Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Saturday, 30 August 2025

‹ 29.08.2025 2025 02.09.2025 ›

Photosphere sunspot drawing and RDS evaluation

30.08.2025 photosphere drawing

High-resolution scan (3216 px)

Time
08:55 UT
Observer
Burçin TANIK
g
9
f
101
R
191
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · ?__ – 6Group 1 · ?__ – 6 Group 2 · ?__ – 12Group 2 · ?__ – 12 Group 3 · HS_ – 1Group 3 · HS_ – 1 Group 4 · HS_ – 1Group 4 · HS_ – 1 Group 5 · ?__ – 2Group 5 · ?__ – 2 Group 6 · CSI – 5Group 6 · CSI – 5 Group 7 · FKC – 65Group 7 · FKC – 65 Group 8 · DAO – 5Group 8 · DAO – 5 Group 9 · HK_ – 4Group 9 · HK_ – 4
RDS data file (.gzd) 
[Gözlem]
Tarih=30.08.2025
Saat=08:55
Gözlemci=Burçin TANIK
KontrolEden=Korhan YELKENCİ
Durumaçısı=20.67
Enlemaçısı=7.16
Boylamaçısı=129.52
Boylamfark=2
GKalite=3
GDurum=H.S
Kuzeyaçısı=0.2
Sırano=20334
AyRasatNo=22
RasatÖnceki=29.08.2025
RasatSonraki=02.09.2025

[Leke Grupları]
Grupsayısı=9:5:4
LekeSayısı=101:22:79
RölatifSayı=191:72:119
01=?__ 06 +10.499 +43.910 173.430 +0.000 0000 0 +12.470 +47.700 +08.951 +40.812 +10.499 +46.854 +10.499 +40.966
02=?__ 12 +03.456 -14.700 115.513 +0.000 0000 0 +06.495 -11.200 +00.416 -16.994 +03.456 -12.303 +03.456 -17.970
03=HS_ 01 +17.330 -63.167 066.353 +0.000 0000 0 +18.840 -61.944 +16.576 -64.390 +17.330 -62.444 +17.330 -63.890
04=HS_ 01 +09.288 -67.299 062.221 +0.000 0000 0 +10.328 -66.780 +08.249 -68.519 +09.288 -66.930 +09.288 -67.669
05=?__ 02 +29.134 -82.348 047.173 +0.000 0000 0 +30.638 -79.400 +27.630 -85.295 +29.134 -79.900 +29.134 -84.796
06=CSI 05 -08.190 +45.770 174.597 +0.000 0000 0 -07.201 +50.340 -09.178 +40.121 -08.190 +49.834 -08.190 +40.321
07=FKC 65 -19.289 +01.278 130.798 17.484 0000 0 -14.681 +09.825 -23.897 -07.270 -16.817 +07.206 -20.164 -03.495
08=DAO 05 -20.613 -12.771 116.749 +0.000 0000 0 -19.547 -10.564 -21.679 -14.978 -20.613 -10.764 -20.613 -14.778
09=HK_ 04 -14.902 -18.507 111.130 +0.000 0000 0 -13.465 -17.230 -16.338 -19.783 -14.902 -17.730 -14.902 -19.284
20250830.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 →

2025/20250830_bto · BTO · 4 frames · 85.7 MB · 09:01:40–09:09:34 UT

09:09:34 UT · 20 ms 09:04:16 UT · 30 ms 09:07:22 UT · 70 ms 09:01:40 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.