Statistics of sunspot activity
December, 1990
Visual indices of solar activity by National Geophysical Data Center
| Date | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | Average | % |
| W | 191.60 | 223.80 | 249.67 | 261.33 | 219.17 | 244.33 | 275.14 | 261.00 | 263.67 | 221.50 | 222.33 | 187.14 | 168.00 | 129.67 | 119.00 | 134.83 | 153.20 | 128.71 | 174.50 | 178.80 | 158.80 | 143.20 | 126.00 | 118.20 | 182.25 | 142.00 | 169.80 | 150.00 | 167.80 | 171.83 | 164.86 | 183.94 | 100 |
| Wn | 85.20 | 111.60 | 124.50 | 125.00 | 107.17 | 137.50 | 149.86 | 140.29 | 155.50 | 139.33 | 157.00 | 157.57 | 142.00 | 118.33 | 116.25 | 127.83 | 132.00 | 109.43 | 144.50 | 137.60 | 126.00 | 89.00 | 55.50 | 37.20 | 31.25 | 22.25 | 12.20 | 23.00 | 23.00 | 25.50 | 22.29 | 99.54 | 54.11 |
| Ws | 106.40 | 112.20 | 125.17 | 136.33 | 112.00 | 106.83 | 125.29 | 120.71 | 108.17 | 82.17 | 65.33 | 29.57 | 26.00 | 11.33 | 2.75 | 7.00 | 21.20 | 19.29 | 30.00 | 41.20 | 32.80 | 54.20 | 70.50 | 81.00 | 151.00 | 119.75 | 157.60 | 127.00 | 144.80 | 146.33 | 142.57 | 84.40 | 45.89 |
| n | 13.80 | 15.60 | 16.50 | 16.67 | 12.33 | 13.50 | 12.71 | 11.29 | 13.17 | 11.83 | 12.33 | 10.57 | 9.50 | 6.00 | 4.25 | 5.33 | 5.60 | 3.86 | 5.33 | 6.80 | 7.00 | 6.40 | 7.00 | 6.80 | 9.00 | 6.50 | 6.80 | 7.80 | 8.40 | 9.17 | 9.00 | 9.38 | 100 |
| A | 1.60 | 3.80 | 1.33 | 3.17 | 3.17 | 2.83 | 2.29 | 1.43 | 2.50 | 1.17 | 1.00 | 0.14 | 0.50 | 0.50 | 0.25 | 0.50 | 0.80 | 0.14 | 0.50 | 2.00 | 2.00 | 1.40 | 2.00 | 0.60 | 1.75 | 0.00 | 1.00 | 1.60 | 1.80 | 1.67 | 0.71 | 1.42 | 15.18 |
| B | 3.20 | 2.60 | 3.50 | 2.50 | 1.17 | 2.83 | 3.29 | 2.00 | 1.67 | 1.67 | 1.33 | 0.71 | 1.75 | 0.50 | 0.00 | 0.33 | 0.20 | 0.00 | 1.17 | 0.80 | 0.20 | 0.60 | 0.75 | 0.60 | 0.50 | 0.25 | 0.60 | 1.40 | 1.20 | 1.83 | 2.00 | 1.33 | 14.15 |
| C | 3.60 | 3.00 | 4.67 | 4.00 | 2.00 | 2.17 | 1.43 | 1.57 | 1.67 | 2.17 | 3.50 | 3.29 | 1.50 | 1.00 | 0.50 | 1.17 | 0.40 | 0.29 | 0.33 | 1.20 | 0.60 | 0.80 | 0.50 | 0.80 | 1.00 | 0.75 | 1.60 | 1.20 | 2.20 | 2.67 | 2.00 | 1.73 | 18.41 |
| D | 1.80 | 2.60 | 3.33 | 3.17 | 1.83 | 2.50 | 2.86 | 3.71 | 5.67 | 4.67 | 4.17 | 2.29 | 1.00 | 0.33 | 0.00 | 0.67 | 1.80 | 1.57 | 1.33 | 0.60 | 1.60 | 0.60 | 1.50 | 3.00 | 4.50 | 4.25 | 1.40 | 1.60 | 0.00 | 0.17 | 2.43 | 2.16 | 23.02 |
