Statistics of sunspot activity
December, 1999
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 | 112.50 | 117.00 | 118.50 | 72.50 | 68.67 | 78.75 | 74.33 | 105.75 | 112.25 | 118.00 | 125.00 | 102.50 | 123.67 | 145.67 | 133.33 | 134.00 | 145.67 | 177.00 | 138.75 | 136.75 | 138.67 | 139.50 | 100.50 | 141.50 | 136.00 | 99.50 | 114.00 | 70.33 | 101.00 | 63.75 | 70.00 | 113.40 | 100 |
| Wn | 51.50 | 70.33 | 96.50 | 56.75 | 55.00 | 67.25 | 63.00 | 73.75 | 74.00 | 76.33 | 80.50 | 62.25 | 45.33 | 47.00 | 31.00 | 11.33 | 31.67 | 46.67 | 42.00 | 52.25 | 72.00 | 67.50 | 51.50 | 96.00 | 100.00 | 84.00 | 95.00 | 58.67 | 56.00 | 43.00 | 50.50 | 61.57 | 54.29 |
| Ws | 61.00 | 46.67 | 22.00 | 15.75 | 13.67 | 11.50 | 11.33 | 32.00 | 38.25 | 41.67 | 44.50 | 40.25 | 78.33 | 98.67 | 102.33 | 122.67 | 114.00 | 130.33 | 96.75 | 84.50 | 66.67 | 72.00 | 49.00 | 45.50 | 36.00 | 15.50 | 19.00 | 11.67 | 45.00 | 20.75 | 19.50 | 51.83 | 45.71 |
| n | 6.50 | 7.33 | 7.50 | 4.50 | 4.33 | 5.00 | 4.67 | 7.25 | 7.50 | 8.00 | 7.50 | 7.50 | 9.00 | 11.00 | 9.00 | 7.33 | 7.33 | 8.00 | 6.00 | 5.25 | 6.00 | 6.00 | 5.25 | 6.50 | 6.67 | 4.50 | 4.50 | 4.00 | 6.67 | 4.00 | 4.25 | 6.41 | 100 |
| A | 1.00 | 1.33 | 0.50 | 0.25 | 0.33 | 0.00 | 0.33 | 1.50 | 0.50 | 0.33 | 0.00 | 1.25 | 1.00 | 2.33 | 2.33 | 2.33 | 1.67 | 2.33 | 0.50 | 0.00 | 0.67 | 1.00 | 0.25 | 0.00 | 0.67 | 0.25 | 0.00 | 0.00 | 0.67 | 0.25 | 0.25 | 0.77 | 11.99 |
| B | 0.00 | 0.67 | 2.50 | 0.50 | 0.67 | 1.00 | 1.33 | 1.00 | 0.75 | 0.33 | 1.00 | 0.75 | 4.00 | 2.00 | 2.00 | 1.00 | 0.33 | 0.33 | 0.50 | 0.50 | 1.00 | 0.00 | 0.25 | 2.50 | 1.00 | 0.75 | 1.00 | 0.00 | 0.67 | 0.25 | 0.50 | 0.94 | 14.63 |
| C | 2.50 | 1.00 | 0.50 | 0.50 | 1.33 | 1.75 | 1.00 | 1.00 | 1.00 | 1.33 | 2.00 | 2.50 | 2.33 | 1.00 | 1.00 | 0.33 | 0.33 | 2.00 | 1.75 | 1.75 | 1.33 | 0.00 | 0.50 | 0.50 | 2.33 | 0.75 | 0.50 | 0.33 | 1.33 | 0.50 | 0.75 | 1.15 | 17.98 |
| D | 1.50 | 1.00 | 0.50 | 0.25 | 0.33 | 0.50 | 0.00 | 0.50 | 1.25 | 2.00 | 2.00 | 1.25 | 0.33 | 2.67 | 2.33 | 2.67 | 2.67 | 1.00 | 1.25 | 0.75 | 0.33 | 2.50 | 1.75 | 0.50 | 0.67 | 0.25 | 0.50 | 0.67 | 0.33 | 0.75 | 0.75 | 1.09 | 16.97 |
