Statistics of sunspot activity
February, 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 | Average | % |
| W | 43.00 | 41.00 | 30.25 | 20.00 | 14.67 | 23.50 | 39.00 | 63.50 | 46.25 | 61.33 | 82.67 | 143.67 | 188.33 | 199.00 | 166.67 | 160.33 | 92.33 | 122.67 | 102.67 | 105.67 | 99.00 | 87.33 | 39.00 | 51.00 | 63.50 | 76.00 | 84.00 | 118.33 | 84.45 | 100 |
| Wn | 29.50 | 5.50 | 8.75 | 0.00 | 0.00 | 0.00 | 11.00 | 25.50 | 30.50 | 41.00 | 51.00 | 96.00 | 123.67 | 113.00 | 86.33 | 90.33 | 44.00 | 67.00 | 63.67 | 70.00 | 66.33 | 58.67 | 25.50 | 36.67 | 45.00 | 62.50 | 63.67 | 93.00 | 50.29 | 59.55 |
| Ws | 13.50 | 35.50 | 21.50 | 20.00 | 14.67 | 23.50 | 28.00 | 38.00 | 15.75 | 20.33 | 31.67 | 47.67 | 64.67 | 86.00 | 80.33 | 70.00 | 48.33 | 55.67 | 39.00 | 35.67 | 32.67 | 28.67 | 13.50 | 14.33 | 18.50 | 13.50 | 20.33 | 25.33 | 34.16 | 40.45 |
| n | 3.50 | 2.50 | 2.00 | 1.00 | 1.00 | 1.75 | 3.25 | 5.00 | 3.25 | 3.33 | 4.00 | 6.33 | 8.00 | 8.33 | 8.67 | 9.00 | 6.00 | 8.33 | 7.00 | 7.33 | 7.67 | 6.67 | 3.00 | 3.67 | 4.00 | 4.50 | 5.33 | 6.00 | 5.01 | 100 |
| A | 1.50 | 0.50 | 0.50 | 0.00 | 0.00 | 0.00 | 2.00 | 1.50 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.67 | 1.00 | 1.00 | 0.33 | 0.67 | 0.00 | 0.33 | 1.33 | 2.00 | 0.00 | 1.00 | 1.50 | 0.50 | 1.00 | 0.33 | 0.64 | 12.76 |
| B | 1.00 | 1.50 | 0.25 | 0.00 | 0.33 | 0.00 | 0.25 | 0.75 | 0.00 | 0.00 | 0.00 | 0.67 | 1.00 | 0.33 | 0.67 | 0.33 | 0.33 | 0.67 | 0.33 | 1.33 | 0.67 | 1.00 | 0.00 | 0.00 | 1.00 | 1.50 | 2.00 | 1.33 | 0.62 | 12.28 |
| C | 0.50 | 0.50 | 0.25 | 0.50 | 0.67 | 1.25 | 0.75 | 0.75 | 0.75 | 0.00 | 0.00 | 0.67 | 0.00 | 2.33 | 2.00 | 1.33 | 0.67 | 1.00 | 1.67 | 2.33 | 3.33 | 2.00 | 0.50 | 0.67 | 1.00 | 1.50 | 1.00 | 3.00 | 1.10 | 22.02 |
| D | 0.00 | 0.00 | 1.00 | 0.50 | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 1.67 | 1.33 | 1.00 | 2.00 | 2.00 | 2.33 | 2.00 | 2.67 | 2.33 | 2.33 | 1.00 | 0.67 | 0.33 | 1.50 | 1.33 | 0.50 | 1.00 | 0.67 | 0.00 | 1.02 | 20.42 |
| E | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.67 | 1.00 | 0.67 | 1.00 | 1.00 | 1.00 | 0.67 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.24 | 4.75 |
| F | 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 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.47 |
| G | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.67 | 1.67 | 2.33 | 2.00 | 0.67 | 0.67 | 1.33 | 0.67 | 1.00 | 0.67 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.48 | 9.50 |
| H | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.50 | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.07 | 1.42 |
| I | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.25 | 1.00 | 0.75 | 0.33 | 0.00 | 0.67 | 2.00 | 1.33 | 1.00 | 2.00 | 1.33 | 2.33 | 2.00 | 2.00 | 1.00 | 1.00 | 1.00 | 0.67 | 0.00 | 0.00 | 0.67 | 0.67 | 0.82 | 16.38 |
