Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Tuesday, 20 February 2024

‹ 13.02.2024 2024 21.02.2024 ›

Photosphere sunspot drawing and RDS evaluation

20.02.2024 photosphere drawing

High-resolution scan (3237 px)

Time
08:15 UT
Observer
Burçin TANIK
g
2
f
16
R
36
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HH_ – 1Group 1 · HH_ – 1 Group 2 · FHC – 15Group 2 · FHC – 15
RDS data file (.gzd) 
[Gözlem]
Tarih=20.02.2024
Saat=08:15
Gözlemci=Burçin TANIK
KontrolEden=Olcay PLEVNE
Durumaçısı=-18.92
Enlemaçısı=-7
Boylamaçısı=284.53
Boylamfark=2
GKalite=3
GDurum=G.T , K.T
Kuzeyaçısı=-0.9
Sırano=19919
AyRasatNo=11
RasatÖnceki=13.02.2024
RasatSonraki=21.02.2024

[Leke Grupları]
Grupsayısı=2:2:0
LekeSayısı=16:16:0
RölatifSayı=36:36:0
01=HH_ 01 +26.841 -04.250 280.280 +0.000 0000 0 +28.880 -02.854 +25.594 -05.647 +26.841 -03.353 +26.841 -05.147
02=FHC 15 +18.187 -63.330 221.200 12.272 0000 0 +21.268 -54.865 +15.106 -71.796 +19.197 -57.556 +16.797 -68.667
20240220.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 →

2024/20240220_bto · BTO · 6 frames · 128.6 MB · 08:19:51–08:24:59 UT

08:21:32 UT · 40 ms 08:23:18 UT · 30 ms 08:24:59 UT · 30 ms 08:19:51 UT · 70 ms · over-exposed 08:22:28 UT · 70 ms · over-exposed 08:24:10 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.