Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 11 March 2026

‹ 10.03.2026 2026 17.03.2026 ›

Photosphere sunspot drawing and RDS evaluation

11.03.2026 photosphere drawing

High-resolution scan (3231 px)

Time
08:20 UT
Observer
Yağız ALTIKULAÇ
g
9
f
17
R
107
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CSO – 2Group 1 · CSO – 2 Group 2 · BXO – 2Group 2 · BXO – 2 Group 3 · HH_ – 2Group 3 · HH_ – 2 Group 4 · CAO – 3Group 4 · CAO – 3 Group 5 · AX_ – 1Group 5 · AX_ – 1 Group 6 · HR_ – 1Group 6 · HR_ – 1 Group 7 · AX_ – 1Group 7 · AX_ – 1 Group 8 · HA_ – 1Group 8 · HA_ – 1 Group 9 · CRI – 4Group 9 · CRI – 4
RDS data file (.gzd) 
[Gözlem]
Tarih=11.03.2026
Saat=08:20
Gözlemci=Yağız ALTIKULAÇ
KontrolEden=Emre YILMAN
Durumaçısı=-23.76
Enlemaçısı=-7.23
Boylamaçısı=105.89
Boylamfark=2
GKalite=3
GDurum=H.S , K.T
Kuzeyaçısı=-0.5
Sırano=20434
AyRasatNo=8
RasatÖnceki=09.03.2026
RasatSonraki=17.03.2026

[Leke Grupları]
Grupsayısı=9:8:1
LekeSayısı=17:13:4
RölatifSayı=107:93:14
01=CSO 02 +07.894 +71.754 177.644 +0.000 0000 0 +09.785 +74.786 +06.300 +68.722 +07.894 +74.586 +07.894 +68.922
02=BXO 02 +14.284 +60.230 166.120 +0.000 0000 0 +14.611 +62.865 +13.958 +57.595 +14.284 +62.365 +14.284 +58.950
03=HH_ 02 +07.546 +46.699 152.589 +0.000 0000 0 +09.584 +48.700 +05.507 +44.697 +07.546 +48.201 +07.546 +45.198
04=CAO 03 +25.715 -24.186 081.704 +0.000 0000 0 +27.980 -22.135 +24.331 -26.238 +25.715 -22.335 +25.715 -26.380
05=AX_ 01 +07.800 -32.252 073.638 +0.000 0000 0 +08.150 -32.170 +07.449 -32.487 +07.800 -32.593 +07.800 -31.910
06=HR_ 01 +06.181 -42.492 063.398 +0.000 0000 0 +06.750 -42.126 +05.613 -42.858 +06.181 -42.626 +06.181 -42.358
07=AX_ 01 +12.490 -48.930 057.797 +0.000 0000 0 +12.761 -47.863 +12.219 -48.323 +12.490 -49.200 +12.490 -48.660
08=HA_ 01 +13.810 -60.788 045.102 +0.000 0000 0 +13.585 -60.296 +12.577 -61.280 +13.810 -60.796 +13.810 -60.780
09=CRI 04 -14.854 +35.820 141.710 +0.000 0000 0 -13.524 +38.247 -16.185 +33.393 -14.854 +38.470 -14.854 +33.593
20260311.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 →

2026/20260311 · · 8 frames · 171.4 MB · 09:12:30–09:20:57 UT

09:12:30 UT · 30 ms 09:18:09 UT · 30 ms 09:14:38 UT · 40 ms · over-exposed 09:19:11 UT · 40 ms · over-exposed 09:19:49 UT · 50 ms · over-exposed 09:16:01 UT · 50 ms · over-exposed 09:20:57 UT · 60 ms · over-exposed 09:17:26 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.