Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Friday, 1 August 2025

‹ 31.07.2025 2025 04.08.2025 ›

Photosphere sunspot drawing and RDS evaluation

01.08.2025 photosphere drawing

High-resolution scan (3225 px)

Time
07:40 UT
Observer
Burçin TANIK
g
9
f
53
R
143
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · DAI – 6Group 1 · DAI – 6 Group 2 · DAI – 26Group 2 · DAI – 26 Group 3 · CHO – 4Group 3 · CHO – 4 Group 4 · BXI – 9Group 4 · BXI – 9 Group 5 · HS_ – 1Group 5 · HS_ – 1 Group 6 · BXO – 3Group 6 · BXO – 3 Group 7 · HS_ – 1Group 7 · HS_ – 1 Group 8 · CHO – 2Group 8 · CHO – 2 Group 9 · AX_ – 1Group 9 · AX_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=1.08.2025
Saat=07:40
Gözlemci=Burçin TANIK
KontrolEden=Ergün EGE
Durumaçısı=11.01
Enlemaçısı=5.8
Boylamaçısı=153.53
Boylamfark=2
GKalite=3
GDurum=G.T , B.A
Kuzeyaçısı=-0.4
Sırano=20313
AyRasatNo=1
RasatÖnceki=31.07.2025
RasatSonraki=04.08.2025

[Leke Grupları]
Grupsayısı=9:3:6
LekeSayısı=53:36:17
RölatifSayı=143:66:77
01=DAI 06 +24.408 +41.819 195.349 +0.000 0000 0 +25.331 +45.140 +23.485 +38.624 +24.408 +44.814 +24.408 +38.824
02=DAI 26 +10.750 +13.395 166.925 13.340 0000 0 +12.701 +16.884 +08.798 +09.906 +10.219 +15.234 +11.238 +10.825
03=CHO 04 +12.397 -54.950 099.435 29.725 0000 0 +13.806 -51.352 +10.988 -56.838 +11.411 -52.746 +13.178 -55.843
04=BXI 09 -28.262 +62.148 215.678 18.678 0000 0 -26.295 +68.430 -30.229 +56.253 -27.510 +65.442 -29.466 +59.641
05=HS_ 01 -12.919 +53.844 207.374 +0.000 0000 0 -12.173 +54.634 -13.665 +53.540 -12.919 +53.891 -12.919 +53.797
06=BXO 03 -07.723 +42.969 196.499 +0.000 0000 0 -07.530 +45.504 -08.393 +40.434 -07.723 +45.400 -07.723 +40.934
07=HS_ 01 -19.614 +42.537 196.670 +0.000 0000 0 -19.740 +43.229 -20.154 +41.845 -19.614 +42.729 -19.614 +42.345
08=CHO 02 -12.827 -17.613 135.917 +0.000 0000 0 -12.320 -15.602 -13.623 -19.624 -12.827 -16.102 -12.827 -19.124
09=AX_ 01 -12.361 -27.936 125.594 -1.000 0000 0 -12.361 -27.936 -12.361 -27.936
20250801.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 →

2025/20250801_bto · BTO · 1 frames · 21.4 MB · 07:44:06 UT

07:44:06 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.