Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Thursday, 30 October 2025

‹ 29.10.2025 2025 31.10.2025 ›

Photosphere sunspot drawing and RDS evaluation

30.10.2025 photosphere drawing

High-resolution scan (3230 px)

Time
09:25 UT
Observer
Korhan YELKENCİ
g
5
f
23
R
73
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CAI – 6Group 1 · CAI – 6 Group 2 · CAI – 10Group 2 · CAI – 10 Group 3 · HS_ – 1Group 3 · HS_ – 1 Group 4 · BXI – 5Group 4 · BXI – 5 Group 5 · AX_ – 1Group 5 · AX_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=30.10.2025
Saat=09:25
Gözlemci=Korhan YELKENCİ
KontrolEden=Ergün EGE
Durumaçısı=24.7
Enlemaçısı=4.55
Boylamaçısı=44.23
Boylamfark=1
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.3
Sırano=20376
AyRasatNo=19
RasatÖnceki=29.10.2025
RasatSonraki=31.10.2025

[Leke Grupları]
Grupsayısı=5:2:3
LekeSayısı=23:16:7
RölatifSayı=73:36:37
01=CAI 06 +16.653 +42.218 086.448 16.390 0000 0 +17.862 +45.939 +15.443 +38.496 +17.662 +45.739 +15.643 +38.696
02=CAI 10 +04.656 +16.503 060.733 47.196 0000 0 +08.810 +19.789 +01.230 +13.218 +07.871 +19.536 +01.430 +13.535
03=HS_ 01 -05.129 +58.229 102.459 +0.000 0000 0 -04.613 +58.809 -05.645 +57.649 -05.129 +58.309 -05.129 +58.149
04=BXI 05 -11.436 +16.217 060.447 +0.000 0000 0 -10.680 +18.823 -12.192 +13.612 -11.436 +18.322 -11.436 +14.111
05=AX_ 01 -08.542 -63.830 341.147 -1.000 0000 0 -08.542 -63.830 -08.542 -63.830
20251030.gzd

Chromosphere (H-α) FITS frames

No chromosphere observation for this day.

Coronado H-α animations from frame sequences

No Coronado observation for this day.