Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Monday, 19 May 2025

‹ 18.05.2025 2025 20.05.2025 ›

Photosphere sunspot drawing and RDS evaluation

19.05.2025 photosphere drawing

High-resolution scan (3230 px)

Time
05:25 UT
Observer
Korhan YELKENCİ
g
6
f
14
R
74
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HH_ – 1Group 1 · HH_ – 1 Group 2 · HS_ – 2Group 2 · HS_ – 2 Group 3 · BXI – 5Group 3 · BXI – 5 Group 4 · AX_ – 2Group 4 · AX_ – 2 Group 5 · CAI – 3Group 5 · CAI – 3
RDS data file (.gzd) 
[Gözlem]
Tarih=19.05.2025
Saat=05:25
Gözlemci=Korhan YELKENCİ
KontrolEden=Süleyman FİŞEK
Durumaçısı=-19.68
Enlemaçısı=-2.19
Boylamaçısı=54.03
Boylamfark=4
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.5
Sırano=20248
AyRasatNo=14
RasatÖnceki=18.05.2025
RasatSonraki=20.05.2025

[Leke Grupları]
Grupsayısı=6:3:3
LekeSayısı=14:8:6
RölatifSayı=74:38:36
01=HH_ 01 +13.197 +05.609 059.639 -1.000 0000 0 +14.830 +07.970 +11.564 +04.121
02=HS_ 02 +16.887 -02.600 051.430 -1.000 0000 0 +17.660 -01.795 +16.114 -03.405
03=BXI 05 +17.111 -27.523 026.507 40.973 0000 0 +19.567 -24.789 +14.654 -30.258 +19.699 -24.743 +14.426 -30.693
04=AX_ 02 -12.237 -21.798 032.232 +0.000 0000 0 -11.196 -21.307 -13.278 -22.290 -12.237 -21.806 -12.237 -21.790
05=CAI 03 -12.516 -34.591 019.439 +0.000 0000 0 -11.541 -33.390 -13.490 -35.793 +00.000 +00.000 +00.000 +00.000
06=HS_ 01 -13.597 -77.213 336.817 -1.000 0000 0 -12.685 -75.887 -14.510 -78.539
20250519.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.