Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Friday, 17 January 2025

‹ 10.01.2025 2025 18.01.2025 ›

Photosphere sunspot drawing and RDS evaluation

17.01.2025 photosphere drawing

High-resolution scan (3230 px)

Time
08:15 UT
Observer
Ergün EGE
g
8
f
43
R
123
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · AX_ – 2Group 1 · AX_ – 2 Group 2 · DSC – 12Group 2 · DSC – 12 Group 3 · CKO – 5Group 3 · CKO – 5 Group 4 · AX_ – 2Group 4 · AX_ – 2 Group 5 · DSO – 5Group 5 · DSO – 5 Group 6 · HA_ – 1Group 6 · HA_ – 1 Group 7 · DKC – 15Group 7 · DKC – 15 Group 8 · AX_ – 1Group 8 · AX_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=17.01.2025
Saat=08:15
Gözlemci=Ergün EGE
KontrolEden=Süleyman FİŞEK
Durumaçısı=-5.85
Enlemaçısı=-4.78
Boylamaçısı=221.47
Boylamfark=2
GKalite=3
GDurum=B.A
Kuzeyaçısı=-0.4
Sırano=20174
AyRasatNo=10
RasatÖnceki=10.01.2025
RasatSonraki=18.01.2025

[Leke Grupları]
Grupsayısı=8:6:2
LekeSayısı=43:27:16
RölatifSayı=123:87:36
01=AX_ 02 +03.536 +60.104 281.574 +0.000 0000 0 +04.218 +60.863 +02.854 +59.345 +03.536 +60.363 +03.536 +59.845
02=DSC 12 +06.460 +25.537 247.700 +0.000 0000 0 +08.662 +29.983 +04.258 +21.910 +06.460 +29.783 +06.460 +21.291
03=CKO 05 +17.493 -16.551 204.919 +0.000 0000 0 +19.754 -13.181 +15.232 -19.921 +17.493 -13.381 +17.493 -19.721
04=AX_ 02 +17.430 -26.560 194.910 +0.000 0000 0 +17.328 -26.930 +16.758 -27.270 +17.430 -26.890 +17.430 -26.230
05=DSO 05 +17.402 -49.640 171.830 +0.000 0000 0 +19.164 -44.959 +15.639 -54.321 +17.402 -45.159 +17.402 -54.121
06=HA_ 01 +14.254 -60.378 161.920 +0.000 0000 0 +15.113 -59.379 +13.395 -61.377 +14.254 -59.879 +14.254 -60.877
07=DKC 15 -09.611 -42.265 179.205 +0.000 0000 0 -06.494 -36.194 -12.727 -48.336 -09.611 -36.394 -09.611 -48.136
08=AX_ 01 -17.978 -82.415 139.550 +0.000 0000 0 -17.762 -82.900 -18.194 -82.740 -17.978 -82.835 -17.978 -81.995
20250117.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 →

2025/20250117_ee · EE · 8 frames · 171.4 MB · 08:28:32–08:37:42 UT

08:35:52 UT · 30 ms 08:37:08 UT · 50 ms 08:36:33 UT · 40 ms 08:37:42 UT · 60 ms · over-exposed 08:34:13 UT · 50 ms · over-exposed 08:35:16 UT · 60 ms · over-exposed 08:28:32 UT · 30 ms 08:29:58 UT · 40 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.