Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Monday, 21 July 2025

‹ 20.07.2025 2025 22.07.2025 ›

Photosphere sunspot drawing and RDS evaluation

21.07.2025 photosphere drawing

High-resolution scan (3229 px)

Time
07:05 UT
Observer
Süleyman FİŞEK
g
14
f
54
R
194
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HA_ – 1Group 1 · HA_ – 1 Group 2 · EKI – 12Group 2 · EKI – 12 Group 3 · DHI – 6Group 3 · DHI – 6 Group 4 · CRI – 5Group 4 · CRI – 5 Group 5 · AX_ – 1Group 5 · AX_ – 1 Group 6 · AX_ – 2Group 6 · AX_ – 2 Group 7 · EHC – 9Group 7 · EHC – 9 Group 8 · AX_ – 1Group 8 · AX_ – 1 Group 9 · AX_ – 2Group 9 · AX_ – 2 Group 10 · AX_ – 1Group 10 · AX_ – 1 Group 11 · AX_ – 1Group 11 · AX_ – 1 Group 12 · AX_ – 1Group 12 · AX_ – 1 Group 13 · AX_ – 1Group 13 · AX_ – 1 Group 14 · CSI – 11Group 14 · CSI – 11
RDS data file (.gzd) 
[Gözlem]
Tarih=21.07.2025
Saat=07:05
Gözlemci=Süleyman FİŞEK
KontrolEden=Olcay PLEVNE
Durumaçısı=6.45
Enlemaçısı=4.91
Boylamaçısı=299.36
Boylamfark=3
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.2
Sırano=20304
AyRasatNo=18
RasatÖnceki=20.07.2025
RasatSonraki=22.07.2025

[Leke Grupları]
Grupsayısı=14:8:6
LekeSayısı=54:37:17
RölatifSayı=194:117:77
01=HA_ 01 +20.750 +76.145 015.505 -1.000 0000 0 +21.335 +78.687 +18.815 +73.603
02=EKI 12 +25.580 +66.390 005.750 +0.000 0000 0 +27.871 +73.244 +23.288 +59.537 +25.580 +73.440 +25.580 +59.737
03=DHI 06 +02.862 +42.134 341.494 +0.000 0000 0 +04.705 +43.886 +01.190 +40.381 +02.862 +43.686 +02.862 +40.581
04=CRI 05 +10.867 +25.227 324.587 +0.000 0000 0 +12.248 +27.312 +09.486 +23.142 +10.867 +27.112 +10.867 +23.342
05=AX_ 01 +07.347 -00.910 298.450 -1.000 0000 0 +07.347 -00.910 +07.347 -00.910
06=AX_ 02 +08.760 -19.861 279.499 +0.000 0000 0 +08.930 -18.541 +07.222 -21.182 +00.000 +00.000 +00.000 +00.000
07=EHC 09 +17.426 -52.290 247.700 +0.000 0000 0 +19.957 -46.373 +14.895 -58.207 +17.426 -46.573 +17.426 -58.700
08=AX_ 01 +09.406 -70.496 228.864 -1.000 0000 0 +09.406 -70.496 +09.406 -70.496
09=AX_ 02 -06.665 +63.850 002.445 +0.000 0000 0 -06.363 +63.949 -06.967 +62.221 -06.665 +64.214 -06.665 +63.486
10=AX_ 01 -12.176 +52.787 352.146 -1.000 0000 0 -12.176 +52.787 -12.176 +52.787
11=AX_ 01 -00.574 +30.745 330.105 -1.000 0000 0 -00.574 +30.745 -00.574 +30.745
12=AX_ 01 -14.559 +07.522 306.882 -1.000 0000 0 -14.559 +07.522 -14.559 +07.522
13=AX_ 01 -15.925 -03.510 296.309 -1.000 0000 0 -15.925 -03.510 -15.925 -03.510
14=CSI 11 -13.736 -51.126 248.234 +0.000 0000 0 -12.304 -47.980 -15.168 -55.154 -13.736 -47.298 -13.736 -54.954
20250721.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 →

2025/20250721_sf · SF · 6 frames · 128.6 MB · 07:18:15–07:21:14 UT

07:19:44 UT · 3 ms 07:21:14 UT · 6 ms 07:20:44 UT · 3 ms 07:18:15 UT · 3 ms 07:19:14 UT · 6 ms 07:20:14 UT · 6 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.