Images 16.06.2025 · Istanbul University Observatory Solar Observations

Photosphere sunspot drawing and RDS evaluation

High-resolution scan (3230 px)

Time: 06:40 UT
Observer: Korhan YELKENCİ
g: 5
f: 44
R: 94
Seeing: 3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CAI – 4

Group 2 · CAI – 7

Group 3 · HS_ – 2

Group 4 · EHC – 27

Group 5 · DAI – 4

Group 6

RDS data file (.gzd)

[Gözlem]
Tarih=16.06.2025
Saat=06:40
Gözlemci=Korhan YELKENCİ
KontrolEden=Olcay PLEVNE
Durumaçısı=-9.15
Enlemaçısı=1.16
Boylamaçısı=42.81
Boylamfark=3
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.5
Sırano=20272
AyRasatNo=15
RasatÖnceki=15.06.2025
RasatSonraki=17.06.2025

[Leke Grupları]
Grupsayısı=5:4:1
LekeSayısı=44:40:4
RölatifSayı=94:80:14
01=CAI 04 +06.157 +76.630 118.873 17.629 0000 0 +07.672 +80.274 +04.642 +71.852 +07.263 +80.290 +04.842 +72.384
02=CAI 07 +13.869 +13.643 056.453 26.423 0000 0 +15.293 +16.182 +12.445 +11.104 +14.902 +15.854 +12.645 +11.304
03=HS_ 02 +09.338 -03.587 039.223 -1.000 0000 0 +10.490 -03.870 +08.626 -04.860
04=EHC 27 +18.108 -10.941 031.869 23.743 0000 0 +22.205 -05.571 +14.100 -16.312 +15.192 -07.972 +18.395 -15.280
05=DAI 04 -11.983 -10.710 032.739 10.294 0000 0 -11.110 -05.604 -12.955 -14.538 -11.211 -05.804 -12.755 -14.338

20250616.gzd

Chromosphere (H-α) FITS frames

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 →

2025/20250616_ky · KY · 20 frames · 428.5 MB · 07:00:55–07:12:40 UT