Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Monthly Sunspot Classification and Coordinates

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June 2025 Monthly report →

Each group: class – number of spots (B, ΔL). NS: No sunspot.

DrawingDayRClassification and Coordinates
01 115 HS_ – 1 (7, 66.9W), CAO – 7 (4, 19.9W), EKC – 31 (10, 05.8W), DAO – 6 (5, 23.5E), DKI – 20 (-14, 15.2W)
02 107 HS_ – 1 (6, 76.5W), AX_ – 3 (3, 36.5W), EAC – 35 (10, 18.6W), CAI – 4 (5, 10.2E), CAI – 14 (-13, 28.2W)
03 71 HS_ – 1 (3, 51.3W), DAI – 12 (10, 31.3W), HR_ – 1 (6, 04.8W), CAO – 4 (-13, 41.7W), AX_ – 3 (-14, 77.7E)
04 87 AX_ – 1 (4, 62.4W), EAC – 15 (10, 43.7W), CAO – 5 (12, 20.8E), CHO – 7 (-13, 53.4W), DKO – 9 (-14, 69.3E)
05 86 CAI – 14 (10, 54.5W), BXI – 13 (12, 09.3E), HS_ – 1 (-13, 63.9W), CAI – 18 (-15, 60.5E)
06 86 CAI – 6 (9, 69.8W), CRI – 5 (13, 05.8W), AX_ – 1 (11, 13.9E), AX_ – 3 (-17, 19.2E), DSC – 21 (-15, 43.7E)
07 83 AX_ – 2 (-21, 08.2W), CRO – 6 (-19, 06.6E), CAI – 31 (-16, 30.5E), BXO – 4 (-17, 47.8E)
09 76 BXI – 7 (4, 21.2E), HS_ – 1 (13, 73.6E), DAC – 24 (-16, 04.4E), CAI – 4 (-16, 18.7E)
10 102 CRI – 5 (3, 07.5E), HS_ – 2 (13, 61.4E), HS_ – 3 (-16, 29.6W), CSO – 17 (-15, 08.6W), AX_ – 1 (-16, 02.9E), BXI – 2 (-17, 10.8E), BXI – 2 (-8, 43.5E)
11 75 BXI – 4 (4, 07.0W), HA_ – 1 (14, 48.2E), AX_ – 1 (10, 69.3E), HA_ – 2 (-14, 42.7W), EAC – 17 (-15, 19.7W)
12 121 CRI – 7 (6, 21.4W), HS_ – 1 (13, 34.3E), HR_ – 1 (9, 53.5E), DAO – 6 (16, 57.1E), DSO – 2 (19, 72.5E), HK_ – 8 (-15, 57.0W), DAI – 15 (-16, 35.8W), AX_ – 1 (-8, 16.7E)
13 153 ESC – 14 (6, 36.4W), HS_ – 3 (15, 20.2E), HS_ – 1 (10, 38.4E), DSI – 16 (17, 44.7E), ESI – 4 (20, 58.2E), HK_ – 3 (-14, 69.9W), EKC – 14 (-16, 50.9W), DRI – 5 (-8, 01.9E), CRI – 3 (-12, 46.1E)
14 133 DAI – 15 (5, 51.4W), HS_ – 2 (14, 07.5E), HS_ – 2 (10, 25.4E), EAC – 25 (17, 34.9E), AX_ – 1 (20, 50.9E), DAI – 9 (-14, 64.5W), DAI – 9 (-12, 32.7E)
15 147 DAC – 6 (5, 62.4W), CSI – 5 (14, 05.4W), CSO – 2 (10, 12.9E), EKC – 26 (16, 20.4E), CHI – 4 (20, 30.3E), AX_ – 1 (21, 39.1E), EKC – 6 (-13, 76.1W), AX_ – 1 (-9, 24.5W), DSI – 6 (-12, 20.2E)
