Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Sunday, 4 May 2025

‹ 03.05.2025 2025 05.05.2025 ›

Photosphere sunspot drawing and RDS evaluation

04.05.2025 photosphere drawing

High-resolution scan (3224 px)

Time
11:50 UT
Observer
Burçin TANIK
g
4
f
52
R
92
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HA_ – 2Group 1 · HA_ – 2 Group 2 · EKC – 41Group 2 · EKC – 41 Group 3 · CAI – 6Group 3 · CAI – 6 Group 4 · ?__ – 3Group 4 · ?__ – 3
RDS data file (.gzd) 
[Gözlem]
Tarih=4.05.2025
Saat=11:50
Gözlemci=Burçin TANIK
KontrolEden=Süleyman FİŞEK
Durumaçısı=-23.41
Enlemaçısı=-3.82
Boylamaçısı=248.85
Boylamfark=0
GKalite=3
GDurum=G.T
Kuzeyaçısı=0.0
Sırano=20236
AyRasatNo=2
RasatÖnceki=03.05.2025
RasatSonraki=05.05.2025

[Leke Grupları]
Grupsayısı=4:3:1
LekeSayısı=52:49:3
RölatifSayı=92:79:13
01=HA_ 02 +05.176 +54.529 303.379 +0.000 0000 0 +05.974 +55.334 +04.377 +53.725 +05.176 +54.833 +05.176 +54.224
02=EKC 41 +07.910 -09.626 239.224 25.170 0000 0 +12.114 -03.330 +03.706 -15.923 +05.983 -06.291 +09.453 -13.705
03=CAI 06 +06.774 -37.675 211.175 +0.000 0000 0 +07.710 -35.160 +05.838 -40.334 +06.774 -35.216 +06.774 -40.134
04=?__ 03 -10.504 -67.273 181.577 +0.000 0000 0 -08.795 -64.218 -12.213 -70.327 -10.504 -64.719 -10.504 -69.827
20250504.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 →

2025/20250504_bto · BTO · 3 frames · 64.3 MB · 11:51:27–11:53:50 UT

11:52:39 UT · 20 ms 11:53:50 UT · 40 ms · over-exposed 11:51:27 UT · 50 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.