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 2023 Monthly report →

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

DrawingDayRClassification and Coordinates
01 160 ?__ – 1 (25, 83.8W), HS_ – 1 (25, 59.3W), BXI – 4 (17, 55.6W), AX_ – 2 (15, 12E), HS_ – 1 (10, 40.6E), AX_ – 1 (23, 47.3E), AX_ – 1 (9, 50.1E), EHC – 9 (-17, 64.3W), EHI – 12 (-18, 32.6W), HK_ – 6 (-15, 50.6E), ESC – 12 (-7, 72.1E)
02 137 HS_ – 1 (25, 73.8W), BXI – 13 (16, 00.7W), HS_ – 1 (10, 27.4E), BXI – 2 (10, 37.7E), CSI – 5 (-17, 77.6W), EHC – 14 (-18, 45.6W), HH_ – 5 (-16, 37.9E), ESC – 16 (-7, 58.4E)
03 136 CRI – 8 (17, 15.5W), CSI – 6 (12, 07.5W), HS_ – 1 (10, 12.3E), AX_ – 1 (11, 19.3E), HS_ – 1 (25, 69.4E), EHC – 14 (-19, 60.5W), HH_ – 1 (-15, 22.7E), ESC – 24 (-7, 42.1E)
05 120 AX_ – 1 (10, 36.8W), BXO – 2 (10, 11W), AX_ – 2 (8, 05.5E), HS_ – 1 (25, 44.8E), BXO – 2 (23, 61.1E), HS_ – 3 (-15, 02.9W), ESI – 20 (-7, 16.7E), CRI – 9 (-15, 64.3E)
06 201 BXO – 2 (14, 52.3W), AX_ – 1 (9, 49W), CAO – 3 (11, 23.4W), AX_ – 1 (10, 33.3E), HS_ – 1 (25, 33.8E), BXO – 3 (17, 37.1E), BXI – 5 (23, 51.1E), AX_ – 1 (9, 66.8E), HK_ – 9 (-14, 14.2W), EAC – 40 (-8, 04.3E), EAI – 25 (-16, 52.9E)
07 212 AX_ – 3 (14, 71.3W), HS_ – 2 (11, 41.1W), AX_ – 1 (12, 18.8E), AX_ – 1 (17, 19.7E), HS_ – 1 (25, 19.9E), AX_ – 1 (20, 24.4E), DSO – 9 (24, 37.7E), HS_ – 5 (-14, 29.3W), AX_ – 4 (-7, 16.2W), CSI – 26 (-8, 08.4W), BXI – 35 (-15, 38.2E), CSI – 4 (-22, 74E)
08 200 ?__ – 1 (22, 76.8W), ?__ – 1 (16, 74.7W), AX_ – 1 (11, 50.9W), AX_ – 2 (16, 07.6E), HS_ – 1 (24, 09.2E), DAI – 13 (23, 27E), HH_ – 1 (-15, 40.1W), CRI – 26 (-8, 22.7W), DAC – 31 (-15, 24.9E), HH_ – 1 (-22, 59.1E), AX_ – 1 (-8, 68.2E), HS_ – 1 (-22, 70E)
10 143 AX_ – 1 (26, 43.4W), HS_ – 1 (25, 19.7W), DAI – 13 (23, 02.7W), HS_ – 1 (-15, 70.4W), AX_ – 1 (-7, 58.6W), FKC – 31 (-14, 05.7W), EAI – 3 (-23, 36.7E), AX_ – 1 (-8, 39.1E), AX_ – 1 (-12, 71.7E)
11 135 HS_ – 1 (25, 32.6W), CSI – 8 (23, 14.7W), HS_ – 1 (-15, 79.9W), BXI – 48 (-15, 17.1W), HS_ – 2 (-22, 19.7E), AX_ – 1 (-8, 26.9E), HS_ – 4 (-22, 29.9E)
12 97 HS_ – 1 (26, 45.1W), DSO – 2 (23, 29.9W), BXI – 23 (-14, 29.7W), ESI – 8 (-22, 11.3E), AX_ – 2 (-12, 35.8E), AX_ – 1 (-13, 45.1E)
13 79 HA_ – 1 (26, 57.2W), HA_ – 5 (23, 41.9W), BXI – 8 (-16, 39.4W), EAI – 11 (-23, 01.2E), BXI – 4 (-11, 61.3E)
14 106 HA_ – 1 (26, 72.8W), HA_ – 3 (24, 57.8W), HA_ – 2 (16, 67.3E), CAO – 5 (-23, 17.6W), DAI – 14 (-11, 43.3E), DAO – 3 (-14, 71.7E), ?__ – 8 (-21, 74.9E)
15 132 ?__ – 1 (26, 82.8W), AX_ – 1 (24, 68.2W), AX_ – 1 (15, 56.5E), ?__ – 1 (16, 78.5E), ?__ – 1 (10, 80.2E), AK_ – 2 (-23, 30.2W), ESI – 19 (-11, 32.1E), EKI – 6 (-15, 60.4E), CRI – 10 (-22, 63.8E)
16 136 BXO – 3 (28, 36W), AX_ – 2 (19, 20.3W), DSO – 2 (11, 69.3E), HS_ – 2 (-22, 43W), DSC – 24 (-10, 18.5E), DSC – 25 (-14, 46.6E), CSI – 8 (-21, 53.1E)
