Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Monthly Sunspot Classification and Coordinates

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April 2024 Monthly report →

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

DrawingDayRClassification and Coordinates
01 48 FAI – 9 (15, 76.2W), BXI – 8 (11, 23.1W), AX_ – 1 (14, 31.6E)
03 33 AX_ – 1 (5, 12.8E), AX_ – 1 (8, 55.5E), HH_ – 1 (7, 77.9E)
04 74 BXO – 3 (11, 60.5W), AX_ – 4 (5, 01.1W), AX_ – 2 (9, 16E), AX_ – 2 (8, 42.9E), HS_ – 2 (7, 64.7E), AX_ – 1 (24, 67.3E)
05 63 BXO – 5 (5, 15.7W), AX_ – 2 (9, 02.3E), AX_ – 1 (8, 30E), HS_ – 2 (7, 51.5E), AX_ – 3 (-11, 11.7W)
06 96 DAI – 8 (5, 29.1W), AX_ – 2 (11, 04.7W), AX_ – 1 (8, 16.4E), HH_ – 3 (7, 38.5E), CRI – 3 (26, 39.5E), BXI – 7 (-11, 27.4W), HH_ – 2 (-8, 79.9E)
07 50 AX_ – 2 (6, 46.3W), HK_ – 3 (8, 23.4E), AX_ – 1 (26, 26.9E), CSI – 4 (-8, 64.8E)
08 62 AX_ – 2 (6, 57.6W), AX_ – 1 (9, 37.1W), HH_ – 3 (7, 11.2E), AX_ – 1 (25, 15.5E), CSO – 5 (-9, 53.1E)
09 41 CHO – 5 (7, 01.4W), AX_ – 1 (26, 02.9E), CSO – 5 (-9, 40.9E)
10 60 HS_ – 7 (7, 13.9W), BXO – 3 (22, 33.3E), CSO – 2 (18, 61.2E), CAI – 8 (-9, 27.4E)
11 92 HS_ – 6 (8, 28W), DAI – 17 (24, 19.6E), BXI – 8 (19, 49.1E), CAI – 10 (-8, 15.2E), HS_ – 1 (-20, 85.2E)
12 95 HS_ – 7 (7, 41.1W), DAI – 17 (25, 05.5E), DAI – 13 (20, 35.3E), CAI – 5 (-7, 00.8W), HS_ – 3 (-20, 68.8E)
13 108 HK_ – 3 (7, 52.8W), CSI – 11 (25, 05.9W), CAI – 3 (19, 24E), CSO – 3 (-8, 12.4W), CSO – 4 (-21, 55E), AX_ – 1 (-11, 73.8E), AX_ – 2 (-13, 76.1E), AX_ – 1 (-17, 80.9E)
14 177 HS_ – 4 (7, 66.8W), DAI – 35 (25, 18W), CAI – 13 (19, 10.8E), CAI – 12 (11, 23.4E), HS_ – 3 (27, 69.4E), CAO – 2 (-8, 25.7W), HS_ – 2 (-21, 42.5E), AX_ – 1 (-11, 60.6E), BXI – 4 (-14, 62.8E), HS_ – 1 (-18, 65.3E)
15 203 HS_ – 3 (7, 79.4W), DAC – 23 (26, 31W), DAI – 16 (18, 02.4W), CAI – 14 (10, 10.3E), DAI – 11 (28, 59.3E), CAO – 3 (-8, 39W), AX_ – 1 (-8, 06.8W), CAI – 5 (-20, 30.1E), BXI – 5 (-12, 49.1E), CAI – 4 (-18, 55.2E), BXI – 8 (-13, 68.3E)
16 160 EHI – 15 (27, 44.4W), BXI – 7 (18, 16.9W), DAI – 7 (11, 03.5W), EKC – 14 (28, 45.5E), CHO – 3 (-7, 53.4W), CSI – 8 (-21, 19.7E), FKC – 36 (-13, 48.1E)
17 261 EKO – 13 (27, 57.5W), HS_ – 3 (10, 20.2W), AX_ – 2 (14, 12.6W), EKC – 25 (28, 33.7E), HS_ – 1 (10, 69.1E), AX_ – 2 (20, 69.4E), HS_ – 1 (13, 72.9E), AX_ – 2 (-4, 68.5W), HS_ – 1 (-8, 66.9W), CSI – 6 (-22, 07.7E), ?__ – 6 (-14, 24.1E), CAI – 10 (-18, 27E), DAI – 11 (-9, 31.6E), CSI – 9 (-14, 37.1E), DKI – 19 (-13, 46.4E)
18 178 HS_ – 2 (27, 71.2W), HS_ – 2 (9, 34.8W), EAI – 22 (27, 20.1E), FAI – 6 (19, 55.2E), DAO – 2 (12, 58E), HS_ – 3 (-20, 08.4W), CAI – 8 (-17, 10E), FAI – 53 (-11, 23.5E)
21 218 EAC – 13 (28, 17.4W), AX_ – 1 (17, 08.6E), HA_ – 1 (11, 16.7E), HA_ – 2 (14, 22E), AX_ – 2 (21, 23.5E), BXI – 6 (14, 40.1E), AX_ – 1 (-21, 46.4W), BXI – 10 (-18, 25.3W), EKI – 19 (-8, 22.8W), CAI – 17 (-14, 17.6W), BXI – 7 (-14, 08.1W), CSI – 8 (-12, 03.2E), AX_ – 1 (-9, 69E)
22 338 BXI – 3 (15, 51.3W), DAI – 20 (26, 29W), DAO – 4 (12, 07.2E), CAI – 17 (21, 10.2E), DAI – 8 (14, 27.6E), AX_ – 1 (1, 56E), AX_ – 2 (-22, 56.9W), AX_ – 2 (-14, 47.6W), CAI – 13 (-18, 39.1W), DAI – 35 (-9, 35.8W), FAI – 40 (-13, 25.3W), CAI – 15 (-10, 10.7W), BXI – 3 (-13, 43E), AX_ – 3 (-9, 57.8E), CAI – 10 (-27, 62.8E), AX_ – 2 (-13, 72.4E)
24 257 AX_ – 3 (27, 60.4W), HS_ – 1 (31, 50W), ?__ – 13 (17, 33.4W), HS_ – 1 (12, 23.3W), HS_ – 1 (14, 17.1W), ESC – 15 (22, 16.2W), HS_ – 1 (14, 04.6W), AX_ – 1 (2, 24.3E), FHC – 42 (-10, 59.7W), AX_ – 4 (-21, 22.9W), BXI – 7 (-14, 15.3E), CAI – 19 (-9, 27.9E), DSO – 4 (-27, 32.2E), BXI – 5 (-13, 43.8E)
25 202 HR_ – 1 (30, 64W), FAC – 21 (17, 38.4W), HS_ – 1 (13, 18.1W), FKC – 13 (-11, 73.6W), BXI – 8 (-23, 35W), CRI – 4 (-14, 04.4E), EAC – 25 (-9, 16.2E), CSI – 10 (-26, 22.4E), BXI – 5 (-12, 31.3E), AX_ – 3 (-12, 45.4E), AX_ – 1 (-9, 72.9E)
26 117 CRO – 3 (17, 62.4W), BXO – 2 (13, 46.5W), CSI – 5 (21, 42W), HR_ – 1 (14, 32.3W), AX_ – 1 (-21, 52.8W), CRO – 3 (-23, 46.2W), CSI – 6 (-7, 02W), HS_ – 1 (-26, 02.6E), BXI – 5 (-9, 03.5E)