Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Saturday, 15 March 2025

‹ 14.03.2025 2025 17.03.2025 ›

Photosphere sunspot drawing and RDS evaluation

15.03.2025 photosphere drawing

High-resolution scan (3224 px)

Time
09:35 UT
Observer
Burçin TANIK
g
10
f
62
R
162
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · CAI – 20Group 1 · CAI – 20 Group 2 · HS_ – 1Group 2 · HS_ – 1 Group 3 · DAC – 18Group 3 · DAC – 18 Group 4 · CAO – 10Group 4 · CAO – 10 Group 5 · HA_ – 3Group 5 · HA_ – 3 Group 6 · HS_ – 1Group 6 · HS_ – 1 Group 7 · HS_ – 1Group 7 · HS_ – 1 Group 8 · BXO – 2Group 8 · BXO – 2 Group 9 · DAO – 5Group 9 · DAO – 5
RDS data file (.gzd) 
[Gözlem]
Tarih=15.03.2025
Saat=09:35
Gözlemci=Burçin TANIK
KontrolEden=Korhan YELKENCİ
Durumaçısı=-24.49
Enlemaçısı=-7.16
Boylamaçısı=190.05
Boylamfark=1
GKalite=3
GDurum=G.T , H.S
Kuzeyaçısı=-0.4
Sırano=20208
AyRasatNo=12
RasatÖnceki=14.03.2025
RasatSonraki=17.03.2025

[Leke Grupları]
Grupsayısı=10:5:5
LekeSayısı=62:52:10
RölatifSayı=162:102:60
01=CAI 20 +05.728 +25.314 215.364 47.138 0000 0 +09.640 +28.490 +02.392 +22.138 +07.413 +26.741 +03.498 +23.990
02=HS_ 01 +18.471 +04.852 194.902 -1.000 0000 0 +19.103 +05.783 +17.838 +03.921
03=DAC 18 +04.557 +00.427 190.477 +0.000 0000 0 +06.460 +03.714 +03.680 -02.860 +04.557 +03.514 +04.557 -02.660
04=CAO 10 +10.136 -12.388 177.662 08.364 0000 0 +11.277 -09.225 +08.995 -15.551 +09.754 -09.866 +10.463 -14.699
05=HA_ 03 +23.734 -15.860 174.190 -1.000 0000 0 +24.448 -15.100 +23.210 -16.709
06=HS_ 01 -20.317 +42.116 232.166 -1.000 0000 0 -19.275 +43.135 -21.359 +41.960
07=HS_ 01 -05.947 -13.550 176.995 -1.000 0000 0 -04.814 -11.863 -07.800 -14.247
08=BXO 02 -14.533 -44.981 145.690 -1.000 0000 0 -14.890 -42.670 -14.977 -47.293
09=DAO 05 -18.577 -52.238 137.812 35.901 0000 0 -16.729 -48.905 -20.425 -55.570 -17.787 -51.491 -19.759 -54.218
10=HS_ 01 -17.540 -62.186 127.864 -1.000 0000 0 -16.138 -61.238 -17.970 -63.133
20250315.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 →

2025/20250315_bto · BTO · 4 frames · 85.7 MB · 09:43:18–09:48:16 UT

09:48:16 UT · 20 ms 09:45:29 UT · 30 ms 09:46:54 UT · 70 ms · over-exposed 09:43:18 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.