16 112 CAI – 4 (6, 76.6W), CAI – 7 (14, 13.6W), HS_ – 2 (9, 03.6E), EAC – 32 (19, 13.4E), AX_ – 3 (20, 29.5E), DAI – 4 (-12, 10.7E)
17 99 HS_ – 5 (15, 29.5W), AX_ – 3 (10, 12.9W), FKC – 35 (19, 01.8W), BXI – 2 (22, 14.8E), CAO – 4 (-11, 05.1W)
18 132 ?__ – 7 (15, 40.3W), FKC – 47 (19, 14.4W), CSI – 5 (21, 02.8E), CAO – 7 (-12, 17.4W), DRO – 5 (-15, 76.8E), AX_ – 1 (-11, 80.6E)
19 111 HS_ – 2 (14, 55.8W), FAC – 46 (19, 27.5W), HS_ – 2 (22, 09.3W), HS_ – 1 (-12, 34.0W), FAC – 10 (-13, 63.9E)
20 82 HA_ – 1 (14, 67.9W), FAC – 17 (18, 41.7W), CRO – 4 (22, 21.8W), HS_ – 1 (-12, 47.3W), FAC – 9 (-13, 50.3E)
21 62 FAI – 11 (16, 41.8W), BXI – 3 (17, 19.2W), BXI – 2 (-13, 67.1W), ESI – 6 (-21, 27.5E)
22 106 AX_ – 1 (16, 75.7W), DHO – 3 (20, 62.3W), BXO – 3 (23, 46.7W), AX_ – 1 (-12, 72.5W), DKC – 15 (-13, 22.2E), AX_ – 1 (-26, 23.6E), DKC – 12 (-12, 32.3E)
23 94 CAI – 2 (20, 76.7W), AX_ – 3 (6, 12.4E), CAO – 5 (-11, 03.3E), CAI – 8 (-15, 05.2E), AX_ – 3 (-24, 05.8E), CAO – 13 (-12, 14.8E)
24 52 DSO – 10 (-13, 07.3W), CSI – 8 (-12, 04.2E), BXI – 4 (-12, 21.6E)
25 95 CAI – 9 (6, 12.3W), BXO – 4 (13, 65.2E), HS_ – 1 (-12, 24.1W), CKI – 8 (-15, 18.9W), ?__ – 9 (-12, 06.8W), DAO – 4 (-12, 08.6E)
26 111 CAI – 19 (6, 28.8W), CAI – 13 (13, 49.3E), HS_ – 1 (-12, 40.3W), HH_ – 3 (-15, 36.7W), CSI – 12 (-11, 22.8W), BXO – 3 (-11, 07.5W)
27 116 CAO – 7 (6, 39.6W), DAI – 14 (13, 38.2E), HR_ – 1 (20, 79.7E), HS_ – 1 (-12, 51.5W), CSO – 3 (-16, 45.3W), BXI – 7 (-13, 34.6W), BXO – 2 (-12, 19.3W), AX_ – 1 (-16, 61.4E)
28 86 CSO – 2 (6, 54.8W), HR_ – 1 (8, 18.4W), DAI – 7 (12, 25.5E), HS_ – 1 (21, 67.9E), DAO – 3 (-14, 59.8W), AX_ – 1 (-10, 36.1W), AX_ – 1 (-15, 48.3E)
29 134 CAO – 2 (6, 67.6W), BXI – 4 (8, 31.0W), DAI – 12 (13, 12.7E), HS_ – 1 (21, 55.6E), AX_ – 1 (-12, 77.3W), HS_ – 1 (-16, 74.1W), AX_ – 1 (-10, 49.4W), HS_ – 1 (-28, 02.6W), BXI – 8 (-18, 43.8E), BXI – 3 (-5, 49.7E)
30 183 HS_ – 1 (18, 84.6W), AX_ – 1 (15, 48.5W), DSI – 14 (13, 01.8W), HS_ – 2 (21, 41.2E), DSC – 13 (2, 45.9E), AX_ – 1 (-13, 61.9W), DSC – 6 (-28, 15.9W), HS_ – 1 (-14, 17.3E), DSI – 6 (-18, 27.6E), CSI – 4 (-5, 34.3E), AX_ – 1 (-8, 44.8E), HS_ – 2 (-16, 77.4E), AX_ – 1 (-12, 77.5E)