Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Tuesday, 13 May 2025

‹ 12.05.2025 2025 14.05.2025 ›

Photosphere sunspot drawing and RDS evaluation

13.05.2025 photosphere drawing

High-resolution scan (3214 px)

Time
11:45 UT
Observer
Olcay PLEVNE
g
5
f
8
R
58
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · BXI – 2Group 1 · BXI – 2 Group 2 · AX_ – 2Group 2 · AX_ – 2 Group 3 · AX_ – 1Group 3 · AX_ – 1 Group 4 · HS_ – 2Group 4 · HS_ – 2 Group 5 · HS_ – 1Group 5 · HS_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=13.05.2025
Saat=11:45
Gözlemci=Olcay PLEVNE
KontrolEden=Burçin TANIK
Durumaçısı=-21.31
Enlemaçısı=-2.84
Boylamaçısı=129.9
Boylamfark=0
GKalite=3
GDurum=K.T
Kuzeyaçısı=0.0
Sırano=20243
AyRasatNo=9
RasatÖnceki=12.05.2025
RasatSonraki=14.05.2025

[Leke Grupları]
Grupsayısı=5:4:1
LekeSayısı=8:7:1
RölatifSayı=58:47:11
01=BXI 02 +08.720 +71.938 201.838 +0.000 0000 0 +09.247 +73.829 +06.898 +70.470 +08.720 +73.629 +08.720 +70.247
02=AX_ 02 +02.294 +09.402 139.302 +0.000 0000 0 +02.957 +09.973 +01.630 +08.831 +02.294 +09.473 +02.294 +09.331
03=AX_ 01 +04.295 -01.250 128.875 -1.000 0000 0 +04.295 -01.250 +04.295 -01.250
04=HS_ 02 +15.298 -73.484 056.416 +0.000 0000 0 +17.493 -68.180 +13.104 -78.949 +15.298 -68.600 +15.298 -78.368
05=HS_ 01 -09.542 +54.641 184.541 +0.000 0000 0 -08.579 +56.500 -10.505 +53.232 -09.542 +55.775 -09.542 +53.507
20250513.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 →

2025/20250513_op · OP · 4 frames · 85.7 MB · 11:45:04–11:49:53 UT

11:46:37 UT · 40 ms 11:45:04 UT · 40 ms 11:49:04 UT · 60 ms · over-exposed 11:49:53 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.