Images 16.05.2025 · Istanbul University Observatory Solar Observations

Solar Images Friday, 16 May 2025

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Photosphere sunspot drawing and RDS evaluation

High-resolution scan (3229 px)

Time: 10:30 UT
Observer: Ergün EGE
g: 5
f: 14
R: 64
Seeing: 3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · AX_ – 1

Group 2 · HH_ – 1

Group 3 · CSI – 7

Group 4 · BXO – 3

RDS data file (.gzd)

[Gözlem]
Tarih=16.05.2025
Saat=10:30
Gözlemci=Ergün EGE
KontrolEden=Süleyman FİŞEK
Durumaçısı=-20.5
Enlemaçısı=-2.51
Boylamaçısı=90.91
Boylamfark=1
GKalite=3
GDurum=G.T , Y.B
Kuzeyaçısı=-0.4
Sırano=20246
AyRasatNo=12
RasatÖnceki=15.05.2025
RasatSonraki=18.05.2025

[Leke Grupları]
Grupsayısı=5:4:1
LekeSayısı=14:12:2
RölatifSayı=64:52:12
01=AX_ 01 +08.449 +63.105 154.150 +0.000 0000 0 +08.793 +63.916 +08.105 +62.294 +08.449 +63.416 +08.449 +62.794
02=HH_ 01 +13.820 -30.904 060.600 -1.000 0000 0 +14.620 -29.446 +11.543 -32.361
03=CSI 07 +17.720 -35.893 055.170 71.921 0000 0 +20.312 -32.814 +15.128 -38.973 +18.884 -35.459 +15.417 -36.592
04=BXO 03 +16.651 -61.722 029.188 +0.000 0000 0 +18.697 -59.300 +14.606 -64.413 +16.651 -59.230 +16.651 -64.213
05=HR_ 02 -12.763 -71.993 018.917 -1.000 0000 0 -11.905 -70.669 -13.621 -73.318

20250516.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 →

2025/20250516_ee · EE · 3 frames · 16.1 MB · 10:38:24–10:41:30 UT

10:38:24 UT · 20 ms

10:40:03 UT · 30 ms

10:41:30 UT · 40 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.