Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Tuesday, 15 April 2025

‹ 14.04.2025 2025 16.04.2025 ›

Photosphere sunspot drawing and RDS evaluation

15.04.2025 photosphere drawing

High-resolution scan (3220 px)

Time
10:45 UT
Observer
Olcay PLEVNE
g
4
f
27
R
67
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · AX_ – 1Group 1 · AX_ – 1 Group 2 · CAI – 22Group 2 · CAI – 22 Group 3 · HS_ – 1Group 3 · HS_ – 1 Group 4 · EAO – 3Group 4 · EAO – 3
RDS data file (.gzd) 
[Gözlem]
Tarih=15.04.2025
Saat=10:45
Gözlemci=Olcay PLEVNE
KontrolEden=Olcay PLEVNE
Durumaçısı=-25.97
Enlemaçısı=-5.58
Boylamaçısı=140.47
Boylamfark=1
GKalite=3
GDurum=K.T
Kuzeyaçısı=0.0
Sırano=20225
AyRasatNo=9
RasatÖnceki=14.04.2025
RasatSonraki=17.04.2025

[Leke Grupları]
Grupsayısı=4:2:2
LekeSayısı=27:23:4
RölatifSayı=67:43:24
01=AX_ 01 +17.368 +34.254 174.724 -1.000 0000 0 +17.368 +34.254 +17.368 +34.254
02=CAI 22 +07.204 -05.634 134.836 +0.000 0000 0 +09.537 -00.782 +04.872 -10.486 +07.204 -00.982 +07.204 -10.286
03=HS_ 01 -06.981 +38.167 178.637 +0.000 0000 0 -05.942 +39.330 -08.190 +37.301 -06.981 +38.681 -06.981 +37.653
04=EAO 03 -03.490 -74.988 065.482 +0.000 0000 0 -00.894 -71.227 -05.204 -78.749 -03.490 -71.427 -03.490 -78.549
20250415.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.