The Sunspot Observer - Average annual indices of solar activity NGDC - February, 1991

Statistics of sunspot activity

February, 1991

Visual indices of solar activity by National Geophysical Data Center

Date12345678910111213141516171819202122232425262728Average%
W298.80301.50295.80175.60174.71168.67144.17158.20191.29181.60189.50206.00227.00228.67244.43238.33203.67267.71291.14272.80356.83344.20311.67368.00275.25257.13261.40190.33243.73100
Wn62.2068.5054.2032.2048.1452.3355.3370.60101.8690.8092.7597.5096.0086.6780.7163.6738.0049.0058.7168.0095.1794.0073.6775.0068.2574.5077.6059.3370.8829.08
Ws236.60233.00241.60143.40126.57116.3388.8387.6089.4390.8096.75108.50131.00142.00163.71174.67165.67218.71232.43204.80261.67250.20238.00293.00207.00182.63183.80131.00172.8570.92
n11.8013.0013.808.409.009.839.179.609.009.4010.7511.0011.5012.5013.4313.6712.5014.8614.7113.2015.1714.6013.0012.0012.3810.8811.809.6711.81100
A1.001.502.000.800.710.831.172.201.291.002.003.501.671.331.001.333.173.002.291.201.002.002.671.401.500.750.801.501.5913.49
B1.402.001.200.200.000.331.000.400.291.001.501.751.672.001.712.331.672.003.001.801.332.601.332.602.632.632.401.831.5913.49
C1.600.251.201.200.141.501.831.802.142.003.252.003.835.176.294.333.333.711.714.004.332.403.002.402.633.252.601.502.6222.20
D1.202.252.001.201.862.672.001.201.292.002.252.253.333.174.004.672.503.573.292.605.174.003.003.002.251.503.402.002.6322.26
E1.000.250.400.400.430.330.170.000.000.400.250.250.170.000.290.000.170.570.430.801.671.801.331.601.381.250.200.170.564.75
F1.201.752.001.000.710.670.170.000.140.000.000.000.000.000.000.000.000.000.290.600.170.000.330.400.380.130.000.000.353.00
G1.801.751.201.001.290.500.500.000.000.000.001.000.670.330.000.000.671.001.000.600.670.601.000.400.630.501.401.170.705.95
H0.000.000.200.000.570.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.330.040.33
I2.603.253.602.603.293.002.334.003.863.001.500.250.170.500.141.001.001.002.711.600.831.200.330.201.000.881.001.171.7114.52
x2.403.503.201.000.711.172.172.601.572.003.505.253.333.332.713.674.835.005.293.002.334.604.004.004.133.383.203.333.1926.98
r0.600.250.400.000.000.330.330.201.000.001.250.000.330.170.861.330.830.711.140.800.670.400.000.400.630.630.200.670.504.27
s2.403.504.203.204.143.172.833.804.143.803.252.502.832.672.861.332.333.292.002.602.333.202.331.001.501.381.600.672.6722.64
a3.203.002.802.602.433.502.832.001.292.601.752.004.676.176.577.333.834.144.575.007.174.404.674.604.383.885.003.003.9133.08
h0.000.250.200.000.140.000.000.200.000.000.000.250.000.000.000.000.000.000.000.000.170.000.000.000.380.000.200.000.060.54
k3.202.503.001.601.571.671.000.801.001.001.001.000.330.170.430.000.671.711.711.802.502.002.002.001.381.631.602.001.4712.48
x3.604.755.803.404.573.833.506.205.144.003.503.751.831.831.142.334.174.005.002.801.833.203.001.602.501.631.803.003.3528.35
o5.606.255.403.203.294.834.832.802.864.406.256.508.8310.1711.4311.338.179.438.298.8011.178.807.337.607.757.009.005.837.0459.63
i1.401.251.801.600.861.000.830.600.861.001.000.750.830.500.860.000.171.431.291.201.502.002.002.802.132.131.000.831.2010.16
c1.200.750.800.200.290.170.000.000.140.000.000.000.000.000.000.000.000.000.140.400.670.600.670.000.000.130.000.000.221.86
CV241.20244.00263.40158.40181.00173.50125.00107.20112.00126.80124.50136.25136.50132.17158.43138.33126.83200.43188.43195.80279.50232.00212.67192.80179.00151.88186.40144.50173.18100
CVn37.6031.0037.0025.2064.2960.1751.6757.2058.1457.6077.0091.7575.1760.5071.1450.0021.3323.8627.5735.6079.0071.2049.3335.0030.6337.2557.4022.1749.8528.78
CVs203.60213.00226.40133.20116.71113.3373.3350.0053.8669.2047.5044.5061.3371.6787.2988.33105.50176.57160.86160.20200.50160.80163.33157.80148.38114.63129.00122.33123.3371.22