Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Friday, 4 April 2025

‹ 03.04.2025 2025 06.04.2025 ›

Photosphere sunspot drawing and RDS evaluation

04.04.2025 photosphere drawing

High-resolution scan (3230 px)

Time
06:50 UT
Observer
Ergün EGE
g
9
f
50
R
140
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · DRO – 4Group 1 · DRO – 4 Group 2 · DSI – 7Group 2 · DSI – 7 Group 3 · BXO – 4Group 3 · BXO – 4 Group 4 · HH_ – 1Group 4 · HH_ – 1 Group 5 · AX_ – 1Group 5 · AX_ – 1 Group 6 · AX_ – 3Group 6 · AX_ – 3 Group 7 · DRI – 6Group 7 · DRI – 6 Group 8 · AX_ – 2Group 8 · AX_ – 2 Group 9 · FKC – 22Group 9 · FKC – 22
RDS data file (.gzd) 
[Gözlem]
Tarih=4.04.2025
Saat=06:50
Gözlemci=Ergün EGE
KontrolEden=Burçin TANIK
Durumaçısı=-26.24
Enlemaçısı=-6.36
Boylamaçısı=287.82
Boylamfark=3
GKalite=3
GDurum=H.S
Kuzeyaçısı=-0.5
Sırano=20218
AyRasatNo=2
RasatÖnceki=03.04.2025
RasatSonraki=06.04.2025

[Leke Grupları]
Grupsayısı=9:4:5
LekeSayısı=50:16:34
RölatifSayı=140:56:84
01=DRO 04 +14.321 +72.633 000.453 +0.000 0000 0 +15.507 +79.870 +13.135 +66.180 +14.321 +78.887 +14.321 +66.380
02=DSI 07 +19.171 +46.583 334.403 +0.000 0000 0 +20.645 +50.204 +17.697 +42.962 +19.171 +50.400 +19.171 +43.162
03=BXO 04 +26.172 +15.360 303.180 +0.000 0000 0 +27.900 +17.130 +25.254 +13.707 +26.172 +16.813 +26.172 +13.907
04=HH_ 01 +05.106 +12.259 300.790 +0.000 0000 0 +06.926 +13.865 +03.286 +10.653 +05.106 +13.365 +05.106 +11.153
05=AX_ 01 -09.333 +44.788 332.608 +0.000 0000 0 -09.480 +45.409 -09.618 +44.168 -09.333 +44.908 -09.333 +44.667
06=AX_ 03 -15.687 +18.890 306.710 +0.000 0000 0 -14.113 +20.470 -17.261 +17.734 +00.000 +00.000 +00.000 +00.000
07=DRI 06 -30.511 +14.670 302.490 +0.000 0000 0 -29.604 +19.335 -31.419 +10.400 -30.511 +19.135 -30.511 +10.204
08=AX_ 02 -09.878 +07.125 294.945 +0.000 0000 0 -09.445 +08.980 -10.311 +06.152 -09.878 +08.390 -09.878 +06.211
09=FKC 22 -16.590 -10.690 277.751 +0.000 0000 0 -13.300 -01.366 -19.880 -18.772 -16.590 -01.566 -16.590 -18.572
20250404.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 →

2025/20250404_ee · EE · 3 frames · 64.3 MB · 06:53:37–06:56:40 UT

06:55:01 UT · 30 ms 06:53:37 UT · 30 ms 06:56:40 UT · 40 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.