Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 9 July 2025

‹ 07.07.2025 2025 10.07.2025 ›

Photosphere sunspot drawing and RDS evaluation

09.07.2025 photosphere drawing

High-resolution scan (3230 px)

Time
07:30 UT
Observer
Burçin TANIK
g
6
f
25
R
85
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HR_ – 1Group 1 · HR_ – 1 Group 2 · CSI – 10Group 2 · CSI – 10 Group 3 · EKI – 8Group 3 · EKI – 8 Group 4 · AX_ – 1Group 4 · AX_ – 1 Group 5 · AX_ – 1Group 5 · AX_ – 1 Group 6 · CAO – 4Group 6 · CAO – 4
RDS data file (.gzd) 
[Gözlem]
Tarih=9.07.2025
Saat=07:30
Gözlemci=Burçin TANIK
KontrolEden=Süleyman FİŞEK
Durumaçısı=1.16
Enlemaçısı=3.75
Boylamaçısı=97.92
Boylamfark=2
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.5
Sırano=20294
AyRasatNo=8
RasatÖnceki=07.07.2025
RasatSonraki=10.07.2025

[Leke Grupları]
Grupsayısı=6:3:3
LekeSayısı=25:19:6
RölatifSayı=85:49:36
01=HR_ 01 +22.630 +70.957 168.877 +0.000 0000 0 +22.428 +72.740 +21.699 +69.841 +22.630 +71.907 +22.630 +70.700
02=CSI 10 +17.790 +08.648 106.568 +0.000 0000 0 +18.970 +11.500 +16.610 +06.291 +17.790 +10.805 +17.790 +06.491
03=EKI 08 +19.870 -76.416 021.504 15.524 0000 0 +20.615 -71.328 +17.558 -81.504 +18.197 -72.993 +19.701 -78.418
04=AX_ 01 -09.334 +38.950 136.870 -1.000 0000 0 -09.334 +38.950 -09.334 +38.950
05=AX_ 01 -09.570 -13.599 084.321 -1.000 0000 0 -09.570 -13.599 -09.570 -13.599
06=CAO 04 -08.252 -53.617 044.303 18.851 0000 0 -06.866 -50.547 -09.639 -56.687 -07.677 -51.527 -09.256 -56.158
20250709.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 →

2025/20250709_bto · BTO · 4 frames · 85.7 MB · 07:42:05–07:47:20 UT

07:45:51 UT · 20 ms 07:42:05 UT · 30 ms 07:43:47 UT · 60 ms · over-exposed 07:47:20 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.