Statistics of sunspot activity
Solar activity in 1998
Visual indices of solar activity by National Geophysical Data Center
  | Average by |
monthIIIIII
IVVVI
VIIVIIIIX
XXIXIIdaysmonths | | | | | | | | | | | | | | |
N | 31 | 28 | 31 | 30 | 24 | 30 | 31 | 31 | 30 | 31 | 24 | 31 | 29.33 | 29.33 |
W | 48.09 | 50.14 | 73.91 | 68.63 | 75.11 | 85.28 | 89.23 | 106.97 | 110.87 | 71.34 | 99.82 | 113.17 | 82.76 | 82.71 |
Wn | 18.90 | 15.18 | 15.31 | 14.08 | 31.35 | 39.83 | 38.23 | 68.33 | 56.62 | 43.37 | 57.25 | 68.62 | 38.93 | 38.92 |
Ws | 29.19 | 34.96 | 58.61 | 54.56 | 43.75 | 45.45 | 51.00 | 38.64 | 54.25 | 27.97 | 42.56 | 44.55 | 43.83 | 43.79 |
n | 3.12 | 3.37 | 4.03 | 4.23 | 3.30 | 5.48 | 5.87 | 6.34 | 6.44 | 4.41 | 5.42 | 6.30 | 4.88 | 4.86 |
A | 0.81 | 0.72 | 0.67 | 0.75 | 0.55 | 0.55 | 1.01 | 0.78 | 0.55 | 0.77 | 0.63 | 0.68 | 0.71 | 0.71 |
B | 1.10 | 1.05 | 0.71 | 0.90 | 0.29 | 1.31 | 1.11 | 0.88 | 0.71 | 1.01 | 0.66 | 0.71 | 0.88 | 0.87 |
C | 0.45 | 0.48 | 0.73 | 0.96 | 0.45 | 1.44 | 1.52 | 1.35 | 1.63 | 0.82 | 1.57 | 1.28 | 1.06 | 1.06 |
D | 0.40 | 0.38 | 0.55 | 0.79 | 0.52 | 0.84 | 0.87 | 0.86 | 1.24 | 1.09 | 0.51 | 1.18 | 0.78 | 0.77 |
E | 0.07 | 0.18 | 0.31 | 0.06 | 0.51 | 0.04 | 0.05 | 0.12 | 0.27 | 0.07 | 0.20 | 0.50 | 0.19 | 0.20 |
F | 0.09 | 0.00 | 0.31 | 0.02 | 0.20 | 0.02 | 0.00 | 0.27 | 0.18 | 0.00 | 0.18 | 0.11 | 0.12 | 0.12 |
G | 0.08 | 0.08 | 0.14 | 0.39 | 0.29 | 0.11 | 0.11 | 0.59 | 0.51 | 0.27 | 0.54 | 0.68 | 0.31 | 0.32 |
H | 0.00 | 0.01 | 0.04 | 0.02 | 0.01 | 0.16 | 0.12 | 0.15 | 0.03 | 0.03 | 0.12 | 0.05 | 0.07 | 0.06 |
I | 0.11 | 0.47 | 0.57 | 0.34 | 0.48 | 1.01 | 1.07 | 1.32 | 1.31 | 0.36 | 1.02 | 1.10 | 0.76 | 0.76 |
x | 1.91 | 1.78 | 1.38 | 1.65 | 0.84 | 1.86 | 2.12 | 1.67 | 1.26 | 1.78 | 1.28 | 1.39 | 1.60 | 1.58 |
r | 0.14 | 0.27 | 0.25 | 0.21 | 0.09 | 0.34 | 0.58 | 0.26 | 0.32 | 0.30 | 0.16 | 0.31 | 0.27 | 0.27 |
s | 0.52 | 0.79 | 1.15 | 1.42 | 1.09 | 1.85 | 1.59 | 2.02 | 2.71 | 1.24 | 2.02 | 2.63 | 1.59 | 1.59 |
a | 0.43 | 0.24 | 0.61 | 0.60 | 0.75 | 0.87 | 0.98 | 1.21 | 1.38 | 0.82 | 1.19 | 1.58 | 0.89 | 0.89 |
h | 0.05 | 0.10 | 0.14 | 0.16 | 0.12 | 0.34 | 0.31 | 0.22 | 0.10 | 0.10 | 0.27 | 0.13 | 0.17 | 0.17 |
k | 0.06 | 0.20 | 0.49 | 0.19 | 0.42 | 0.22 | 0.28 | 0.96 | 0.66 | 0.18 | 0.49 | 0.25 | 0.37 | 0.37 |
x | 0.92 | 1.21 | 1.28 | 1.11 | 1.05 | 1.73 | 2.20 | 2.26 | 1.89 | 1.17 | 1.77 | 1.84 | 1.55 | 1.53 |
o | 1.91 | 1.92 | 2.02 | 2.86 | 1.26 | 3.50 | 3.37 | 3.45 | 3.87 | 2.89 | 3.12 | 3.66 | 2.85 | 2.82 |
i | 0.26 | 0.22 | 0.43 | 0.19 | 0.68 | 0.17 | 0.19 | 0.27 | 0.40 | 0.19 | 0.32 | 0.60 | 0.32 | 0.33 |
c | 0.03 | 0.02 | 0.31 | 0.08 | 0.32 | 0.08 | 0.10 | 0.35 | 0.28 | 0.17 | 0.20 | 0.21 | 0.18 | 0.18 |
CV | 26.35 | 33.07 | 63.19 | 54.45 | 62.52 | 66.67 | 65.45 | 104.80 | 101.01 | 53.77 | 82.51 | 93.50 | 67.30 | 67.27 |
CVn | 5.93 | 5.85 | 8.28 | 6.66 | 25.49 | 24.66 | 23.80 | 67.84 | 54.54 | 31.80 | 45.98 | 57.23 | 29.82 | 29.84 |
CVs | 20.43 | 27.23 | 54.91 | 47.79 | 37.03 | 42.01 | 41.65 | 36.95 | 46.46 | 21.98 | 36.52 | 36.27 | 37.48 | 37.44 |
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