Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 13 August 2025

‹ 12.08.2025 2025 14.08.2025 ›

Photosphere sunspot drawing and RDS evaluation

13.08.2025 photosphere drawing

High-resolution scan (3228 px)

Time
08:30 UT
Observer
Burçin TANIK
g
10
f
69
R
169
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · DSI – 9Group 1 · DSI – 9 Group 2 · EAC – 25Group 2 · EAC – 25 Group 3 · AX_ – 2Group 3 · AX_ – 2 Group 4 · HA_ – 2Group 4 · HA_ – 2 Group 5 · CSO – 2Group 5 · CSO – 2 Group 6 · BXI – 10Group 6 · BXI – 10 Group 7 · ?__ – 3Group 7 · ?__ – 3 Group 8 · CRO – 4Group 8 · CRO – 4 Group 9 · HR_ – 3Group 9 · HR_ – 3 Group 10 · BXI – 9Group 10 · BXI – 9
RDS data file (.gzd) 
[Gözlem]
Tarih=13.08.2025
Saat=08:30
Gözlemci=Burçin TANIK
KontrolEden=Olcay PLEVNE
Durumaçısı=15.48
Enlemaçısı=6.55
Boylamaçısı=354.4
Boylamfark=2
GKalite=3
GDurum=G.T , B.A
Kuzeyaçısı=-0.8
Sırano=20322
AyRasatNo=10
RasatÖnceki=12.08.2025
RasatSonraki=14.08.2025

[Leke Grupları]
Grupsayısı=10:7:3
LekeSayısı=69:53:16
RölatifSayı=169:123:46
01=DSI 09 +10.355 +63.679 058.790 +0.000 0000 0 +12.380 +67.897 +08.673 +59.462 +10.355 +67.697 +10.355 +59.662
02=EAC 25 +08.514 +35.260 029.660 10.693 0000 0 +11.155 +40.418 +05.873 +30.103 +07.636 +39.800 +08.975 +31.897
03=AX_ 02 +28.188 +34.918 029.318 +0.000 0000 0 +28.803 +35.235 +27.573 +34.600 +28.188 +34.736 +28.188 +35.100
04=HA_ 02 +22.420 +34.241 028.641 +0.000 0000 0 +22.957 +34.884 +21.128 +33.599 +22.420 +34.384 +22.420 +34.980
05=CSO 02 +17.664 +13.583 007.983 43.329 0000 0 +19.464 +15.533 +15.865 +11.633 +18.753 +14.470 +16.536 +12.117
06=BXI 10 +11.758 -04.185 350.215 45.464 0000 0 +13.410 -02.602 +10.107 -05.767 +10.624 -03.253 +12.610 -05.209
07=?__ 03 +03.115 -06.470 347.930 +0.000 0000 0 +04.664 -05.760 +01.567 -07.863 +03.115 -05.918 +03.115 -07.210
08=CRO 04 -11.937 +15.213 009.613 +0.000 0000 0 -11.287 +17.402 -12.587 +13.250 -11.937 +16.789 -11.937 +13.637
09=HR_ 03 -10.804 -34.827 319.573 +0.000 0000 0 -10.257 -34.406 -11.351 -35.247 -10.804 -34.906 -10.804 -34.748
10=BXI 09 -04.317 -54.607 299.793 17.479 0000 0 -02.793 -50.600 -05.841 -58.615 -03.575 -51.610 -05.339 -57.222
20250813.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 →

2025/20250813_bto · BTO · 3 frames · 64.3 MB · 08:36:00–08:40:50 UT

08:40:50 UT · 30 ms 08:37:22 UT · 70 ms · over-exposed 08:36:00 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.