Statistics of sunspot activity
December, 1998
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 | 135.50 | 136.00 | 129.50 | 108.33 | 88.00 | 98.50 | 129.50 | 156.00 | 121.33 | 141.00 | 155.25 | 140.33 | 140.00 | 114.75 | 107.00 | 116.00 | 73.00 | 79.00 | 79.00 | 76.25 | 66.33 | 53.50 | 65.67 | 83.33 | 84.00 | 92.50 | 141.25 | 167.50 | 132.25 | 169.67 | 128.00 | 113.17 | 100 |
| Wn | 107.25 | 115.50 | 118.00 | 93.67 | 76.50 | 67.00 | 72.50 | 69.00 | 43.33 | 38.75 | 38.00 | 33.33 | 27.75 | 18.00 | 20.75 | 28.00 | 26.00 | 37.00 | 47.33 | 57.75 | 59.00 | 50.75 | 65.67 | 74.67 | 69.67 | 75.25 | 115.50 | 130.00 | 108.50 | 132.33 | 110.50 | 68.62 | 60.64 |
| Ws | 28.25 | 20.50 | 11.50 | 14.67 | 11.50 | 31.50 | 57.00 | 87.00 | 78.00 | 102.25 | 117.25 | 107.00 | 112.25 | 96.75 | 86.25 | 88.00 | 47.00 | 42.00 | 31.67 | 18.50 | 7.33 | 2.75 | 0.00 | 8.67 | 14.33 | 17.25 | 25.75 | 37.50 | 23.75 | 37.33 | 17.50 | 44.55 | 39.36 |
| n | 6.75 | 7.00 | 8.00 | 7.00 | 6.50 | 6.50 | 8.00 | 9.00 | 7.33 | 8.00 | 10.00 | 8.00 | 8.25 | 6.25 | 7.00 | 7.00 | 4.50 | 4.25 | 4.33 | 5.25 | 4.00 | 3.00 | 4.33 | 5.67 | 5.00 | 5.50 | 6.00 | 6.00 | 4.75 | 6.67 | 5.50 | 6.30 | 100 |
| A | 0.75 | 0.50 | 2.50 | 0.67 | 0.50 | 0.00 | 0.50 | 0.67 | 0.00 | 0.00 | 1.00 | 0.00 | 1.00 | 0.50 | 1.50 | 1.33 | 0.25 | 0.25 | 0.33 | 1.00 | 1.00 | 0.75 | 1.00 | 1.00 | 0.67 | 0.50 | 0.25 | 0.00 | 0.25 | 1.00 | 1.50 | 0.68 | 10.84 |
| B | 0.75 | 1.00 | 1.00 | 1.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.50 | 2.25 | 1.00 | 1.00 | 0.25 | 1.25 | 1.00 | 0.50 | 0.00 | 0.33 | 0.75 | 0.33 | 0.25 | 1.00 | 1.00 | 0.67 | 0.75 | 1.50 | 1.00 | 0.00 | 0.33 | 0.50 | 0.71 | 11.22 |
| C | 1.75 | 2.00 | 1.00 | 2.33 | 0.50 | 2.50 | 2.50 | 3.00 | 2.00 | 1.75 | 1.00 | 0.67 | 1.50 | 1.25 | 0.50 | 1.33 | 0.75 | 0.50 | 1.00 | 0.75 | 0.00 | 0.50 | 0.67 | 1.33 | 1.00 | 0.75 | 1.00 | 1.50 | 1.25 | 1.67 | 1.50 | 1.28 | 20.35 |
| D | 0.75 | 0.50 | 0.00 | 0.00 | 0.50 | 2.00 | 2.00 | 3.00 | 2.00 | 1.50 | 0.75 | 1.67 | 1.25 | 1.50 | 1.00 | 1.00 | 1.25 | 1.25 | 0.33 | 0.25 | 0.33 | 0.75 | 1.00 | 1.33 | 2.33 | 3.25 | 2.25 | 2.00 | 0.75 | 0.00 | 0.00 | 1.18 | 18.69 |
| E | 0.00 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.50 | 0.75 | 0.33 | 0.25 | 1.00 | 1.00 | 1.00 | 0.25 | 1.00 | 1.33 | 1.25 | 0.33 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 1.00 | 1.50 | 1.67 | 0.50 | 0.50 | 7.94 |
| F | 0.75 | 0.50 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.50 | 0.11 | 1.79 |
| G | 2.00 | 2.00 | 1.50 | 1.67 | 1.50 | 0.50 | 0.50 | 0.67 | 1.33 | 1.25 | 1.25 | 0.67 | 0.75 | 0.25 | 0.00 | 0.00 | 0.25 | 0.75 | 0.67 | 0.25 | 1.33 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.33 | 1.00 | 0.68 | 10.84 |
| H | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.50 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.05 | 0.81 |
| I | 0.00 | 0.00 | 1.00 | 1.33 | 2.00 | 1.00 | 2.50 | 1.67 | 1.67 | 1.00 | 3.00 | 3.67 | 2.50 | 1.50 | 1.75 | 1.33 | 1.00 | 0.50 | 0.33 | 1.00 | 0.67 | 0.00 | 0.33 | 1.00 | 0.33 | 0.25 | 0.25 | 0.25 | 0.75 | 1.67 | 0.00 | 1.10 | 17.53 |
