Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Sunday, 24 August 2025

‹ 22.08.2025 2025 25.08.2025 ›

Photosphere sunspot drawing and RDS evaluation

24.08.2025 photosphere drawing

High-resolution scan (3230 px)

Time
11:10 UT
Observer
Ergün EGE
g
7
f
23
R
93
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HR_ – 1Group 1 · HR_ – 1 Group 2 · CAO – 5Group 2 · CAO – 5 Group 3 · EHC – 13Group 3 · EHC – 13 Group 4 · HS_ – 1Group 4 · HS_ – 1 Group 5 · HR_ – 1Group 5 · HR_ – 1 Group 6 · HR_ – 1Group 6 · HR_ – 1 Group 7 · HS_ – 1Group 7 · HS_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=24.08.2025
Saat=11:10
Gözlemci=Ergün EGE
KontrolEden=Ergün EGE
Durumaçısı=19.03
Enlemaçısı=7.02
Boylamaçısı=207.56
Boylamfark=0
GKalite=3
GDurum=B.A
Kuzeyaçısı=-0.5
Sırano=20330
AyRasatNo=18
RasatÖnceki=22.08.2025
RasatSonraki=25.08.2025

[Leke Grupları]
Grupsayısı=7:3:4
LekeSayısı=23:19:4
RölatifSayı=93:49:44
01=HR_ 01 +08.600 +15.676 223.236 +0.000 0000 0 +08.489 +16.410 +07.631 +15.312 +08.600 +15.725 +08.600 +15.627
02=CAO 05 +02.660 -21.120 186.440 +0.000 0000 0 +03.258 -18.783 +02.630 -23.458 +02.660 -19.283 +02.660 -22.958
03=EHC 13 +11.900 -36.725 170.835 +0.000 0000 0 +13.910 -30.325 +08.928 -43.126 +11.900 -30.525 +11.900 -42.926
04=HS_ 01 -08.382 +00.233 207.793 +0.000 0000 0 -07.850 +01.880 -08.914 -00.622 -08.382 +00.984 -08.382 -00.518
05=HR_ 01 -17.665 -60.519 147.410 +0.000 0000 0 -17.212 -59.636 -18.117 -61.402 -17.665 -60.136 -17.665 -60.902
06=HR_ 01 -11.490 -71.260 136.300 +0.000 0000 0 -10.565 -70.470 -11.533 -72.473 -11.490 -70.758 -11.490 -71.762
07=HS_ 01 -15.576 -72.336 135.224 +0.000 0000 0 -14.979 -70.744 -16.172 -73.929 -15.576 -71.243 -15.576 -73.428
20250824.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 →

2025/20250824 · · 11 frames · 235.7 MB · 11:13:03–11:23:01 UT

11:21:00 UT · 30 ms 11:22:01 UT · 50 ms · over-exposed 11:13:03 UT · 40 ms 11:16:02 UT · 30 ms 11:17:01 UT · 50 ms · over-exposed 11:17:36 UT · 50 ms · over-exposed 11:21:31 UT · 50 ms · over-exposed 11:18:36 UT · 60 ms · over-exposed 11:22:31 UT · 60 ms · over-exposed 11:23:01 UT · 70 ms · over-exposed 11:19:35 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.