Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 21 July 2021

‹ 20.07.2021 2021 22.07.2021 ›

Photosphere sunspot drawing and RDS evaluation

21.07.2021 photosphere drawing

High-resolution scan (3224 px)

Time
08:15 UT
Observer
Olcay PLEVNE
g
4
f
12
R
52
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CSO – 4Group 1 · CSO – 4 Group 2 · BXO – 2Group 2 · BXO – 2 Group 3 · CAI – 5Group 3 · CAI – 5 Group 4 · AX_ – 1Group 4 · AX_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=21.07.2021
Saat=08:15
Gözlemci=Olcay PLEVNE
KontrolEden=Talar YONTAN
Durumaçısı=6.46
Enlemaçısı=4.91
Boylamaçısı=142.14
Boylamfark=2
GKalite=3
GDurum=K.T
Kuzeyaçısı=0.0
Sırano=19222
AyRasatNo=20
RasatÖnceki=20.07.2021
RasatSonraki=22.07.2021

[Leke Grupları]
Grupsayısı=4:3:1
LekeSayısı=12:11:1
RölatifSayı=52:41:11
01=CSO 04 +24.797 +57.377 199.517 06.317 0000 0 +26.290 +60.980 +23.566 +53.774 +24.892 +59.483 +25.447 +54.460
02=BXO 02 +19.719 -26.164 115.976 +0.000 0000 0 +20.948 -24.771 +18.489 -27.557 +00.000 +00.000 +00.000 +00.000
03=CAI 05 +25.100 -59.489 082.651 14.784 0000 0 +26.460 -55.294 +23.543 -63.684 +24.261 -56.514 +25.984 -63.590
04=AX_ 01 -15.980 +52.320 194.172 -1.000 0000 0 -15.980 +52.320 -15.980 +52.320
20210721.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 →

2021/20210721_op · OP · 4 frames · 85.7 MB · 08:12:42–08:16:22 UT

08:16:22 UT · 60 ms 08:15:34 UT · 60 ms 08:12:42 UT · 40 ms 08:14:32 UT · 40 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.