Statistics of sunspot activity
Solar activity in 1990
Visual indices of solar activity by author's observations
| | Average by |
monthIIIIII
IVVVI
VIIVIIIIX
XXIXIIdays| months | | | | | | | | | | | | | | |
| N | 5 | 10 | 11 | 14 | 17 | 8 | 14 | 5 | 2 | 1 | | | 8.70 | 8.70 |
| W | 131.60 | 81.80 | 130.55 | 150.00 | 125.53 | 114.00 | 146.29 | 327.00 | 132.50 | 233.00 | | | 140.68 | 157.23 |
| Wn | 57.40 | 40.00 | 38.00 | 77.50 | 61.53 | 50.63 | 76.86 | 114.00 | 55.50 | 111.00 | | | 63.32 | 68.24 |
| Ws | 74.20 | 41.80 | 92.55 | 72.50 | 64.00 | 63.37 | 69.43 | 213.00 | 77.00 | 122.00 | | | 77.36 | 88.98 |
| n | 7.60 | 5.20 | 6.82 | 7.71 | 6.41 | 6.50 | 7.64 | 15.00 | 8.50 | 12.00 | | | 7.41 | 8.34 |
| A | 0.20 | 0.80 | 0.45 | 0.43 | 0.59 | 0.38 | 1.00 | 1.40 | 0.00 | 1.00 | | | 0.63 | 0.63 |
| B | 1.80 | 0.50 | 1.00 | 1.93 | 1.24 | 0.88 | 0.79 | 3.20 | 2.50 | 2.00 | | | 1.31 | 1.58 |
| C | 2.00 | 1.10 | 1.45 | 1.57 | 1.35 | 1.50 | 1.50 | 3.40 | 1.50 | 1.00 | | | 1.56 | 1.64 |
| D | 0.80 | 0.90 | 1.09 | 1.29 | 0.76 | 1.62 | 1.50 | 2.00 | 1.00 | 1.00 | | | 1.18 | 1.20 |
| E | 0.40 | 0.40 | 0.45 | 0.50 | 0.76 | 0.50 | 0.71 | 1.60 | 0.00 | 0.00 | | | 0.61 | 0.53 |
| F | 0.60 | 0.10 | 0.27 | 0.71 | 0.24 | 0.12 | 0.07 | 0.80 | 0.00 | 0.00 | | | 0.31 | 0.29 |
| G | 0.60 | 0.10 | 0.45 | 0.00 | 0.41 | 0.50 | 0.50 | 1.00 | 0.00 | 2.00 | | | 0.39 | 0.56 |
| H | 0.40 | 0.40 | 0.55 | 0.36 | 0.41 | 0.88 | 0.50 | 1.40 | 3.50 | 2.00 | | | 0.62 | 1.04 |
| I | 0.80 | 0.90 | 1.09 | 0.93 | 0.65 | 0.12 | 1.07 | 0.20 | 0.00 | 3.00 | | | 0.79 | 0.88 |
| x | 2.00 | 1.30 | 1.45 | 2.36 | 1.82 | 1.25 | 1.79 | 4.60 | 2.50 | 3.00 | | | 1.94 | 2.21 |
| r | 0.20 | 0.30 | 0.09 | 0.14 | 0.41 | 0.25 | 0.29 | 0.80 | 0.50 | 2.00 | | | 0.31 | 0.50 |
| s | 2.40 | 1.30 | 2.18 | 2.14 | 2.12 | 2.50 | 2.21 | 4.20 | 4.00 | 4.00 | | | 2.29 | 2.71 |
| a | 2.00 | 1.10 | 1.82 | 2.07 | 1.18 | 1.75 | 2.50 | 1.00 | 1.00 | 0.00 | | | 1.68 | 1.44 |
| h | 0.40 | 0.70 | 0.09 | 0.21 | 0.00 | 0.00 | 0.14 | 1.80 | 0.00 | 1.00 | | | 0.29 | 0.43 |
| k | 0.60 | 0.50 | 1.18 | 0.79 | 0.88 | 0.75 | 0.71 | 2.60 | 0.50 | 2.00 | | | 0.91 | 1.05 |
| x | 1.40 | 2.10 | 2.09 | 1.71 | 1.65 | 1.38 | 2.57 | 3.00 | 3.50 | 6.00 | | | 2.05 | 2.54 |
| o | 3.80 | 1.60 | 2.82 | 3.07 | 2.88 | 3.88 | 3.29 | 7.40 | 4.50 | 3.00 | | | 3.26 | 3.62 |
| i | 2.40 | 1.50 | 1.64 | 2.71 | 1.65 | 1.00 | 1.71 | 3.60 | 0.50 | 3.00 | | | 1.90 | 1.97 |
| c | 0.00 | 0.00 | 0.27 | 0.21 | 0.24 | 0.25 | 0.07 | 1.00 | 0.00 | 0.00 | | | 0.21 | 0.20 |
| CV | 115.00 | 89.90 | 119.18 | 118.36 | 99.29 | 108.75 | 114.57 | 312.00 | 88.00 | 211.00 | | | 121.28 | 137.60 |
| CVn | 56.80 | 50.80 | 25.73 | 73.36 | 53.82 | 48.50 | 70.64 | 91.00 | 30.50 | 114.00 | | | 57.75 | 61.52 |
| CVs | 58.20 | 39.10 | 93.45 | 45.00 | 45.47 | 60.25 | 43.93 | 221.00 | 57.50 | 97.00 | | | 63.53 | 76.09 |
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