The Sunspot Observer - Average annual indices of solar activity NGDC - Solar activity in 1997

Statistics of sunspot activity

Solar activity in 1997

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
W10.140.0012.3622.5126.7020.7416.3632.4755.4631.0448.3352.2927.4927.37
Wn3.110.004.925.5520.9513.8311.3323.7927.2322.9531.3133.9916.6816.58
Ws7.030.007.4416.965.756.915.038.6828.238.0917.0218.3010.8110.79
n0.810.000.801.411.901.421.232.132.822.082.413.121.691.68
A0.390.000.170.280.510.490.510.470.420.300.560.500.390.38
B0.320.000.250.280.430.370.500.350.200.540.230.490.330.33
C0.060.000.240.440.360.190.050.370.430.620.490.600.330.32
D0.040.000.040.260.150.290.160.280.690.260.230.430.240.24
E0.000.000.000.030.010.000.000.090.160.010.320.270.070.07
F0.000.000.000.000.000.000.000.000.240.000.140.050.040.04
G0.000.000.050.050.020.020.000.000.350.030.280.200.080.08
H0.000.000.000.000.010.000.000.020.040.000.000.120.020.02
I0.000.000.060.070.400.060.010.560.280.310.150.460.190.20
x0.710.000.420.560.950.861.000.820.620.840.790.990.720.71
r0.060.000.090.140.150.220.110.160.130.220.280.190.150.15
s0.040.000.130.280.610.180.050.870.820.680.381.010.420.42
a0.000.000.170.400.180.150.060.260.660.290.480.490.260.26
h0.000.000.000.010.010.000.000.020.130.000.060.250.040.04
k0.000.000.000.010.010.000.000.000.460.050.420.190.100.10
x0.390.000.240.350.920.550.511.040.740.620.711.080.600.60
o0.420.000.561.000.910.840.710.951.501.421.231.710.940.94
i0.000.000.010.060.070.030.000.120.490.050.300.170.110.11
c0.000.000.000.000.000.000.000.020.090.000.180.160.040.04
CV2.190.004.8212.5613.199.194.8219.0456.1617.6041.3347.4919.0719.03
CVn0.840.002.062.3211.393.524.1314.4519.6212.0824.7332.0610.6710.60
CVs1.360.002.7610.251.795.680.694.5936.545.5216.6115.448.408.43