Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Saturday, 12 August 2023

‹ 11.08.2023 2023 13.08.2023 ›

Photosphere sunspot drawing and RDS evaluation

12.08.2023 photosphere drawing

High-resolution scan (3220 px)

Time
08:40 UT
Observer
O.PLEVNE=K.Y.
g
4
f
30
R
70
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · AX_ – 1Group 1 · AX_ – 1 Group 2 · DAI – 15Group 2 · DAI – 15 Group 3 · BXI – 12Group 3 · BXI – 12 Group 4 · HS_ – 2Group 4 · HS_ – 2
RDS data file (.gzd) 
[Gözlem]
Tarih=12.08.2023
Saat=08:40
Gözlemci=O.PLEVNE=K.Y.
KontrolEden=Ergün EGE
Durumaçısı=14.95
Enlemaçısı=6.47
Boylamaçısı=295.85
Boylamfark=2
GKalite=3
GDurum=K.T
Kuzeyaçısı=0.0
Sırano=19790
AyRasatNo=11
RasatÖnceki=11.08.2023
RasatSonraki=13.08.2023

[Leke Grupları]
Grupsayısı=4:3:1
LekeSayısı=30:28:2
RölatifSayı=70:58:12
01=AX_ 01 +25.286 +51.603 347.453 -1.000 0000 0 +25.286 +51.603 +25.286 +51.603
02=DAI 15 +14.932 +35.203 331.530 +0.000 0000 0 +17.543 +38.784 +12.322 +31.621 +14.932 +38.584 +14.932 +31.821
03=BXI 12 +19.115 +08.523 304.373 +0.000 0000 0 +21.417 +12.190 +16.814 +05.280 +19.115 +11.819 +19.115 +05.228
04=HS_ 02 -22.365 +45.270 341.120 +0.000 0000 0 -20.467 +48.242 -24.262 +42.298 -22.365 +47.742 -22.365 +42.798
20230812.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 →

2023/20230812_op · OP · 4 frames · 85.7 MB · 08:42:37–08:47:02 UT

08:42:37 UT · 40 ms 08:44:18 UT · 40 ms 08:47:02 UT · 60 ms · over-exposed 08:46:19 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.