Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Sunday, 21 April 2024

‹ 18.04.2024 2024 22.04.2024 ›

Photosphere sunspot drawing and RDS evaluation

21.04.2024 photosphere drawing

High-resolution scan (3230 px)

Time
07:10 UT
Observer
Ergün EGE
g
13
f
88
R
218
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · EAC – 13Group 1 · EAC – 13 Group 2 · AX_ – 1Group 2 · AX_ – 1 Group 3 · HA_ – 1Group 3 · HA_ – 1 Group 4 · HA_ – 2Group 4 · HA_ – 2 Group 5 · AX_ – 2Group 5 · AX_ – 2 Group 6 · BXI – 6Group 6 · BXI – 6 Group 7 · AX_ – 1Group 7 · AX_ – 1 Group 8 · BXI – 10Group 8 · BXI – 10 Group 9 · EKI – 19Group 9 · EKI – 19 Group 10 · CAI – 17Group 10 · CAI – 17 Group 11 · BXI – 7Group 11 · BXI – 7 Group 12 · CSI – 8Group 12 · CSI – 8 Group 13 · AX_ – 1Group 13 · AX_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=21.04.2024
Saat=07:10
Gözlemci=Ergün EGE
KontrolEden=Korhan YELKENCİ
Durumaçısı=-25.44
Enlemaçısı=-5.07
Boylamaçısı=200.76
Boylamfark=3
GKalite=3
GDurum=B.A
Kuzeyaçısı=-0.1
Sırano=19965
AyRasatNo=18
RasatÖnceki=18.04.2024
RasatSonraki=22.04.2024

[Leke Grupları]
Grupsayısı=13:6:7
LekeSayısı=88:25:63
RölatifSayı=218:85:133
01=EAC 13 +27.536 +17.449 218.209 +0.000 0000 0 +30.375 +23.509 +24.696 +11.390 +27.536 +23.309 +27.536 +11.590
02=AX_ 01 +16.902 -08.624 192.136 +0.000 0000 0 +17.257 -08.332 +16.547 -08.916 +16.902 -08.832 +16.902 -08.416
03=HA_ 01 +10.867 -16.707 184.530 +0.000 0000 0 +11.759 -16.106 +09.976 -17.308 +10.867 -16.606 +10.867 -16.808
04=HA_ 02 +13.452 -22.180 178.742 +0.000 0000 0 +14.182 -21.325 +12.722 -22.712 +13.452 -21.986 +13.452 -22.374
05=AX_ 02 +20.626 -23.455 177.305 +0.000 0000 0 +21.103 -22.737 +20.148 -24.174 +20.626 -23.236 +20.626 -23.674
06=BXI 06 +14.301 -40.670 160.693 +0.000 0000 0 +15.320 -37.523 +13.281 -42.610 +14.301 -37.723 +14.301 -42.410
07=AX_ 01 -21.194 +46.428 247.188 +0.000 0000 0 -20.795 +46.801 -21.594 +46.550 -21.194 +46.540 -21.194 +46.803
08=BXI 10 -17.810 +25.264 226.240 +0.000 0000 0 -16.467 +28.287 -19.153 +22.240 -17.810 +28.870 -17.810 +22.440
09=EKI 19 -08.430 +22.824 223.584 +0.000 0000 0 -06.354 +28.360 -10.507 +17.288 -08.430 +28.160 -08.430 +17.488
10=CAI 17 -13.485 +17.639 218.399 +0.000 0000 0 -11.193 +21.740 -15.778 +14.205 -13.485 +20.874 -13.485 +14.405
11=BXI 07 -14.320 +08.960 208.856 +0.000 0000 0 -11.473 +12.607 -17.168 +03.586 -14.320 +12.407 -14.320 +03.786
12=CSI 08 -12.900 -03.168 197.592 +0.000 0000 0 -10.132 +00.753 -13.885 -07.880 -12.900 +00.553 -12.900 -06.888
13=AX_ 01 -09.133 -69.140 131.746 +0.000 0000 0 -08.911 -68.540 -09.354 -69.487 -09.133 -69.166 -09.133 -69.114
20240421.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 →

2024/20240421_ee · EE · 7 frames · 150.0 MB · 07:26:50–07:32:59 UT

07:28:09 UT · 40 ms 07:26:50 UT · 30 ms 07:32:08 UT · 30 ms 07:28:45 UT · 50 ms 07:32:59 UT · 40 ms 07:29:52 UT · 60 ms · over-exposed 07:31:18 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.