Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Wednesday, 2 July 2025

‹ 01.07.2025 2025 03.07.2025 ›

Photosphere sunspot drawing and RDS evaluation

02.07.2025 photosphere drawing

High-resolution scan (3230 px)

Time
12:00 UT
Observer
Burçin TANIK
g
8
f
27
R
107
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · AX_ – 3Group 1 · AX_ – 3 Group 2 · CSO – 5Group 2 · CSO – 5 Group 3 · HR_ – 1Group 3 · HR_ – 1 Group 4 · HS_ – 1Group 4 · HS_ – 1 Group 5 · BXI – 6Group 5 · BXI – 6 Group 6 · CAO – 4Group 6 · CAO – 4 Group 7 · DAO – 6Group 7 · DAO – 6 Group 8 · HS_ – 1Group 8 · HS_ – 1
RDS data file (.gzd) 
[Gözlem]
Tarih=2.07.2025
Saat=12:00
Gözlemci=Burçin TANIK
KontrolEden=Süleyman FİŞEK
Durumaçısı=-1.92
Enlemaçısı=3.03
Boylamaçısı=188.09
Boylamfark=0
GKalite=3
GDurum=G.T
Kuzeyaçısı=-1.1
Sırano=20288
AyRasatNo=2
RasatÖnceki=01.07.2025
RasatSonraki=03.07.2025

[Leke Grupları]
Grupsayısı=8:5:3
LekeSayısı=27:16:11
RölatifSayı=107:66:41
01=AX_ 03 +08.110 +71.306 259.396 +0.000 0000 0 +08.679 +72.633 +07.542 +69.979 +08.110 +72.133 +08.110 +70.479
02=CSO 05 +13.496 +28.572 216.662 16.609 0000 0 +15.415 +33.330 +11.577 +24.111 +12.216 +32.240 +14.470 +24.440
03=HR_ 01 +07.656 +22.766 210.856 +0.000 0000 0 +08.470 +23.211 +07.264 +22.321 +07.656 +22.711 +07.656 +22.821
04=HS_ 01 +21.593 -15.399 172.691 +0.000 0000 0 +22.337 -14.385 +20.849 -16.413 +21.593 -14.885 +21.593 -15.913
05=BXI 06 +02.705 -18.412 169.678 +0.000 0000 0 +03.997 -16.750 +01.414 -20.748 +02.705 -16.275 +02.705 -20.548
06=CAO 04 -26.951 +42.290 230.119 +0.000 0000 0 -26.590 +44.190 -27.843 +39.868 -26.951 +43.990 -26.951 +40.680
07=DAO 06 -17.311 -00.720 187.370 +0.000 0000 0 -16.331 +03.460 -18.291 -04.486 -17.311 +02.846 -17.311 -04.286
08=HS_ 01 -04.533 -10.760 177.330 +0.000 0000 0 -03.958 -10.900 -05.107 -11.511 -04.533 -10.955 -04.533 -10.566
20250702.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 →

2025/20250702_btö · BTÖ · 2 frames · 42.9 MB · 12:00:40–12:02:23 UT

12:00:40 UT · 30 ms 12:02:23 UT · 70 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.