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

Statistics of sunspot activity

Solar activity in 1990

Visual indices of solar activity by National Geophysical Data Center

 
Average by
month
I
II
III
IV
V
VI
VII
VIII
IX
X
XI
XII
days
months
N30283130313031313031303130.3330.33
W206.69164.66182.41184.27169.42145.63186.84246.42161.64190.32160.22183.94182.15181.87
Wn86.4684.2269.9592.4386.1270.3193.08114.6873.0086.9070.0799.5485.6785.56
Ws120.2380.44112.4691.8583.3075.3293.76131.7488.64103.4290.1684.4096.4896.31
n10.999.109.519.888.418.3110.1312.6310.3610.338.489.389.809.79
A1.191.521.291.151.151.691.361.351.461.711.261.421.381.38
B1.961.571.191.711.341.361.331.971.501.411.171.331.481.49
C2.251.941.721.951.611.751.712.892.621.681.661.731.961.96
D1.791.701.972.141.551.631.852.791.412.141.842.161.911.91
E0.610.400.270.370.620.130.450.760.190.330.180.280.380.38
F0.280.070.340.250.300.070.290.300.000.070.310.190.200.21
G1.090.460.750.680.500.570.930.900.690.890.850.970.780.77
H0.140.220.130.020.070.150.080.480.160.310.020.050.150.15
I1.681.241.841.611.270.952.141.212.331.801.201.251.551.54
x3.153.092.482.862.493.052.693.312.963.122.432.752.862.87
r0.550.370.260.410.460.370.360.620.400.500.370.440.420.42
s2.211.701.842.051.741.542.141.983.102.301.831.712.012.01
a3.892.813.533.642.602.403.313.932.922.562.653.063.123.11
h0.240.190.180.150.100.170.150.480.220.340.340.170.230.23
k0.950.951.210.761.020.781.492.310.771.520.871.251.171.16
x3.012.973.262.782.492.803.583.043.953.822.472.723.073.07
o6.655.205.076.084.554.725.258.006.075.625.215.755.685.68
i1.270.741.140.981.190.751.251.410.330.890.780.840.970.96
c0.050.190.040.040.180.040.060.170.010.000.030.070.070.07
CV151.79121.07141.84131.80122.78105.94153.84219.81124.63158.73127.69141.75142.16141.81
CVn64.3066.9049.3776.6865.8947.0083.71106.8057.1863.4764.9084.4269.3469.22
CVs87.4954.1792.4655.1356.8958.9470.13113.0067.4595.2662.7957.3372.8272.59