The Sunspot Observer - Average annual indices of solar activity - Solar activity in 1990

Statistics of sunspot activity

Solar activity in 1990

Visual indices of solar activity by author's observations

 
Average by
month
I
II
III
IV
V
VI
VII
VIII
IX
X
XI
XII
days
months
N510111417814521  8.708.70
W131.6081.80130.55150.00125.53114.00146.29327.00132.50233.00  140.68157.23
Wn57.4040.0038.0077.5061.5350.6376.86114.0055.50111.00  63.3268.24
Ws74.2041.8092.5572.5064.0063.3769.43213.0077.00122.00  77.3688.98
n7.605.206.827.716.416.507.6415.008.5012.00  7.418.34
A0.200.800.450.430.590.381.001.400.001.00  0.630.63
B1.800.501.001.931.240.880.793.202.502.00  1.311.58
C2.001.101.451.571.351.501.503.401.501.00  1.561.64
D0.800.901.091.290.761.621.502.001.001.00  1.181.20
E0.400.400.450.500.760.500.711.600.000.00  0.610.53
F0.600.100.270.710.240.120.070.800.000.00  0.310.29
G0.600.100.450.000.410.500.501.000.002.00  0.390.56
H0.400.400.550.360.410.880.501.403.502.00  0.621.04
I0.800.901.090.930.650.121.070.200.003.00  0.790.88
x2.001.301.452.361.821.251.794.602.503.00  1.942.21
r0.200.300.090.140.410.250.290.800.502.00  0.310.50
s2.401.302.182.142.122.502.214.204.004.00  2.292.71
a2.001.101.822.071.181.752.501.001.000.00  1.681.44
h0.400.700.090.210.000.000.141.800.001.00  0.290.43
k0.600.501.180.790.880.750.712.600.502.00  0.911.05
x1.402.102.091.711.651.382.573.003.506.00  2.052.54
o3.801.602.823.072.883.883.297.404.503.00  3.263.62
i2.401.501.642.711.651.001.713.600.503.00  1.901.97
c0.000.000.270.210.240.250.071.000.000.00  0.210.20
CV115.0089.90119.18118.3699.29108.75114.57312.0088.00211.00  121.28137.60
CVn56.8050.8025.7373.3653.8248.5070.6491.0030.50114.00  57.7561.52
CVs58.2039.1093.4545.0045.4760.2543.93221.0057.5097.00  63.5376.09