| E | 0.00 | 0.20 | 0.00 | 0.17 | 0.50 | 0.50 | 1.14 | 1.14 | 0.17 | 0.17 | 0.00 | 0.29 | 0.75 | 0.50 | 0.25 | 0.17 | 0.00 | 0.00 | 0.17 | 0.20 | 0.20 | 0.20 | 0.00 | 0.20 | 0.25 | 0.00 | 0.40 | 0.00 | 0.60 | 0.50 | 0.14 | 0.28 | 3.02 |
| F | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.67 | 0.40 | 0.43 | 0.50 | 1.00 | 1.00 | 0.60 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.19 | 2.04 |
| G | 0.40 | 0.40 | 0.50 | 0.67 | 1.00 | 0.83 | 0.29 | 0.57 | 1.17 | 0.83 | 1.33 | 0.71 | 1.00 | 0.83 | 1.75 | 1.17 | 1.40 | 1.43 | 1.33 | 0.20 | 0.40 | 1.40 | 1.50 | 0.80 | 1.00 | 0.50 | 1.60 | 1.20 | 1.40 | 1.67 | 0.71 | 0.97 | 10.31 |
| H | 0.00 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.71 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.05 | 0.58 |
| I | 3.20 | 2.60 | 3.17 | 3.00 | 2.67 | 1.67 | 1.29 | 0.86 | 0.33 | 1.00 | 1.00 | 2.43 | 3.00 | 2.00 | 1.50 | 0.67 | 0.60 | 0.00 | 0.00 | 0.80 | 1.00 | 0.80 | 0.25 | 0.40 | 0.00 | 0.75 | 0.20 | 0.80 | 1.00 | 0.67 | 1.00 | 1.25 | 13.28 |
| x | 4.80 | 6.40 | 4.83 | 5.67 | 4.33 | 5.67 | 5.57 | 3.43 | 4.17 | 2.83 | 2.33 | 0.86 | 2.25 | 1.00 | 0.25 | 0.83 | 1.00 | 0.14 | 1.67 | 2.80 | 2.20 | 2.00 | 2.75 | 1.20 | 2.25 | 0.25 | 1.60 | 3.00 | 3.00 | 3.50 | 2.71 | 2.75 | 29.33 |
| r | 1.60 | 1.20 | 1.67 | 0.50 | 0.83 | 0.33 | 0.43 | 0.00 | 0.50 | 0.17 | 0.33 | 0.43 | 0.25 | 0.00 | 0.50 | 1.00 | 0.40 | 0.14 | 0.00 | 0.60 | 0.20 | 0.00 | 0.50 | 0.00 | 0.25 | 0.00 | 0.00 | 0.40 | 0.40 | 0.33 | 0.71 | 0.44 | 4.70 |
| s | 5.00 | 2.60 | 4.33 | 3.67 | 3.33 | 2.33 | 2.57 | 2.14 | 0.50 | 1.33 | 2.00 | 1.71 | 2.00 | 0.67 | 0.75 | 0.33 | 0.60 | 0.00 | 0.17 | 0.80 | 1.40 | 1.00 | 0.25 | 0.40 | 1.75 | 1.75 | 2.00 | 1.60 | 2.20 | 2.17 | 1.57 | 1.71 | 18.20 |
| a | 1.80 | 4.40 | 4.50 | 5.67 | 3.00 | 4.17 | 3.00 | 4.43 | 6.17 | 5.50 | 4.67 | 4.43 | 2.25 | 2.00 | 0.75 | 1.33 | 1.60 | 1.86 | 1.83 | 1.00 | 1.60 | 1.80 | 1.25 | 4.00 | 3.75 | 3.75 | 3.00 | 2.80 | 2.40 | 2.50 | 3.71 | 3.06 | 32.63 |
