 Group 8 · HA_ – 2Group 8 · HA_ – 2 Group 9 · BXI – 3Group 9 · BXI – 3
RDS data file (.gzd) 
[Gözlem]
Tarih=12.08.2025
Saat=09:00
Gözlemci=Burçin TANIK
KontrolEden=Burçin TANIK
Durumaçısı=15.14
Enlemaçısı=6.5
Boylamaçısı=7.35
Boylamfark=2
GKalite=3
GDurum=G.T
Kuzeyaçısı=-1.0
Sırano=20321
AyRasatNo=9
RasatÖnceki=11.08.2025
RasatSonraki=13.08.2025

[Leke Grupları]
Grupsayısı=9:6:3
LekeSayısı=64:57:7
RölatifSayı=154:117:37
01=DHC 12 +10.446 +51.860 059.210 16.721 0000 0 +12.652 +56.826 +08.240 +46.895 +09.912 +54.470 +11.532 +48.644
02=HA_ 04 +22.815 +23.670 030.417 +0.000 0000 0 +23.689 +23.799 +21.941 +22.335 +22.815 +23.902 +22.815 +23.438
03=FAC 31 +09.272 +20.925 028.275 +0.000 0000 0 +11.452 +28.492 +07.910 +13.359 +09.272 +28.292 +09.272 +13.559
04=HS_ 01 +19.598 +03.577 010.927 +0.000 0000 0 +20.337 +04.329 +18.859 +02.825 +19.598 +03.829 +19.598 +03.325
05=?__ 07 +12.775 -15.662 351.688 +0.000 0000 0 +14.529 -14.359 +11.210 -16.966 +12.775 -14.858 +12.775 -16.465
06=HR_ 02 +05.162 -17.221 350.129 +0.000 0000 0 +05.680 -16.694 +04.645 -17.748 +05.162 -17.194 +05.162 -17.248
07=?__ 02 -06.733 +79.365 086.715 +0.000 0000 0 -06.570 +82.836 -07.409 +75.893 -06.733 +82.336 -06.733 +76.394
08=HA_ 02 -09.448 -45.722 321.628 +0.000 0000 0 -08.484 -44.808 -10.411 -46.636 -09.448 -45.308 -09.448 -46.136
09=BXI 03 -02.844 -64.662 302.688 +0.000 0000 0 -02.320 -61.952 -03.655 -67.372 -02.844 -62.152 -02.844 -67.172
20250812.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 →

2025/20250812_bto · BTO · 5 frames · 107.1 MB · 09:08:18–09:16:14 UT

09:13:59 UT · 20 ms 09:10:55 UT · 30 ms 09:12:10 UT · 50 ms · over-exposed 09:16:14 UT · 70 ms · over-exposed 09:08:18 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.