Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Monthly Sunspot Classification and Coordinates

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July 2025 Monthly report →

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

DrawingDayRClassification and Coordinates
01 123 BXI – 2 (8, 57.3W), HS_ – 5 (13, 17.6W), BXI – 7 (14, 09.3W), CSI – 4 (8, 04.1W), HS_ – 2 (21, 29.9E), BXI – 9 (2, 35.3E), BXI – 12 (-17, 12.3E), AX_ – 2 (-16, 66.9E)
02 107 AX_ – 3 (8, 71.3W), CSO – 5 (13, 28.6W), HR_ – 1 (8, 22.8W), HS_ – 1 (22, 15.4E), BXI – 6 (3, 18.4E), CAO – 4 (-27, 42.3W), DAO – 6 (-17, 00.7E), HS_ – 1 (-5, 10.8E)
03 122 CHO – 4 (13, 39.8W), HA_ – 2 (7, 33.9W), HS_ – 1 (21, 05.0E), DSI – 8 (3, 08.6E), CRO – 2 (-28, 53.4W), DAI – 19 (-18, 09.4W), CSO – 2 (-5, 03.3W), AX_ – 4 (-17, 37.8E)
04 94 HS_ – 2 (11, 56.7W), HS_ – 1 (21, 08.9W), CAI – 15 (3, 05.9W), DAI – 10 (-19, 23.7W), AX_ – 2 (-5, 13.9W), BXI – 4 (-10, 26.2E)
05 74 HH_ – 1 (12, 69.3W), HS_ – 1 (22, 21.4W), DSC – 9 (3, 19.5W), DSI – 8 (-18, 36.4W), CRI – 5 (-10, 13.2E)
06 97 HH_ – 1 (11, 80.8W), HS_ – 1 (22, 34.3W), DSI – 3 (3, 32.5W), AX_ – 2 (10, 05.2E), CSI – 8 (-20, 50.1W), DSO – 3 (-22, 04.7W), CRI – 9 (-11, 00.6E)
07 122 HS_ – 2 (22, 46.6W), CSI – 4 (3, 44.5W), AX_ – 2 (10, 06.9W), DSI – 7 (-20, 62.5W), AX_ – 2 (-4, 46.5W), DSC – 6 (-22, 17.9W), AX_ – 7 (-10, 12.4W), AX_ – 1 (-16, 05.2W), HH_ – 1 (-8, 77.8E)
09 85 HR_ – 1 (23, 71.0W), CSI – 10 (18, 08.6W), EKI – 8 (20, 76.4E), AX_ – 1 (-9, 39.0W), AX_ – 1 (-10, 13.6E), CAO – 4 (-8, 53.6E)
10 89 DAI – 13 (18, 23.0W), AX_ – 1 (10, 31.5E), EKC – 8 (19, 62.8E), AX_ – 1 (-15, 59.7W), BXO – 3 (-15, 43.8W), CSO – 3 (-8, 40.4E)
11 88 CSI – 9 (18, 36.8W), CSI – 8 (28, 02.3W), AX_ – 1 (21, 32.4E), DSI – 8 (21, 47.9E), HS_ – 1 (-8, 23.7E), AX_ – 1 (-16, 78.4E)
12 114 CSI – 6 (18, 50.7W), DAI – 10 (28, 17.6W), DAI – 12 (21, 18.4E), HA_ – 2 (18, 28.8E), HK_ – 7 (19, 37.3E), HS_ – 1 (-8, 10.6E), DRO – 6 (-15, 65.8E)
13 125 DAI – 5 (18, 65.6W), EKC – 11 (28, 30.9W), DAI – 10 (21, 04.6E), AX_ – 2 (18, 14.3E), CHO – 6 (19, 23.8E), CAO – 3 (-13, 66.4W), HS_ – 2 (-8, 03.7W), DRO – 6 (-15, 52.9E)
15 187 FSI – 6 (28, 55.7W), DKI – 15 (21, 19.6W), HS_ – 1 (18, 10.7W), HK_ – 5 (20, 01.9W), CRI – 12 (23, 09.8E), DSI – 11 (1, 41.7E), AX_ – 1 (6, 73.2E), HS_ – 1 (-8, 29.8W), AX_ – 2 (-8, 20.7E), CRO – 10 (-16, 26.8E), BXO – 2 (-25, 28.3E), HR_ – 1 (-15, 68.2E)