| E | 1.00 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.67 | 1.00 | 1.00 | 1.00 | 0.50 | 0.25 | 0.00 | 0.33 | 0.25 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.24 | 3.69 |
| F | 0.00 | 0.33 | 0.50 | 0.50 | 0.00 | 0.25 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.67 | 0.75 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.67 | 0.00 | 0.00 | 0.00 | 0.39 | 6.04 |
| G | 0.00 | 0.33 | 1.50 | 0.50 | 1.00 | 0.75 | 0.67 | 1.00 | 1.25 | 1.00 | 1.00 | 1.00 | 1.00 | 0.67 | 0.00 | 0.00 | 0.33 | 0.33 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.33 | 0.75 | 1.00 | 1.33 | 1.67 | 1.00 | 1.00 | 0.65 | 10.14 |
| H | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.67 | 0.00 | 0.00 | 0.25 | 0.67 | 0.50 | 1.00 | 1.00 | 0.33 | 0.50 | 0.00 | 0.00 | 0.00 | 0.25 | 0.25 | 0.19 | 2.89 |
| I | 0.50 | 1.67 | 1.50 | 2.00 | 0.67 | 0.75 | 1.00 | 2.25 | 2.75 | 3.00 | 1.50 | 0.75 | 0.33 | 2.33 | 1.33 | 1.00 | 1.00 | 0.67 | 0.00 | 0.00 | 0.00 | 0.50 | 0.25 | 0.50 | 0.00 | 0.00 | 0.50 | 1.00 | 1.67 | 1.00 | 0.75 | 1.01 | 15.67 |
| x | 1.00 | 2.00 | 3.00 | 0.75 | 1.00 | 1.00 | 1.67 | 2.50 | 1.25 | 0.67 | 1.00 | 2.00 | 5.00 | 4.33 | 4.33 | 3.33 | 2.00 | 2.67 | 1.00 | 0.50 | 1.67 | 1.00 | 0.50 | 2.50 | 1.67 | 1.00 | 1.00 | 0.00 | 1.33 | 0.50 | 0.75 | 1.71 | 26.61 |
| r | 1.50 | 1.00 | 0.50 | 0.25 | 0.00 | 0.75 | 1.00 | 0.25 | 1.25 | 0.33 | 0.50 | 0.50 | 0.67 | 0.67 | 0.33 | 0.33 | 0.00 | 0.67 | 0.50 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 1.33 | 0.50 | 0.50 | 0.45 | 7.04 |
| s | 0.50 | 1.33 | 1.50 | 1.50 | 1.67 | 1.25 | 0.67 | 2.25 | 3.25 | 3.33 | 2.00 | 2.50 | 1.33 | 1.33 | 2.00 | 2.00 | 1.67 | 0.67 | 0.75 | 0.75 | 0.67 | 1.50 | 0.50 | 0.50 | 1.33 | 1.00 | 1.00 | 1.00 | 2.00 | 0.25 | 1.00 | 1.39 | 21.63 |
| a | 3.00 | 2.33 | 1.50 | 1.00 | 0.67 | 1.00 | 0.33 | 1.25 | 0.50 | 2.67 | 3.00 | 1.50 | 1.00 | 4.00 | 1.67 | 0.67 | 1.33 | 1.33 | 0.75 | 1.25 | 0.33 | 1.50 | 1.25 | 1.50 | 1.67 | 0.25 | 0.50 | 1.00 | 0.67 | 2.50 | 1.75 | 1.41 | 21.96 |
| h | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.25 | 0.33 | 0.50 | 0.50 | 1.00 | 0.67 | 0.00 | 0.00 | 0.67 | 1.00 | 0.75 | 1.25 | 1.67 | 1.00 | 1.25 | 1.50 | 0.33 | 0.75 | 0.50 | 0.67 | 0.33 | 0.00 | 0.00 | 0.50 | 7.75 |
