Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 4 June 2025

‹ 03.06.2025 2025 05.06.2025 ›

Photosphere sunspot drawing and RDS evaluation

04.06.2025 photosphere drawing

High-resolution scan (3219 px)

Time
10:50 UT
Observer
Burçin TANIK
g
6
f
37
R
97
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · AX_ – 1Group 1 · AX_ – 1 Group 2 · DKC – 14Group 2 · DKC – 14 Group 3 · HA_ – 1Group 3 · HA_ – 1 Group 4 · CAO – 5Group 4 · CAO – 5 Group 5 · CHO – 7Group 5 · CHO – 7
RDS data file (.gzd) 
[Gözlem]
Tarih=4.06.2025
Saat=10:50
Gözlemci=Burçin TANIK
KontrolEden=Burçin TANIK
Durumaçısı=-14.03
Enlemaçısı=-0.26
Boylamaçısı=199.35
Boylamfark=1
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.4
Sırano=20261
AyRasatNo=4
RasatÖnceki=03.06.2025
RasatSonraki=05.06.2025

[Leke Grupları]
Grupsayısı=6:4:2
LekeSayısı=37:21:16
RölatifSayı=97:61:36
01=AX_ 01 +03.939 +62.383 261.733 -1.000 0000 0 +03.939 +62.383 +03.939 +62.383
02=DKC 14 +10.607 +44.896 244.246 27.402 0000 0 +13.492 +49.432 +07.722 +40.360 +08.984 +47.907 +12.415 +41.265
03=HA_ 01 +10.941 +37.683 237.330 -1.000 0000 0 +11.610 +38.342 +10.273 +37.250
04=CAO 05 +12.440 -20.781 178.569 +0.000 0000 0 +13.259 -18.720 +11.622 -23.490 +12.440 -18.272 +12.440 -23.290
05=CHO 07 -12.742 +53.386 252.736 58.586 0000 0 -10.643 +55.316 -14.841 +51.456 -12.637 +53.700 -14.840 +52.816
06=DKO 09 -13.808 -69.254 130.960 +0.000 0000 0 -12.267 -64.743 -15.349 -73.764 -13.808 -64.943 -13.808 -73.564
20250604.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 →

2025/20250604_bto · BTO · 3 frames · 64.3 MB · 10:52:44–10:56:03 UT

10:54:33 UT · 20 ms 10:52:44 UT · 60 ms · over-exposed 10:56:03 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.