Images 30.04.2025 · Istanbul University Observatory Solar Observations

Solar Images Wednesday, 30 April 2025

‹ 29.04.2025 2025 03.05.2025 ›

Photosphere sunspot drawing and RDS evaluation

High-resolution scan (3234 px)

Time: 09:00 UT
Observer: Burçin TANIK
g: 4
f: 34
R: 74
Seeing: 3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CHO – 2

Group 2 · EKC – 18

Group 3 · CAO – 6

Group 4 · ?__ – 8

RDS data file (.gzd)

[Gözlem]
Tarih=30.04.2025
Saat=09:00
Gözlemci=Burçin TANIK
KontrolEden=Korhan YELKENCİ
Durumaçısı=-24.19
Enlemaçısı=-4.24
Boylamaçısı=303.28
Boylamfark=2
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.2
Sırano=20234
AyRasatNo=18
RasatÖnceki=29.04.2025
RasatSonraki=03.05.2025

[Leke Grupları]
Grupsayısı=4:2:2
LekeSayısı=34:20:14
RölatifSayı=74:40:34
01=CHO 02 +04.945 -00.482 302.798 +0.000 0000 0 +06.530 +01.801 +03.838 -02.764 +04.945 +01.601 +04.945 -02.564
02=EKC 18 +06.971 -62.464 240.816 26.288 0000 0 +10.878 -55.317 +03.640 -69.611 +05.133 -58.727 +09.208 -67.180
03=CAO 06 -11.805 +63.865 007.145 +0.000 0000 0 -11.480 +66.724 -12.561 +61.600 -11.805 +65.927 -11.805 +61.803
04=?__ 08 -19.410 +20.561 323.841 +0.000 0000 0 -17.716 +21.568 -21.103 +19.554 -19.410 +21.680 -19.410 +20.540

20250430.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 →

2025/20250430_bto · BTO · 3 frames · 64.3 MB · 09:27:47–09:29:51 UT

09:28:52 UT · 20 ms

09:29:51 UT · 40 ms

09:27:47 UT · 50 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.