| k | 0.50 | 0.67 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.50 | 1.00 | 0.67 | 0.50 | 0.50 | 0.00 | 0.00 | 0.67 | 1.00 | 1.67 | 1.67 | 2.25 | 1.50 | 1.33 | 1.00 | 1.75 | 0.50 | 1.33 | 1.50 | 1.50 | 1.33 | 1.00 | 0.25 | 0.25 | 0.96 | 15.00 |
| x | 1.50 | 3.33 | 2.00 | 2.25 | 1.00 | 0.75 | 1.33 | 3.75 | 3.25 | 3.33 | 1.50 | 2.00 | 1.33 | 4.67 | 3.67 | 3.33 | 3.33 | 3.00 | 0.50 | 0.25 | 1.33 | 2.00 | 1.50 | 1.50 | 1.00 | 0.75 | 0.50 | 1.00 | 2.33 | 1.50 | 1.25 | 1.96 | 30.55 |
| o | 3.00 | 2.67 | 5.00 | 1.75 | 3.33 | 4.00 | 3.00 | 3.50 | 4.00 | 4.33 | 6.00 | 5.50 | 7.67 | 5.33 | 4.33 | 3.00 | 3.00 | 3.33 | 3.75 | 3.00 | 2.67 | 2.00 | 2.50 | 3.50 | 4.33 | 2.50 | 3.00 | 2.33 | 4.00 | 2.50 | 3.00 | 3.61 | 56.24 |
| i | 2.00 | 1.33 | 0.50 | 0.50 | 0.00 | 0.25 | 0.33 | 0.00 | 0.25 | 0.33 | 0.00 | 0.00 | 0.00 | 1.00 | 0.33 | 0.67 | 0.33 | 1.33 | 0.75 | 1.25 | 0.67 | 1.00 | 0.50 | 0.50 | 0.33 | 0.25 | 0.00 | 0.67 | 0.33 | 0.00 | 0.00 | 0.50 | 7.75 |
| c | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.67 | 0.33 | 0.67 | 0.33 | 1.00 | 0.75 | 1.33 | 1.00 | 0.75 | 1.00 | 1.00 | 1.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.35 | 5.45 |
| CV | 88.00 | 94.67 | 100.00 | 74.25 | 74.33 | 79.50 | 63.00 | 90.00 | 118.00 | 129.67 | 119.00 | 107.25 | 89.33 | 120.33 | 101.00 | 102.67 | 161.00 | 158.00 | 175.50 | 164.25 | 169.33 | 163.00 | 170.25 | 133.50 | 133.67 | 136.25 | 125.00 | 122.00 | 107.33 | 55.50 | 59.00 | 115.63 | 100 |
| CVn | 40.50 | 58.33 | 65.50 | 62.50 | 65.67 | 72.00 | 60.67 | 75.25 | 96.00 | 89.00 | 83.50 | 72.25 | 61.67 | 44.67 | 11.33 | 4.00 | 48.33 | 57.67 | 62.00 | 63.50 | 72.00 | 81.00 | 68.25 | 76.50 | 92.67 | 104.50 | 113.50 | 114.00 | 84.00 | 38.50 | 46.75 | 67.29 | 58.19 |
| CVs | 47.50 | 36.33 | 34.50 | 11.75 | 8.67 | 7.50 | 2.33 | 14.75 | 22.00 | 40.67 | 35.50 | 35.00 | 27.67 | 75.67 | 89.67 | 98.67 | 112.67 | 100.33 | 113.50 | 100.75 | 97.33 | 82.00 | 102.00 | 57.00 | 41.00 | 31.75 | 11.50 | 8.00 | 23.33 | 17.00 | 12.25 | 48.34 | 41.81 |
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