Statistics of sunspot activity
April, 1990
Visual indices of solar activity by author's observations
Date | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | Average | % |
W |   |   | 119 |   | 120 |   | 117 |   |   | 76 |   | 43 | 140 | 148 |   | 183 | 194 | 231 |   | 216 | 236 |   |   | 164 |   | 113 |   |   |   |   | 150.00 | 100 |
Wn |   |   | 68 |   | 72 |   | 65 |   |   | 50 |   | 32 | 82 | 79 |   | 102 | 104 | 101 |   | 92 | 105 |   |   | 84 |   | 49 |   |   |   |   | 77.50 | 51.67 |
Ws |   |   | 51 |   | 48 |   | 52 |   |   | 26 |   | 11 | 58 | 69 |   | 81 | 90 | 130 |   | 124 | 131 |   |   | 80 |   | 64 |   |   |   |   | 72.50 | 48.33 |
n |   |   | 7 |   | 7 |   | 8 |   |   | 6 |   | 3 | 8 | 7 |   | 8 | 8 | 9 |   | 9 | 10 |   |   | 10 |   | 8 |   |   |   |   | 7.71 | 100 |
A |   |   | 0 |   | 0 |   | 0 |   |   | 0 |   | 2 | 1 | 0 |   | 1 | 1 | 0 |   | 1 | 0 |   |   | 0 |   | 0 |   |   |   |   | 0.43 | 5.56 |
B |   |   | 2 |   | 2 |   | 4 |   |   | 2 |   | 0 | 2 | 1 |   | 2 | 2 | 5 |   | 1 | 1 |   |   | 1 |   | 2 |   |   |   |   | 1.93 | 25.00 |
C |   |   | 0 |   | 0 |   | 2 |   |   | 1 |   | 0 | 0 | 2 |   | 2 | 2 | 1 |   | 4 | 4 |   |   | 3 |   | 1 |   |   |   |   | 1.57 | 20.37 |
D |   |   | 1 |   | 1 |   | 0 |   |   | 1 |   | 1 | 2 | 2 |   | 0 | 0 | 1 |   | 0 | 1 |   |   | 5 |   | 3 |   |   |   |   | 1.29 | 16.67 |
E |   |   | 1 |   | 1 |   | 0 |   |   | 0 |   | 0 | 0 | 1 |   | 1 | 1 | 0 |   | 0 | 2 |   |   | 0 |   | 0 |   |   |   |   | 0.50 | 6.48 |
F |   |   | 0 |   | 0 |   | 0 |   |   | 0 |   | 0 | 2 | 1 |   | 1 | 1 | 2 |   | 2 | 1 |   |   | 0 |   | 0 |   |   |   |   | 0.71 | 9.26 |
G |   |   | 0 |   | 0 |   | 0 |   |   | 0 |   | 0 | 0 | 0 |   | 0 | 0 | 0 |   | 0 | 0 |   |   | 0 |   | 0 |   |   |   |   | 0.00 | 0.00 |
H |   |   | 0 |   | 0 |   | 1 |   |   | 1 |   | 0 | 0 | 0 |   | 0 | 0 | 0 |   | 1 | 1 |   |   | 0 |   | 1 |   |   |   |   | 0.36 | 4.63 |
I |   |   | 3 |   | 3 |   | 1 |   |   | 1 |   | 0 | 1 | 0 |   | 1 | 1 | 0 |   | 0 | 0 |   |   | 1 |   | 1 |   |   |   |   | 0.93 | 12.04 |
x |   |   | 2 |   | 2 |   | 4 |   |   | 2 |   | 2 | 3 | 1 |   | 3 | 3 | 5 |   | 2 | 1 |   |   | 1 |   | 2 |   |   |   |   | 2.36 | 30.56 |
r |   |   | 1 |   | 0 |   | 0 |   |   | 0 |   | 0 | 1 | 0 |   | 0 | 0 | 0 |   | 0 | 0 |   |   | 0 |   | 0 |   |   |   |   | 0.14 | 1.85 |
s |   |   | 3 |   | 3 |   | 3 |   |   | 3 |   | 1 | 2 | 3 |   | 2 | 2 | 1 |   | 1 | 1 |   |   | 2 |   | 3 |   |   |   |   | 2.14 | 27.78 |
a |   |   | 0 |   | 1 |   | 0 |   |   | 0 |   | 0 | 1 | 2 |   | 2 | 2 | 2 |   | 4 | 6 |   |   | 6 |   | 3 |   |   |   |   | 2.07 | 26.85 |
h |   |   | 1 |   | 0 |   | 1 |   |   | 1 |   | 0 | 0 | 0 |   | 0 | 0 | 0 |   | 0 | 0 |   |   | 0 |   | 0 |   |   |   |   | 0.21 | 2.78 |
k |   |   | 0 |   | 1 |   | 0 |   |   | 0 |   | 0 | 1 | 1 |   | 1 | 1 | 1 |   | 2 | 2 |   |   | 1 |   | 0 |   |   |   |   | 0.79 | 10.19 |
x |   |   | 3 |   | 3 |   | 2 |   |   | 2 |   | 2 | 2 | 0 |   | 2 | 2 | 0 |   | 2 | 1 |   |   | 1 |   | 2 |   |   |   |   | 1.71 | 22.22 |
o |   |   | 2 |   | 1 |   | 3 |   |   | 4 |   | 0 | 4 | 3 |   | 2 | 3 | 5 |   | 5 | 3 |   |   | 4 |   | 4 |   |   |   |   | 3.07 | 39.81 |
i |   |   | 2 |   | 3 |   | 3 |   |   | 0 |   | 1 | 2 | 3 |   | 4 | 3 | 4 |   | 2 | 6 |   |   | 4 |   | 1 |   |   |   |   | 2.71 | 35.19 |
c |   |   | 0 |   | 0 |   | 0 |   |   | 0 |   | 0 | 0 | 1 |   | 0 | 0 | 0 |   | 0 | 0 |   |   | 1 |   | 1 |   |   |   |   | 0.21 | 2.78 |
CV |   |   | 104 |   | 107 |   | 83 |   |   | 90 |   | 30 | 125 | 151 |   | 107 | 106 | 119 |   | 146 | 199 |   |   | 183 |   | 107 |   |   |   |   | 118.36 | 100 |
CVn |   |   | 66 |   | 78 |   | 66 |   |   | 63 |   | 29 | 97 | 93 |   | 73 | 71 | 56 |   | 67 | 106 |   |   | 98 |   | 64 |   |   |   |   | 73.36 | 61.98 |
CVs |   |   | 38 |   | 29 |   | 17 |   |   | 27 |   | 1 | 28 | 58 |   | 34 | 35 | 63 |   | 79 | 93 |   |   | 85 |   | 43 |   |   |   |   | 45.00 | 38.02 |
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