Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Thursday, 19 June 2025

‹ 18.06.2025 2025 20.06.2025 ›

Photosphere sunspot drawing and RDS evaluation

19.06.2025 photosphere drawing

High-resolution scan (3230 px)

Time
07:25 UT
Observer
Korhan YELKENCİ
g
7
f
60
R
130
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · HS_ – 2Group 1 · HS_ – 2 Group 2 · EHC – 41Group 2 · EHC – 41 Group 3 · DSO – 6Group 3 · DSO – 6 Group 4 · HS_ – 1Group 4 · HS_ – 1 Group 5 · DKO – 7Group 5 · DKO – 7
RDS data file (.gzd) 
[Gözlem]
Tarih=19.06.2025
Saat=07:25
Gözlemci=Korhan YELKENCİ
KontrolEden=Ergün EGE
Durumaçısı=-7.84
Enlemaçısı=1.52
Boylamaçısı=2.69
Boylamfark=3
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.4
Sırano=20275
AyRasatNo=18
RasatÖnceki=18.06.2025
RasatSonraki=20.06.2025

[Leke Grupları]
Grupsayısı=7:3:4
LekeSayısı=60:49:11
RölatifSayı=130:79:51
01=HS_ 02 +14.341 +55.770 057.767 -1.000 0000 0 +15.110 +55.634 +13.670 +54.520
02=EHC 41 +17.836 +29.287 031.977 18.903 0000 0 +20.976 +36.540 +14.697 +22.520 +15.741 +33.960 +18.995 +24.406
03=DSO 06 +20.803 +15.980 017.788 16.700 0000 0 +23.297 +21.559 +18.309 +08.638 +19.572 +19.176 +22.106 +10.339
04=HS_ 01 -12.330 +33.970 035.787 -1.000 0000 0 -11.333 +33.994 -12.733 +32.201
05=DKO 07 -14.580 -60.620 302.628 +0.000 0000 0 -12.141 -55.217 -15.976 -64.907 -14.580 -55.417 -14.580 -64.707
06=HR_ 01 -10.703 -61.687 301.300 -1.000 0000 0 -10.223 -60.903 -11.184 -62.471
07=?__ 02 -12.669 -70.860 291.830 -1.000 0000 0 -11.388 -69.292 -13.950 -72.427
20250619.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 →

2025/20250619_ky · KY · 14 frames · 299.9 MB · 07:47:53–07:55:20 UT

07:52:44 UT · 30 ms 07:50:40 UT · 30 ms 07:47:53 UT · 30 ms 07:53:48 UT · 30 ms 07:54:20 UT · 60 ms · over-exposed 07:51:12 UT · 60 ms · over-exposed 07:53:16 UT · 60 ms · over-exposed 07:48:25 UT · 60 ms · over-exposed 07:55:20 UT · 60 ms 07:54:50 UT · 30 ms 07:52:12 UT · 60 ms 07:51:42 UT · 30 ms 07:49:25 UT · 60 ms 07:48:55 UT · 30 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.