Images 21.11.2025 · Istanbul University Observatory Solar Observations

Solar Images Friday, 21 November 2025

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Photosphere sunspot drawing and RDS evaluation

High-resolution scan (3231 px)

Time: 07:20 UT
Observer: Ergün EGE
g: 4
f: 9
R: 49
Seeing: 3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HR_ – 1

Group 2 · HA_ – 2

Group 3 · BXO – 5

Group 4 · AX_ – 1

RDS data file (.gzd)

[Gözlem]
Tarih=21.11.2025
Saat=07:20
Gözlemci=Ergün EGE
KontrolEden=Ergün EGE
Durumaçısı=19.45
Enlemaçısı=2.1
Boylamaçısı=115.33
Boylamfark=3
GKalite=3
GDurum=H.S
Kuzeyaçısı=-0.1
Sırano=20391
AyRasatNo=14
RasatÖnceki=20.11.2025
RasatSonraki=22.11.2025

[Leke Grupları]
Grupsayısı=4:2:2
LekeSayısı=9:3:6
RölatifSayı=49:23:26
01=HR_ 01 +01.810 -50.112 065.218 +0.000 0000 0 +02.321 -49.287 +01.299 -50.936 +01.810 -49.787 +01.810 -50.437
02=HA_ 02 +17.207 -74.175 041.155 +0.000 0000 0 +18.286 -72.612 +16.127 -75.737 +17.207 -73.113 +17.207 -75.238
03=BXO 05 -06.696 +60.877 176.207 +0.000 0000 0 -04.633 +64.435 -08.760 +57.319 -06.696 +64.235 -06.696 +57.519
04=AX_ 01 -01.360 -60.898 054.432 +0.000 0000 0 -01.700 -60.309 -01.651 -61.486 -01.360 -60.809 -01.360 -60.986

20251121.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 →

2025/20251121 · · 9 frames · 192.8 MB · 07:27:25–07:34:43 UT

07:30:43 UT · 40 ms