Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Thursday, 3 July 2025

‹ 02.07.2025 2025 04.07.2025 ›

Photosphere sunspot drawing and RDS evaluation

03.07.2025 photosphere drawing

High-resolution scan (3230 px)

Time
08:35 UT
Observer
Süleyman FİŞEK
g
8
f
42
R
122
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CHO – 4Group 1 · CHO – 4 Group 2 · HA_ – 2Group 2 · HA_ – 2 Group 3 · HS_ – 1Group 3 · HS_ – 1 Group 4 · DSI – 8Group 4 · DSI – 8 Group 5 · CRO – 2Group 5 · CRO – 2 Group 6 · DAI – 19Group 6 · DAI – 19 Group 7 · CSO – 2Group 7 · CSO – 2 Group 8 · AX_ – 4Group 8 · AX_ – 4
RDS data file (.gzd) 
[Gözlem]
Tarih=3.07.2025
Saat=08:35
Gözlemci=Süleyman FİŞEK
KontrolEden=Korhan YELKENCİ
Durumaçısı=-1.53
Enlemaçısı=3.12
Boylamaçısı=176.74
Boylamfark=2
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.7
Sırano=20289
AyRasatNo=3
RasatÖnceki=02.07.2025
RasatSonraki=04.07.2025

[Leke Grupları]
Grupsayısı=8:4:4
LekeSayısı=42:15:27
RölatifSayı=122:55:67
01=CHO 04 +13.457 +39.757 216.497 +0.000 0000 0 +15.953 +43.939 +10.960 +35.574 +13.457 +43.739 +13.457 +35.774
02=HA_ 02 +07.467 +33.861 210.601 +0.000 0000 0 +08.210 +34.412 +06.913 +33.309 +07.467 +33.912 +07.467 +33.810
03=HS_ 01 +21.382 -04.979 171.761 +0.000 0000 0 +22.204 -04.134 +20.560 -05.823 +21.382 -04.635 +21.382 -05.324
04=DSI 08 +02.749 -08.588 168.152 +0.000 0000 0 +03.991 -11.536 +01.506 -05.640 +02.749 -05.840 +02.749 -11.336
05=CRO 02 -27.678 +53.388 230.128 +0.000 0000 0 -26.928 +55.620 -28.428 +51.714 -27.678 +54.841 -27.678 +51.935
06=DAI 19 -18.234 +09.362 186.102 +0.000 0000 0 -16.554 +04.887 -19.913 +13.836 -18.234 +13.636 -18.234 +05.870
07=CSO 02 -04.555 +03.312 180.520 +0.000 0000 0 -03.942 -01.487 -05.167 +08.112 -04.555 +07.611 -04.555 -00.987
08=AX_ 04 -17.112 -37.846 138.894 +0.000 0000 0 -16.230 -38.959 -18.202 -36.733 +00.000 +00.000 +00.000 +00.000
20250703.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 →

2025/20250703_sf · SF · 7 frames · 150.0 MB · 08:44:20–08:48:18 UT

08:46:18 UT 08:45:19 UT · 3 ms 08:48:18 UT · 3 ms 08:47:18 UT · 3 ms 08:44:20 UT · 6 ms 08:46:48 UT · 6 ms 08:47:48 UT · 6 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.