| x | 1.50 | 1.50 | 3.50 | 1.67 | 1.50 | 0.00 | 0.50 | 0.67 | 0.00 | 1.50 | 3.25 | 1.00 | 2.00 | 0.75 | 2.75 | 2.33 | 0.75 | 0.25 | 0.67 | 1.75 | 1.33 | 1.00 | 2.00 | 2.00 | 1.33 | 1.25 | 1.75 | 1.00 | 0.25 | 1.33 | 2.00 | 1.39 | 22.06 |
| r | 0.00 | 0.00 | 0.50 | 0.67 | 0.00 | 0.50 | 0.00 | 0.00 | 1.33 | 0.00 | 0.00 | 0.00 | 0.50 | 1.00 | 0.25 | 1.00 | 0.25 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.33 | 0.67 | 0.00 | 0.00 | 0.25 | 0.25 | 0.00 | 1.33 | 0.50 | 0.31 | 4.95 |
| s | 1.25 | 1.00 | 2.00 | 2.67 | 2.00 | 3.50 | 4.00 | 5.67 | 3.67 | 4.50 | 5.00 | 5.00 | 4.75 | 3.75 | 3.25 | 3.00 | 2.25 | 2.00 | 2.00 | 2.25 | 0.67 | 0.75 | 1.33 | 1.67 | 2.67 | 2.50 | 1.75 | 1.75 | 2.25 | 1.67 | 1.00 | 2.63 | 41.72 |
| a | 2.50 | 4.50 | 1.50 | 0.67 | 1.50 | 1.50 | 3.00 | 2.67 | 1.67 | 1.25 | 1.00 | 2.00 | 1.00 | 0.75 | 0.50 | 0.67 | 1.25 | 2.00 | 1.33 | 1.25 | 2.00 | 1.25 | 0.33 | 1.33 | 1.00 | 1.75 | 2.00 | 2.50 | 1.75 | 1.67 | 1.00 | 1.58 | 25.13 |
| h | 1.00 | 0.00 | 0.50 | 0.67 | 1.00 | 0.50 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.13 | 2.13 |
| k | 0.50 | 0.00 | 0.00 | 0.67 | 0.50 | 0.50 | 0.50 | 0.00 | 0.67 | 0.50 | 0.75 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.25 | 0.50 | 0.50 | 0.67 | 1.00 | 0.25 | 4.01 |
| x | 0.75 | 0.50 | 3.50 | 2.00 | 3.00 | 1.50 | 3.00 | 2.33 | 1.67 | 1.25 | 4.00 | 3.67 | 3.50 | 2.00 | 3.25 | 2.67 | 1.25 | 0.75 | 0.67 | 2.00 | 1.67 | 0.75 | 1.67 | 2.00 | 1.00 | 0.75 | 0.50 | 0.25 | 1.00 | 2.67 | 1.50 | 1.84 | 29.18 |
| o | 5.25 | 5.50 | 3.50 | 5.00 | 3.50 | 5.00 | 4.50 | 6.00 | 5.33 | 6.00 | 5.00 | 4.00 | 4.00 | 2.75 | 2.75 | 3.33 | 2.50 | 2.50 | 2.33 | 2.00 | 2.00 | 2.00 | 2.67 | 3.67 | 4.00 | 3.75 | 3.75 | 3.50 | 2.00 | 2.33 | 3.00 | 3.66 | 58.06 |
| i | 0.50 | 1.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.33 | 0.00 | 0.25 | 0.75 | 0.33 | 0.75 | 1.50 | 0.75 | 0.67 | 0.75 | 1.00 | 1.33 | 1.25 | 0.33 | 0.25 | 0.00 | 0.00 | 0.00 | 0.75 | 1.25 | 0.75 | 1.00 | 1.00 | 0.50 | 0.60 | 9.47 |
| c | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.33 | 0.50 | 0.25 | 0.00 | 0.00 | 0.00 | 0.25 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.50 | 1.50 | 0.75 | 0.67 | 0.50 | 0.21 | 3.28 |
| CV | 138.50 | 97.00 | 97.00 | 114.67 | 113.50 | 119.50 | 113.50 | 136.00 | 131.00 | 141.75 | 130.75 | 103.67 | 95.00 | 91.00 | 84.00 | 77.33 | 65.25 | 80.00 | 70.33 | 64.00 | 50.00 | 38.25 | 48.00 | 51.00 | 68.67 | 88.75 | 92.50 | 117.25 | 96.25 | 94.67 | 89.50 | 93.50 | 100 |
| CVn | 125.50 | 87.00 | 87.00 | 105.33 | 108.00 | 83.50 | 73.00 | 57.67 | 46.00 | 52.50 | 43.75 | 32.00 | 17.00 | 11.00 | 11.50 | 12.67 | 11.25 | 31.75 | 34.67 | 45.50 | 46.33 | 38.00 | 48.00 | 45.00 | 45.67 | 65.25 | 71.25 | 95.00 | 79.75 | 83.33 | 80.00 | 57.23 | 61.21 |
| CVs | 13.00 | 10.00 | 10.00 | 9.33 | 5.50 | 36.00 | 40.50 | 78.33 | 85.00 | 89.25 | 87.00 | 71.67 | 78.00 | 80.00 | 72.50 | 64.67 | 54.00 | 48.25 | 35.67 | 18.50 | 3.67 | 0.25 | 0.00 | 6.00 | 23.00 | 23.50 | 21.25 | 22.25 | 16.50 | 11.33 | 9.50 | 36.27 | 38.79 |
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