The Sunspot Observer - Average annual indices of solar activity NGDC - April, 1990

Statistics of sunspot activity

April, 1990

Visual indices of solar activity by National Geophysical Data Center

Date123456789101112131415161718192021222324252627282930Average%
W133.83145.50142.33168.83175.75214.75167.43115.67120.2098.25112.50124.33137.67155.83214.50234.00296.00296.25265.50311.75261.00258.20234.14201.40211.40190.60183.20116.00126.40115.00184.27100
Wn56.6775.1769.3396.50100.25127.7597.7175.0078.0073.2571.5071.6780.5084.00103.75108.40129.00121.25113.00132.00109.67118.20110.0099.00108.8092.0090.2064.8362.4053.0092.4350.16
Ws77.1770.3373.0072.3375.5087.0069.7140.6742.2025.0041.0052.6757.1771.83110.75125.60167.00175.00152.50179.75151.33140.00124.14102.40102.6098.6093.0051.1764.0062.0091.8549.84
n8.178.839.179.509.7513.0010.437.338.407.508.008.677.507.1710.0010.4011.5011.009.7512.0012.5012.2011.8611.8012.4012.4011.007.008.608.679.88100
A0.330.331.170.330.251.501.571.171.201.252.751.330.670.670.753.001.751.500.502.751.001.800.860.801.401.001.000.000.801.171.1511.67
B0.831.501.171.502.001.253.141.171.801.251.252.330.500.502.002.602.253.253.001.501.501.202.001.201.802.201.401.502.201.501.7117.30
C1.001.501.501.501.502.751.430.831.002.001.252.000.671.831.750.602.500.501.501.752.333.403.294.604.004.001.401.332.002.831.9519.75
D3.002.171.832.331.752.251.291.331.200.751.001.003.001.672.000.800.752.250.752.003.002.803.864.004.203.204.202.332.600.832.1421.63
E0.330.500.670.831.001.250.290.000.000.000.000.000.000.500.751.000.750.250.750.250.500.400.430.200.200.200.000.000.000.000.373.73
F0.000.000.000.000.000.000.000.000.000.000.000.000.500.330.750.601.001.500.501.000.670.600.140.000.000.000.000.000.000.000.252.56
G0.330.500.330.170.000.000.711.001.200.500.250.001.171.000.500.401.001.252.002.002.001.800.290.200.000.000.400.670.200.670.686.93
H0.000.000.000.000.000.000.140.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.140.000.000.000.000.170.000.000.020.15
I2.332.332.502.833.254.001.861.832.001.751.502.001.000.671.501.401.500.500.750.751.500.200.860.800.801.802.601.000.801.671.6116.28
x1.171.832.331.832.252.754.712.333.002.504.003.671.171.172.755.604.004.753.504.252.503.002.862.003.203.202.401.503.002.672.8628.97
r0.170.331.000.670.501.500.290.000.200.750.000.670.500.000.750.001.750.000.000.250.000.200.140.400.200.600.200.170.400.670.414.15
s4.003.503.503.672.753.502.861.832.402.252.002.001.832.002.251.200.750.750.501.002.501.002.141.402.201.601.001.501.402.332.0520.78
a2.332.171.332.333.004.001.712.672.001.002.002.333.173.003.252.604.004.254.504.505.676.005.006.206.006.607.403.503.803.003.6436.87
h0.330.330.330.170.250.500.290.170.400.500.000.000.000.170.000.000.000.000.000.000.330.400.140.000.000.000.000.330.000.000.151.57
k0.170.670.670.831.000.750.570.330.400.500.000.000.830.831.001.001.001.251.252.001.501.601.571.800.800.400.000.000.000.000.767.67
x2.672.673.673.173.505.503.573.003.203.004.253.331.671.332.254.403.252.001.253.502.502.001.861.602.202.803.601.171.602.832.7828.11
o5.005.674.835.504.756.256.574.175.204.503.505.005.004.675.753.806.257.007.257.008.177.607.438.409.208.407.005.837.005.836.0861.56
i0.500.500.670.831.501.250.290.170.000.000.250.330.831.002.002.202.002.001.251.001.832.602.291.601.001.200.400.000.000.000.989.95
c0.000.000.000.000.000.000.000.000.000.000.000.000.000.170.000.000.000.000.000.500.000.000.290.200.000.000.000.000.000.000.040.39
CV128.17133.33124.83139.00135.75167.50111.5789.00103.0090.0056.5061.00133.00128.83143.75112.20134.50160.50140.75193.50220.00204.80193.86186.00154.60131.20125.8095.5082.0073.67131.80100
CVn63.0069.8365.1788.83101.00119.2586.7163.3374.8069.0044.0041.3390.8385.8384.2570.6081.0083.0069.5077.50111.5099.00104.5795.8096.0072.6066.2050.1743.2032.5076.6858.18
CVs65.1763.5059.6750.1734.7548.2524.8625.6728.2021.0012.5019.6742.1743.0059.5041.6053.5077.5071.25116.00108.50105.8089.2990.2058.6058.6059.6045.3338.8041.1755.1341.82