16 210 HS_ – 1 (27, 72.7W), BXO – 2 (29, 59.8W), DKI – 17 (22, 30.6W), AX_ – 1 (19, 22.1W), ?__ – 6 (20, 12.3W), CAI – 23 (24, 02.2W), DAC – 24 (2, 30.4E), HS_ – 1 (-8, 41.0W), BXI – 3 (-7, 08.0E), BXI – 6 (-25, 15.7E), AX_ – 5 (-17, 17.1E), HS_ – 1 (-14, 56.0E)
17 215 EHC – 19 (22, 40.9W), CKO – 14 (21, 25.5W), EKC – 26 (24, 14.2W), EKC – 25 (1, 18.2E), AX_ – 1 (6, 50.7E), AX_ – 2 (-7, 54.3W), CSI – 4 (-7, 04.5W), BXI – 14 (-24, 04.4E), AX_ – 9 (-16, 05.0E), HS_ – 1 (-14, 44.7E)
18 132 FAI – 7 (21, 59.6W), DAI – 13 (21, 42.8W), EKC – 19 (25, 30.7W), DKC – 26 (2, 01.2E), BXI – 6 (-7, 21.4W), AX_ – 1 (-14, 28.7E)
20 136 EAI – 5 (21, 70.2W), EAC – 12 (25, 55.1W), CAI – 4 (4, 30.4W), AX_ – 4 (1, 21.1W), BXI – 5 (11, 14.5W), EAC – 8 (17, 64.3E), AX_ – 2 (-7, 51.7W), AX_ – 1 (-12, 41.1W), DSI – 5 (-13, 62.9E)
21 195 DKC – 6 (23, 73.2W), CKI – 8 (26, 62.6W), DHI – 6 (3, 42.1W), CRI – 5 (11, 25.2W), AX_ – 1 (7, 00.9E), AX_ – 2 (9, 19.9E), EHC – 9 (17, 52.3E), AX_ – 1 (9, 70.5E), AX_ – 2 (-7, 63.9W), AX_ – 1 (-12, 52.8W), AX_ – 1 (-1, 30.7W), AX_ – 1 (-15, 07.5W), AX_ – 1 (-16, 03.5E), CSI – 11 (-14, 51.1E)
22 96 ?__ – 3 (25, 74.5W), HS_ – 1 (4, 59.2W), EAI – 13 (17, 36.1E), AX_ – 1 (10, 55.0E), CSI – 6 (-14, 34.8E), AX_ – 1 (-27, 61.7E), ?__ – 1 (-13, 77.4E)
23 100 HS_ – 1 (5, 69.2W), EHI – 17 (17, 26.3E), CAI – 13 (-13, 25.9E), CAI – 6 (-28, 52.4E), AX_ – 2 (-14, 65.8E), AX_ – 1 (-18, 74.0E)
24 120 HH_ – 1 (5, 81.7W), EHC – 11 (17, 13.5E), AX_ – 1 (9, 31.3E), AX_ – 1 (10, 71.2E), AX_ – 1 (-15, 37.9W), HS_ – 1 (-14, 10.3E), DSI – 9 (-28, 40.7E), DSO – 3 (-16, 58.8E), AX_ – 2 (-9, 70.7E)
25 157 DKI – 9 (16, 01.6W), AX_ – 1 (9, 16.4E), AX_ – 1 (20, 17.5E), HR_ – 1 (10, 55.7E), DRO – 3 (-16, 51.4W), HS_ – 1 (-14, 05.0W), AX_ – 2 (-7, 13.5E), DKI – 13 (-29, 27.1E), DAO – 5 (-16, 44.5E), DRI – 10 (-8, 54.6E), HR_ – 1 (-8, 69.8E)
29 139 (10 groups — details not recorded)
30 143 HH_ – 1 (16, 72.7W), AX_ – 2 (24, 17.5W), HA_ – 1 (12, 74.9E), HS_ – 1 (-14, 72.5W), AX_ – 4 (-28, 42.4W), HA_ – 3 (-30, 32.3W), ?__ – 5 (-14, 28.0W), ?__ – 3 (-20, 18.6W), CAI – 16 (-9, 14.9W), CHI – 7 (-13, 46.3E)
31 158 HS_ – 1 (16, 80.5W), CRI – 8 (24, 27.6W), BXI – 10 (11, 01.4E), CSO – 3 (13, 68.8E), DSO – 9 (-29, 47.6W), HS_ – 2 (-13, 38.4W), HA_ – 2 (-20, 28.2W), CRI – 15 (-10, 24.4W), AX_ – 1 (-18, 33.2E), DSI – 7 (-13, 36.5E)