Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Saturday, 21 August 2021

‹ 20.08.2021 2021 22.08.2021 ›

Photosphere sunspot drawing and RDS evaluation

21.08.2021 photosphere drawing

High-resolution scan (3231 px)

Time
07:45 UT
Observer
Oğuzhan ÇAKIR
g
2
f
5
R
25
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · AX_ – 4Group 1 · AX_ – 4 Group 2 · HK_ – 1Group 2 · HK_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=21.08.2021
Saat=07:45
Gözlemci=Oğuzhan ÇAKIR
KontrolEden=Başar COŞKUNOĞLU
Durumaçısı=18.08
Enlemaçısı=6.91
Boylamaçısı=92.5
Boylamfark=2
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.2
Sırano=19253
AyRasatNo=21
RasatÖnceki=20.08.2021
RasatSonraki=22.08.2021

[Leke Grupları]
Grupsayısı=2:2:0
LekeSayısı=5:5:0
RölatifSayı=25:25:0
01=AX_ 04 +13.339 +31.477 123.977 +0.000 0000 0 +13.996 +32.550 +12.682 +30.405 +13.339 +32.490 +13.339 +30.904
02=HK_ 01 +18.756 -83.846 008.654 +0.000 0000 0 +20.400 -80.880 +17.508 -86.811 +18.756 -81.381 +18.756 -86.312
20210821.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 →

2021/20210821_oc · OC · 4 frames · 85.7 MB · 08:07:31–08:17:34 UT

08:07:31 UT · 30 ms 08:16:04 UT · 30 ms 08:09:26 UT · 60 ms · over-exposed 08:17:34 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.