Images 20.04.2021 · Istanbul University Observatory Solar Observations

Solar Images Tuesday, 20 April 2021

‹ 16.04.2021 2021 21.04.2021 ›

Photosphere sunspot drawing and RDS evaluation

High-resolution scan (3230 px)

Time: 07:40 UT
Observer: Korhan YELKENCİ
g: 4
f: 27
R: 67
Seeing: 3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · DAC – 16

Group 2 · AX_ – 1

Group 3 · DAC – 9

Group 4 · HS_ – 1

RDS data file (.gzd)

[Gözlem]
Tarih=20.04.2021
Saat=07:40
Gözlemci=Korhan YELKENCİ
KontrolEden=Olcay PLEVNE
Durumaçısı=-25.58
Enlemaçısı=-5.17
Boylamaçısı=279.57
Boylamfark=2
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.7
Sırano=19165
AyRasatNo=11
RasatÖnceki=16.04.2021
RasatSonraki=21.04.2021

[Leke Grupları]
Grupsayısı=4:2:2
LekeSayısı=27:17:10
RölatifSayı=67:37:30
01=DAC 16 +17.387 +50.712 330.282 17.230 0000 0 +18.952 +55.376 +15.823 +46.480 +18.718 +55.260 +16.230 +46.297
02=AX_ 01 +12.693 +36.295 315.865 -1.000 0000 0 +12.693 +36.295 +12.693 +36.295
03=DAC 09 -24.944 -17.797 261.773 31.330 0000 0 -22.142 -13.457 -27.745 -22.137 -22.572 -13.704 -27.445 -21.851
04=HS_ 01 -17.308 -74.618 204.952 +0.000 0000 0 -16.584 -73.499 -18.310 -75.737 -17.308 -73.999 -17.308 -75.237

20210420.gzd

Chromosphere (H-α) FITS frames

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 →

2021/20210420_ky · KY · 15 frames · 321.4 MB · 07:58:57–08:06:08 UT

08:03:34 UT · 40 ms