Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Monday, 28 April 2025

‹ 25.04.2025 2025 29.04.2025 ›

Photosphere sunspot drawing and RDS evaluation

28.04.2025 photosphere drawing

High-resolution scan (3230 px)

Time
08:10 UT
Observer
Korhan YELKENCİ
g
7
f
28
R
98
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CAI – 4Group 1 · CAI – 4 Group 2 · HS_ – 1Group 2 · HS_ – 1 Group 3 · HS_ – 1Group 3 · HS_ – 1 Group 4 · DAI – 9Group 4 · DAI – 9 Group 5 · AX_ – 4Group 5 · AX_ – 4 Group 6 · CAI – 7Group 6 · CAI – 7 Group 7 · AX_ – 2Group 7 · AX_ – 2
RDS data file (.gzd) 
[Gözlem]
Tarih=28.04.2025
Saat=08:10
Gözlemci=Korhan YELKENCİ
KontrolEden=Süleyman FİŞEK
Durumaçısı=-24.53
Enlemaçısı=-4.44
Boylamaçısı=330.17
Boylamfark=2
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.5
Sırano=20232
AyRasatNo=16
RasatÖnceki=25.04.2025
RasatSonraki=29.04.2025

[Leke Grupları]
Grupsayısı=7:2:5
LekeSayısı=28:5:23
RölatifSayı=98:25:73
01=CAI 04 +09.664 +73.528 043.698 12.984 0000 0 +10.767 +77.742 +08.561 +69.314 +10.567 +77.375 +08.761 +69.514
02=HS_ 01 +04.551 -26.611 303.559 +0.000 0000 0 +05.582 -25.622 +03.521 -27.600 +04.551 -26.122 +04.551 -27.100
03=HS_ 01 -32.188 +66.710 036.880 +0.000 0000 0 -31.651 +67.958 -32.726 +65.463 -32.188 +67.457 -32.188 +65.963
04=DAI 09 -13.940 +33.455 003.625 16.753 0000 0 -11.415 +38.533 -14.773 +28.377 -11.653 +38.333 -14.573 +28.577
05=AX_ 04 -26.168 +17.167 347.337 +0.000 0000 0 -25.249 +18.146 -27.870 +16.189 +00.000 +00.000 +00.000 +00.000
06=CAI 07 -19.101 -05.749 324.421 +0.000 0000 0 -17.398 -04.397 -20.804 -07.101 +00.000 +00.000 +00.000 +00.000
07=AX_ 02 -17.218 -28.228 301.942 +0.000 0000 0 -16.790 -27.525 -17.645 -28.931 -17.218 -28.250 -17.218 -28.431
20250428.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.