17 91 CSO – 2 (11, 54.5E), HS_ – 1 (-25, 55.9W), ESC – 13 (-11, 06.5E), ESI – 13 (-15, 34E), HS_ – 1 (-21, 42.3E), HA_ – 1 (-19, 76E)
18 163 AX_ – 2 (17, 35W), AX_ – 1 (16, 23E), DAI – 8 (12, 40.4E), ?__ – 3 (23, 68.8E), HR_ – 1 (-23, 70.4W), AX_ – 1 (-10, 59.5W), EAI – 20 (-10, 08.5W), EAC – 23 (-14, 19.1E), AX_ – 3 (-21, 27.8E), HS_ – 1 (-19, 66E)
19 146 AX_ – 1 (20, 09.8E), AX_ – 4 (11, 23.9E), AX_ – 3 (11, 31.7E), BXO – 3 (22, 54.3E), AX_ – 1 (-10, 73.7W), BXO – 3 (-22, 49.8W), DSO – 7 (-11, 21.4W), ESI – 11 (-15, 06.7E), AX_ – 1 (-22, 14.3E), HS_ – 1 (-19, 52.8E), AX_ – 1 (-15, 83.3E)
20 178 BXI – 6 (23, 36.1W), DAI – 9 (12, 15.1E), AX_ – 2 (17, 42.1E), CAI – 7 (23, 42.6E), BXI – 4 (10, 69.1E), CAI – 11 (-22, 61.8W), DAI – 16 (-11, 34.1W), EAI – 15 (-15, 07.2W), HA_ – 3 (-19, 39.6E), CAI – 5 (-15, 70.7E)
21 201 DSI – 3 (23, 49.7W), HS_ – 1 (11, 00.9W), DSI – 6 (21, 28.6E), AX_ – 2 (16, 29.6E), BXI – 4 (8, 32.8E), AX_ – 3 (22, 34.6E), HS_ – 5 (9, 56.7E), DSI – 8 (-23, 76.5W), DAI – 4 (-12, 49.4W), EKI – 21 (-15, 19.4W), HK_ – 8 (-21, 29.6E), HS_ – 5 (-16, 58.5E), AX_ – 1 (-12, 80.2E)
22 224 CAI – 4 (24, 63.3W), AX_ – 2 (17, 27.9W), CRI – 8 (20, 13.5W), CAO – 3 (12, 11.2W), AX_ – 1 (15, 13.5E), CAI – 10 (22, 17.4E), BXI – 4 (8, 18.3E), BXO – 6 (9, 41.9E), ?__ – 1 (21, 82E), CRO – 3 (-10, 62.3W), CKI – 12 (-14, 34.4W), AX_ – 3 (-18, 02.8W), CAI – 11 (-20, 14.7E), HS_ – 5 (-16, 45.6E), AX_ – 1 (-11, 62.3E)
23 221 CSO – 4 (11, 31.2W), DSI – 8 (20, 26.7W), DSI – 22 (22, 05.1E), CSI – 6 (10, 28.6E), HS_ – 3 (10, 48.7E), AX_ – 3 (22, 70.9E), HS_ – 15 (-15, 48.6W), BXI – 9 (-19, 15.1W), CSI – 17 (-19, 00.5W), HS_ – 10 (-16, 32.6E), AX_ – 1 (-11, 49.1E), BXO – 3 (-30, 58.4E)
24 238 BXI – 11 (10, 45.7W), BXO – 8 (21, 40.9W), BXI – 8 (18, 11.4W), AX_ – 4 (10, 09.5W), CSI – 22 (23, 07.4W), HS_ – 3 (9, 12.8E), BXO – 3 (9, 33.3E), AX_ – 1 (22, 54.5E), CSI – 6 (-14, 62.5W), BXI – 6 (-18, 28.6W), CSI – 12 (-19, 13.5W), AX_ – 3 (-17, 03.7W), DSO – 8 (-16, 18.7E), BXO – 3 (-30, 44.5E)
25 163 BXI – 6 (11, 60.2W), AX_ – 1 (17, 53.9W), AX_ – 4 (21, 52.2W), AX_ – 2 (17, 25.8W), DAI – 17 (24, 22.2W), AX_ – 1 (10, 01W), AX_ – 3 (22, 41.2E), HS_ – 1 (-14, 78.2W), AX_ – 1 (-18, 40.9W), CSI – 6 (-20, 27.8W), CSI – 11 (-15, 05.7E)
26 113 AX_ – 1 (21, 63.7W), DSI – 16 (23, 33.4W), AX_ – 1 (9, 12.3W), BXO – 5 (23, 28.8E), AX_ – 3 (15, 35.3E), AX_ – 1 (-19, 41.7W), CAO – 5 (-14, 09.5W), AX_ – 1 (-30, 21.5E)
27 176 AX_ – 2 (21, 75.3W), DAI – 28 (24, 45.5W), HS_ – 1 (9, 24W), BXI – 4 (22, 17E), CAI – 32 (15, 22.4E), CAI – 4 (-19, 52.5W), CAI – 9 (-13, 22.6W), BXI – 5 (-32, 08.2E), HS_ – 1 (-15, 71.5E)
28 128 BXI – 12 (24, 57.9W), AX_ – 1 (9, 39W), BXI – 4 (22, 03.3E), DKC – 36 (15, 08.8E), HS_ – 1 (-19, 68.5W), AX_ – 3 (-16, 34.7W), AX_ – 1 (-15, 59.3E)
30 121 AX_ – 3 (16, 63.9W), FKC – 52 (16, 19.2W), AX_ – 2 (-16, 62.3W), HA_ – 2 (-15, 31.2E), AX_ – 1 (-7, 48.8E), ?__ – 1 (-12, 83E)