| h | 0.00 | 0.60 | 0.33 | 0.17 | 0.17 | 0.33 | 0.29 | 0.00 | 0.00 | 0.17 | 0.33 | 0.29 | 0.00 | 0.33 | 0.00 | 0.17 | 0.20 | 0.29 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.40 | 0.50 | 0.25 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.17 | 1.80 |
| k | 0.60 | 0.40 | 0.83 | 1.00 | 0.67 | 0.67 | 0.86 | 1.29 | 1.83 | 1.83 | 2.67 | 2.86 | 2.75 | 2.00 | 2.00 | 1.67 | 1.80 | 1.43 | 1.67 | 1.60 | 1.60 | 1.60 | 2.00 | 0.80 | 0.50 | 0.50 | 0.20 | 0.00 | 0.40 | 0.50 | 0.29 | 1.25 | 13.34 |
| x | 4.80 | 6.80 | 4.50 | 6.17 | 5.83 | 4.50 | 3.57 | 2.29 | 2.83 | 2.33 | 2.00 | 3.29 | 3.50 | 2.50 | 1.75 | 1.17 | 1.40 | 0.14 | 0.50 | 2.80 | 3.00 | 2.20 | 2.25 | 1.40 | 1.75 | 0.75 | 1.20 | 2.40 | 2.80 | 2.33 | 1.71 | 2.72 | 29.04 |
| o | 9.00 | 8.40 | 11.83 | 10.00 | 5.17 | 8.00 | 7.00 | 7.00 | 8.67 | 7.33 | 9.33 | 6.14 | 5.00 | 2.67 | 2.25 | 3.33 | 3.20 | 2.14 | 3.33 | 2.40 | 2.80 | 3.40 | 4.25 | 4.80 | 6.75 | 5.50 | 5.00 | 5.20 | 4.80 | 6.33 | 7.14 | 5.75 | 61.26 |
| i | 0.00 | 0.40 | 0.17 | 0.50 | 1.17 | 1.00 | 2.14 | 2.00 | 1.67 | 2.00 | 0.83 | 1.14 | 1.00 | 0.83 | 0.25 | 0.83 | 0.80 | 1.14 | 0.83 | 1.60 | 1.20 | 0.80 | 0.25 | 0.60 | 0.50 | 0.25 | 0.60 | 0.20 | 0.80 | 0.50 | 0.14 | 0.84 | 8.99 |
| c | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.43 | 0.67 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.07 | 0.70 |
| CV | 130.60 | 150.00 | 182.67 | 181.67 | 140.67 | 152.67 | 159.71 | 175.43 | 206.50 | 201.83 | 232.67 | 205.57 | 169.25 | 128.67 | 105.00 | 113.17 | 135.00 | 121.29 | 122.83 | 103.20 | 125.40 | 116.20 | 139.25 | 127.60 | 159.25 | 130.50 | 98.60 | 78.80 | 94.20 | 104.33 | 101.86 | 141.75 | 100 |
| CVn | 69.60 | 87.60 | 117.00 | 106.17 | 54.83 | 64.33 | 82.71 | 88.86 | 132.67 | 143.00 | 191.17 | 187.14 | 159.25 | 123.00 | 102.50 | 108.00 | 117.00 | 106.43 | 106.33 | 91.40 | 97.80 | 72.40 | 57.50 | 50.20 | 32.50 | 26.50 | 3.40 | 6.20 | 8.40 | 10.50 | 12.71 | 84.42 | 59.56 |
| CVs | 61.00 | 62.40 | 65.67 | 75.50 | 85.83 | 88.33 | 77.00 | 86.57 | 73.83 | 58.83 | 41.50 | 18.43 | 10.00 | 5.67 | 2.50 | 5.17 | 18.00 | 14.86 | 16.50 | 11.80 | 27.60 | 43.80 | 81.75 | 77.40 | 126.75 | 104.00 | 95.20 | 72.60 | 85.80 | 93.83 | 89.14 | 57.33 | 40.44 |
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