The Sunspot Observer - Average annual indices of solar activity - Solar activity in 1991

Statistics of sunspot activity

Solar activity in 1991

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
N  111189171255218.108.10
W  246.00180.73183.06240.33321.12388.17204.20313.60175.00155.00258.06240.72
Wn  28.0083.1882.94139.22159.18139.0867.0095.2037.000.00110.4883.08
Ws  218.0097.55100.11101.11161.94249.08137.20218.40138.00155.00147.58157.64
n  10.008.098.339.6710.8812.006.807.809.005.009.408.76
A  2.001.911.220.780.761.000.401.000.000.001.040.91
B  0.002.002.111.331.061.501.000.403.000.001.491.24
C  2.000.551.281.891.473.331.001.202.001.001.591.57
D  1.001.091.062.222.821.672.001.400.502.001.731.58
E  0.000.910.720.561.180.670.401.000.500.000.790.59
F  2.000.090.110.330.410.920.601.200.001.000.440.67
G  0.000.360.170.110.410.170.201.000.500.000.300.29
H  2.000.551.331.561.651.671.200.002.001.001.301.30
I  1.000.640.330.891.121.080.000.600.500.000.720.62
x  2.003.913.332.111.822.501.401.403.000.002.532.15
r  1.000.360.280.560.760.170.800.201.000.000.460.51
s  3.002.092.614.223.413.422.002.203.001.002.942.69
a  3.000.820.781.222.824.001.601.601.502.001.901.93
h  0.000.090.110.220.290.250.200.200.500.000.200.19
k  1.000.821.221.331.761.670.802.200.002.001.371.28
x  5.003.092.893.223.533.751.601.602.501.003.052.82
o  3.003.093.443.893.475.002.403.004.501.003.583.28
i  1.001.451.111.893.062.252.202.201.501.001.961.77
c  1.000.450.890.670.821.000.601.000.502.000.800.89
CV  145.00105.27123.78164.78209.59197.75123.40194.0096.00150.00159.00150.96
CVn  12.0057.2757.9494.67109.4780.4246.4070.0028.000.0074.0955.62
CVs  133.0048.0065.8370.11100.12117.3377.00124.0068.00150.0084.9195.34