Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 19 May 2021

‹ 18.05.2021 2021 20.05.2021 ›

Photosphere sunspot drawing and RDS evaluation

19.05.2021 photosphere drawing

High-resolution scan (3224 px)

Time
09:00 UT
Observer
Olcay PLEVNE
g
2
f
3
R
23
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HS_ – 1Group 1 · HS_ – 1 Group 2 · CSO – 2Group 2 · CSO – 2
RDS data file (.gzd) 
[Gözlem]
Tarih=19.05.2021
Saat=09:00
Gözlemci=Olcay PLEVNE
KontrolEden=Süleyman FİŞEK
Durumaçısı=-19.64
Enlemaçısı=-2.17
Boylamaçısı=255.49
Boylamfark=2
GKalite=3
GDurum=K.T
Kuzeyaçısı=0.0
Sırano=19174
AyRasatNo=3
RasatÖnceki=18.05.2021
RasatSonraki=20.05.2021

[Leke Grupları]
Grupsayısı=2:2:0
LekeSayısı=3:3:0
RölatifSayı=23:23:0
01=HS_ 01 +17.130 +79.319 334.809 +0.000 0000 0 +17.866 +82.803 +16.160 +75.835 +17.130 +82.303 +17.130 +76.335
02=CSO 02 +20.405 -60.714 194.776 +0.000 0000 0 +21.607 -58.391 +19.202 -63.380 +20.405 -58.591 +20.405 -62.838
20210519.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 →

2021/20210519_op · OP · 4 frames · 85.7 MB · 09:09:59–09:14:10 UT

09:09:59 UT · 30 ms 09:12:17 UT · 30 ms 09:13:06 UT · 60 ms · over-exposed 09:14:10 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.