Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Saturday, 18 January 2025

‹ 17.01.2025 2025 19.01.2025 ›

Photosphere sunspot drawing and RDS evaluation

18.01.2025 photosphere drawing

High-resolution scan (3230 px)

Time
10:50 UT
Observer
Süleyman FİŞEK
g
9
f
72
R
162
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HS_ – 1Group 1 · HS_ – 1 Group 2 · EHC – 13Group 2 · EHC – 13 Group 3 · CKI – 16Group 3 · CKI – 16 Group 4 · AX_ – 1Group 4 · AX_ – 1 Group 5 · AX_ – 2Group 5 · AX_ – 2 Group 6 · CSO – 5Group 6 · CSO – 5 Group 7 · DHO – 3Group 7 · DHO – 3 Group 8 · FKC – 28Group 8 · FKC – 28
RDS data file (.gzd) 
[Gözlem]
Tarih=18.01.2025
Saat=10:50
Gözlemci=Süleyman FİŞEK
KontrolEden=Süleyman FİŞEK
Durumaçısı=-6.36
Enlemaçısı=-4.89
Boylamaçısı=206.89
Boylamfark=1
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.6
Sırano=20175
AyRasatNo=11
RasatÖnceki=17.01.2025
RasatSonraki=19.01.2025

[Leke Grupları]
Grupsayısı=9:7:2
LekeSayısı=72:41:31
RölatifSayı=162:111:51
01=HS_ 01 +03.944 +76.430 282.933 -1.000 0000 0 +04.396 +77.206 +03.493 +74.880
02=EHC 13 +06.851 +39.643 246.533 +0.000 0000 0 +08.648 +45.577 +05.550 +33.710 +06.851 +45.377 +06.851 +33.910
03=CKI 16 +18.286 -07.351 199.539 +0.000 0000 0 +21.281 -00.169 +15.291 -14.533 +18.286 -00.369 +18.286 -14.333
04=AX_ 01 +19.554 -22.417 184.473 -1.000 0000 0 +19.554 -22.417 +19.554 -22.417
05=AX_ 02 +10.136 -30.704 176.186 +0.000 0000 0 +12.537 -29.502 +07.735 -31.907 +00.000 +00.000 +00.000 +00.000
06=CSO 05 +18.750 -36.257 170.633 11.205 0000 0 +20.690 -31.404 +16.810 -41.110 +17.880 -33.409 +18.220 -39.133
07=DHO 03 +14.236 -47.247 159.643 +0.000 0000 0 +15.918 -44.948 +12.555 -49.546 +14.236 -45.148 +14.236 -49.346
08=FKC 28 -07.495 -24.972 181.918 +0.000 0000 0 -03.440 -16.996 -11.551 -32.948 -07.495 -17.196 -07.495 -32.748
09=DSI 03 -16.204 -63.716 143.174 +0.000 0000 0 -14.855 -66.682 -17.553 -60.750 -16.204 -60.950 -16.204 -66.482
20250118.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 →

2025/20250118_sf · SF · 6 frames · 128.6 MB · 11:14:40–11:20:40 UT

11:20:40 UT · 60 ms 11:18:08 UT · 60 ms 11:14:40 UT · 30 ms 11:19:48 UT · 30 ms 11:17:24 UT · 30 ms 11:15:34 UT · 60 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.