Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 29 January 2025

‹ 28.01.2025 2025 31.01.2025 ›

Photosphere sunspot drawing and RDS evaluation

29.01.2025 photosphere drawing

High-resolution scan (3231 px)

Time
09:20 UT
Observer
Burçin TANIK
g
6
f
34
R
94
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CSO – 5Group 1 · CSO – 5 Group 2 · DAI – 12Group 2 · DAI – 12 Group 3 · HK_ – 2Group 3 · HK_ – 2 Group 4 · AX_ – 1Group 4 · AX_ – 1 Group 5 · BXI – 5Group 5 · BXI – 5
RDS data file (.gzd) 
[Gözlem]
Tarih=29.01.2025
Saat=09:20
Gözlemci=Burçin TANIK
KontrolEden=Ergün EGE
Durumaçısı=-11.17
Enlemaçısı=-5.83
Boylamaçısı=62.88
Boylamfark=1
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.5
Sırano=20184
AyRasatNo=20
RasatÖnceki=28.01.2025
RasatSonraki=31.01.2025

[Leke Grupları]
Grupsayısı=6:3:3
LekeSayısı=34:19:15
RölatifSayı=94:49:45
01=CSO 05 +17.153 -62.975 359.905 33.593 0000 0 +19.115 -59.567 +15.191 -66.383 +15.854 -61.151 +17.849 -64.158
02=DAI 12 +10.689 -65.396 357.484 25.273 0000 0 +13.381 -59.791 +07.996 -71.000 +11.952 -67.185 +09.275 -61.501
03=HK_ 02 +08.910 -74.219 348.661 -1.000 0000 0 +10.162 -72.400 +07.658 -76.398
04=AX_ 01 -18.822 +76.154 139.340 -1.000 0000 0 -18.822 +76.154 -18.822 +76.154
05=BXI 05 -10.968 +03.742 066.622 +0.000 0000 0 -10.199 +05.269 -11.737 +02.215 -10.968 +04.769 -10.968 +02.715
06=?__ 09 -18.593 -42.186 020.694 -1.000 0000 0 -16.923 -40.742 -20.263 -43.630
20250129.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 →

2025/20250129_bto · BTO · 4 frames · 85.7 MB · 09:27:50–09:32:11 UT

09:29:28 UT · 30 ms 09:30:51 UT · 40 ms 09:27:50 UT · 60 ms · over-exposed 09:32:11 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.