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 2016 Monthly report →

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

DrawingDayRClassification and Coordinates
01 11 HH_ – 1 (-3, 24W)
02 12 HS_ – 2 (-1, 35W)
03 11 HS_ – 1 (-4, 50W)
04 59 CRI – 5 (13, 20W), CAI – 11 (6, 02E), AX_ – 2 (15, 21E), HS_ – 1 (-4, 64W)
05 29 CRI – 8 (7, 13W), HS_ – 1 (-4, 77W)
06 22 CAI – 12 (6, 26W)
07 18 BXI – 8 (6, 37W)
08 26 BXO – 3 (6, 56W), EHC – 3 (12, 74E)
09 34 BXO – 2 (6, 67W), EAI – 12 (11, 66E)
10 36 EKC – 26 (10, 52E)
11 43 BXO – 4 (15, 01W), EKI – 19 (10, 38E)
12 33 HS_ – 2 (13, 17W), EKC – 11 (10, 25E)
13 74 BXI – 6 (14, 27W), EKI – 37 (10, 12E), AX_ – 1 (14, 71E)
14 65 AX_ – 1 (14, 43W), AX_ – 2 (16, 33W), CKI – 32 (11, 00E)
15 73 AX_ – 1 (13, 57W), FKI – 41 (11, 12W), AX_ – 1 (10, 64E)
16 92 HS_ – 1 (4, 82W), FHC – 48 (10, 28W), AX_ – 2 (6, 72E), HS_ – 1 (7, 78E)
17 54 EKI – 30 (11, 41W), HA_ – 4 (7, 65E)
18 52 CHI – 11 (9, 55W), AX_ – 1 (8, 23E), CSI – 10 (5, 48E)
19 31 CKI – 6 (10, 68W), CAI – 5 (5, 36E)
20 28 CRI – 7 (5, 22E), ?__ – 1 (-1, 84E)
21 23 HS_ – 2 (5, 11E), HS_ – 1 (-1, 67E)
22 11 HS_ – 1 (-2, 53E)
23 11 HS_ – 1 (-2, 39E)
24 41 HS_ – 6 (5, 30W), AX_ – 4 (6, 58E), HS_ – 1 (-2, 27E)
25 56 CRI – 12 (4, 44W), AX_ – 2 (11, 50E), HS_ – 1 (4, 69E), HS_ – 1 (-3, 13E)
26 61 CRI – 4 (5, 59W), HA_ – 2 (5, 55E), CAO – 2 (15, 65E), AX_ – 2 (-8, 27W), HS_ – 1 (-3, 01E)
27 97 BXO – 3 (6, 74W), HA_ – 4 (6, 41E), HA_ – 3 (15, 51E), CAO – 6 (17, 53E), BXO – 7 (-8, 40W), HS_ – 1 (-2, 13W), DRO – 3 (-4, 44E)
28 80 CAI – 5 (6, 25E), DAI – 10 (16, 37E), ?__ – 1 (17, 76E), DAI – 13 (-9, 56W), HS_ – 1 (-3, 27W)
30 122 AX_ – 3 (15, 04W), CSI – 10 (6, 01W), DAC – 13 (16, 12E), BXI – 7 (16, 41E), HS_ – 1 (16, 50E), AX_ – 6 (22, 60E), AX_ – 1 (-11, 78W), HS_ – 1 (-3, 54W)