Images 21.04.2026 · Istanbul University Observatory Solar Observations

Solar Images Tuesday, 21 April 2026

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Photosphere sunspot drawing and RDS evaluation

High-resolution scan (3230 px)

Time: 09:00 UT
Observer: Y.ALTIKULAÇ+O.P.
g: 3
f: 18
R: 48
Seeing: 3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · EHI – 12

Group 2 · BXI – 5

Group 3 · HS_ – 1

RDS data file (.gzd)

[Gözlem]
Tarih=21.04.2026
Saat=09:00
Gözlemci=Y.ALTIKULAÇ+O.P.
KontrolEden=Ergün EGE
Durumaçısı=-25.48
Enlemaçısı=-5.11
Boylamaçısı=284.64
Boylamfark=2
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.6
Sırano=20452
AyRasatNo=13
RasatÖnceki=20.04.2026
RasatSonraki=23.04.2026

[Leke Grupları]
Grupsayısı=3:2:1
LekeSayısı=18:17:1
RölatifSayı=48:37:11
01=EHI 12 +12.975 +27.653 312.293 +0.000 0000 0 +16.740 +34.232 +09.211 +21.740 +12.975 +34.320 +12.975 +21.274
02=BXI 05 +15.287 -58.889 225.751 +0.000 0000 0 +16.695 -55.376 +13.879 -62.402 +15.287 -55.576 +15.287 -62.202
03=HS_ 01 -09.554 -73.230 211.617 +0.000 0000 0 -08.756 -71.744 -10.352 -74.301 -09.554 -72.451 -09.554 -74.900

20260421.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.