| x | 2.50 | 2.00 | 0.75 | 0.00 | 0.33 | 0.00 | 2.25 | 2.25 | 0.25 | 0.00 | 0.00 | 0.67 | 1.00 | 1.00 | 1.67 | 1.33 | 0.67 | 1.33 | 0.33 | 1.67 | 2.00 | 3.00 | 0.00 | 1.00 | 2.50 | 2.00 | 3.00 | 1.67 | 1.26 | 25.04 |
| r | 0.00 | 0.50 | 0.25 | 0.00 | 0.00 | 0.75 | 0.25 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.67 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.67 | 0.00 | 0.00 | 0.00 | 0.50 | 0.33 | 1.00 | 0.22 | 4.39 |
| s | 0.50 | 0.00 | 0.25 | 0.25 | 0.33 | 0.50 | 0.25 | 1.50 | 1.50 | 1.33 | 1.33 | 1.33 | 3.33 | 3.33 | 3.67 | 3.67 | 2.67 | 3.33 | 4.00 | 3.00 | 3.00 | 2.67 | 1.00 | 2.00 | 0.50 | 2.00 | 2.00 | 2.00 | 1.83 | 36.50 |
| a | 0.50 | 0.00 | 0.75 | 0.75 | 0.33 | 0.50 | 0.50 | 0.50 | 0.50 | 1.00 | 1.67 | 3.00 | 1.33 | 1.33 | 0.67 | 2.00 | 1.67 | 2.33 | 1.67 | 2.00 | 1.67 | 0.00 | 2.00 | 0.67 | 1.00 | 0.00 | 0.00 | 1.33 | 1.06 | 21.13 |
| h | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.50 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.67 | 0.33 | 0.00 | 1.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 2.85 |
| k | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.33 | 1.00 | 1.33 | 2.00 | 2.00 | 1.33 | 1.67 | 1.00 | 0.33 | 1.00 | 0.67 | 0.67 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.51 | 10.09 |
| x | 2.00 | 0.50 | 0.50 | 0.00 | 0.00 | 0.50 | 2.25 | 3.00 | 1.50 | 0.33 | 0.00 | 0.67 | 2.00 | 2.00 | 2.00 | 3.00 | 1.67 | 3.00 | 2.00 | 2.33 | 3.00 | 3.33 | 1.00 | 1.67 | 1.50 | 0.50 | 1.67 | 1.00 | 1.53 | 30.56 |
| o | 1.50 | 2.00 | 1.50 | 1.00 | 1.00 | 1.25 | 1.00 | 2.00 | 1.75 | 2.00 | 2.67 | 4.33 | 4.67 | 5.33 | 5.00 | 4.67 | 4.33 | 5.00 | 5.00 | 5.00 | 4.67 | 3.33 | 2.00 | 2.00 | 2.50 | 4.00 | 3.67 | 4.67 | 3.14 | 62.55 |
| i | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.67 | 1.33 | 1.33 | 1.00 | 0.67 | 1.00 | 1.33 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.29 | 5.70 |
| c | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.33 | 0.33 | 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 | 0.06 | 1.19 |
| CV | 12.50 | 6.00 | 22.75 | 14.25 | 7.00 | 12.75 | 10.25 | 50.00 | 73.25 | 102.00 | 115.00 | 140.33 | 182.00 | 162.67 | 176.00 | 178.33 | 113.67 | 149.33 | 126.00 | 88.33 | 92.67 | 52.67 | 44.00 | 44.33 | 22.50 | 42.00 | 37.33 | 49.00 | 75.96 | 100 |
| CVn | 10.50 | 0.50 | 1.00 | 0.00 | 0.00 | 0.00 | 2.50 | 21.75 | 34.00 | 47.00 | 46.67 | 67.00 | 117.00 | 92.00 | 90.67 | 95.67 | 50.00 | 77.33 | 67.67 | 45.67 | 41.33 | 28.67 | 22.00 | 21.33 | 7.50 | 24.00 | 26.00 | 34.00 | 38.28 | 50.39 |
| CVs | 2.00 | 5.50 | 21.75 | 14.25 | 7.00 | 12.75 | 7.75 | 28.25 | 39.25 | 55.00 | 68.33 | 73.33 | 65.00 | 70.67 | 85.33 | 82.67 | 63.67 | 72.00 | 58.33 | 42.67 | 51.33 | 24.00 | 22.00 | 23.00 | 15.00 | 18.00 | 11.33 | 15.00 | 37.68 | 49.61 |
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