Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Thursday, 20 April 2023

‹ 19.04.2023 2023 21.04.2023 ›

Photosphere sunspot drawing and RDS evaluation

20.04.2023 photosphere drawing

High-resolution scan (3234 px)

Time
10:55 UT
Observer
Hikmet ÇAKMAK
g
5
f
40
R
90
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · FAI – 25Group 1 · FAI – 25 Group 2 · AX_ – 2Group 2 · AX_ – 2 Group 3 · CAO – 5Group 3 · CAO – 5 Group 4 · BXI – 5Group 4 · BXI – 5 Group 5 · BXO – 3Group 5 · BXO – 3
RDS data file (.gzd) 
[Gözlem]
Tarih=20.04.2023
Saat=10:55
Gözlemci=Hikmet ÇAKMAK
KontrolEden=Başar COŞKUNOĞLU
Durumaçısı=-25.61
Enlemaçısı=-5.21
Boylamaçısı=2.67
Boylamfark=1
GKalite=3
GDurum=G.T , H.S
Kuzeyaçısı=-0.3
Sırano=19694
AyRasatNo=12
RasatÖnceki=19.04.2023
RasatSonraki=21.04.2023

[Leke Grupları]
Grupsayısı=5:1:4
LekeSayısı=40:25:15
RölatifSayı=90:35:55
01=FAI 25 +11.714 +21.640 024.310 07.421 0000 0 +13.804 +29.916 +09.625 +13.364 +12.439 +28.320 +10.571 +13.822
02=AX_ 02 -21.600 +25.574 028.244 +0.000 0000 0 -20.654 +26.890 -21.466 +25.580 -21.600 +25.729 -21.600 +25.419
03=CAO 05 -23.194 +12.681 015.351 09.946 0000 0 -21.842 +17.737 -24.546 +07.625 -22.556 +17.174 -24.161 +07.979
04=BXI 05 -21.637 -04.966 357.704 16.634 0000 0 -20.772 -02.769 -22.502 -07.164 -21.167 -03.338 -22.185 -06.749
05=BXO 03 -08.897 -40.103 322.567 +0.000 0000 0 -08.288 -35.948 -09.506 -44.258 -08.897 -36.448 -08.897 -43.758
20230420.gzd

Chromosphere (H-α) FITS frames

H-α

The images are made automatically with a fixed, gentle rule: uneven illumination and most of the limb darkening are removed, and the brightness is shown on a linear scale (no sharpening); prominences get their own scale outside the limb. Frames are ordered by sharpness (seeing); frames without the Sun (darks, bias) come last. Method →

2023/20230420_hc · HC · 4 frames · 85.7 MB · 11:05:49–11:11:28 UT

11:05:49 UT · 40 ms 11:08:20 UT · 40 ms 11:11:28 UT · 40 ms 11:09:22 UT · 80 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.