Statistics of sunspot activity
August, 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 | 381.25 | 294.00 | 275.75 | 213.50 | 207.50 | 145.00 | 135.25 | 133.25 | 104.50 | 78.00 | 75.67 | 92.67 | 69.50 | 75.67 | 75.00 | 67.00 | 54.50 | 55.75 | 63.50 | 63.75 | 69.00 | 78.50 | | 101.33 | 155.33 | 189.33 | 173.00 | 224.67 | 234.25 | 188.00 | 176.67 | 141.70 | 100 |
| Wn | 190.25 | 134.67 | 91.00 | 88.50 | 100.00 | 82.50 | 81.50 | 74.75 | 43.75 | 8.67 | 0.00 | 21.00 | 17.50 | 26.00 | 31.75 | 27.25 | 24.75 | 43.00 | 46.75 | 40.75 | 32.50 | 28.50 | | 35.67 | 83.33 | 84.33 | 60.50 | 113.00 | 124.75 | 98.25 | 93.00 | 64.27 | 45.36 |
| Ws | 191.00 | 159.33 | 184.75 | 125.00 | 107.50 | 62.50 | 53.75 | 58.50 | 60.75 | 69.33 | 75.67 | 71.67 | 52.00 | 49.67 | 43.25 | 39.75 | 29.75 | 12.75 | 16.75 | 23.00 | 36.50 | 50.00 | | 65.67 | 72.00 | 105.00 | 112.50 | 111.67 | 109.50 | 89.75 | 83.67 | 77.43 | 54.64 |
| n | 15.50 | 13.33 | 11.50 | 9.25 | 10.25 | 7.50 | 7.25 | 7.50 | 6.00 | 3.00 | 3.00 | 4.67 | 4.00 | 5.00 | 5.00 | 4.75 | 4.00 | 3.50 | 3.50 | 4.00 | 4.00 | 3.00 | | 4.67 | 8.33 | 9.33 | 7.00 | 8.67 | 8.75 | 8.25 | 9.00 | 6.78 | 100 |
| A | 0.50 | 2.33 | 2.50 | 0.75 | 0.00 | 0.75 | 1.25 | 0.50 | 1.50 | 0.33 | 0.00 | 0.33 | 1.00 | 0.67 | 1.00 | 0.25 | 0.50 | 0.25 | 0.75 | 0.25 | 1.00 | 0.00 | | 0.33 | 0.67 | 1.67 | 0.50 | 1.00 | 0.75 | 1.00 | 0.00 | 0.74 | 10.97 |
| B | 2.25 | 2.67 | 0.50 | 0.50 | 2.50 | 2.00 | 1.00 | 0.75 | 0.75 | 0.33 | 0.33 | 1.33 | 0.50 | 1.67 | 1.00 | 1.25 | 1.25 | 1.25 | 0.50 | 0.25 | 0.00 | 0.00 | | 0.67 | 2.00 | 1.00 | 1.25 | 1.33 | 1.25 | 1.50 | 3.00 | 1.15 | 16.99 |
| C | 5.25 | 2.00 | 1.00 | 1.25 | 0.75 | 1.00 | 0.50 | 1.25 | 1.25 | 1.33 | 1.67 | 1.00 | 0.00 | 0.67 | 1.50 | 2.25 | 1.25 | 1.25 | 0.75 | 1.25 | 1.00 | 0.00 | | 1.33 | 2.00 | 3.33 | 2.50 | 1.67 | 1.25 | 1.50 | 1.67 | 1.45 | 21.33 |
| D | 1.75 | 1.33 | 3.00 | 1.50 | 1.50 | 0.75 | 2.25 | 2.25 | 0.75 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 0.75 | 0.00 | 0.50 | 1.00 | 0.75 | 0.50 | 0.50 | | 0.33 | 0.33 | 1.33 | 1.00 | 2.33 | 2.00 | 1.50 | 1.00 | 0.99 | 14.58 |
| E | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.33 | 0.00 | 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 | 0.00 | 0.25 | 0.25 | 1.00 | 0.15 | 2.21 |
| F | 2.00 | 3.00 | 2.50 | 1.50 | 1.00 | 1.00 | 1.00 | 1.00 | 0.00 | 0.67 | 1.00 | 0.33 | 1.00 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | | 1.00 | 1.00 | 1.00 | 1.25 | 1.33 | 1.00 | 0.75 | 0.67 | 0.86 | 12.61 |
| G | 0.00 | 0.67 | 0.50 | 3.00 | 3.00 | 0.50 | 0.00 | 0.50 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.75 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 1.25 | 1.50 | | 0.33 | 0.67 | 0.33 | 0.00 | 0.00 | 0.00 | 0.50 | 0.33 | 0.50 | 7.33 |
| H | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.33 | 0.00 | 0.00 | 0.25 | 0.25 | 0.25 | 0.50 | 0.25 | 0.00 | | 0.00 | 0.00 | 0.00 | 0.50 | 0.67 | 1.00 | 0.75 | 0.00 | 0.18 | 2.58 |
| I | 2.75 | 1.33 | 1.50 | 0.75 | 1.50 | 1.50 | 1.25 | 1.25 | 0.50 | 0.00 | 0.00 | 1.00 | 1.00 | 0.67 | 0.00 | 0.25 | 0.75 | 0.00 | 0.25 | 0.50 | 0.00 | 0.00 | | 0.67 | 1.67 | 0.67 | 0.00 | 0.33 | 1.25 | 0.50 | 1.33 | 0.77 | 11.38 |
| x | 2.75 | 5.00 | 3.00 | 1.25 | 2.50 | 2.75 | 2.25 | 1.25 | 2.25 | 0.67 | 0.33 | 1.67 | 1.50 | 2.33 | 2.00 | 1.50 | 1.75 | 1.50 | 1.25 | 0.50 | 1.00 | 0.00 | | 1.00 | 2.67 | 2.67 | 1.75 | 2.33 | 2.00 | 2.50 | 3.00 | 1.90 | 27.97 |
| r | 1.00 | 0.00 | 0.75 | 0.00 | 0.50 | 0.75 | 0.50 | 1.25 | 0.50 | 0.33 | 0.33 | 1.00 | 0.00 | 0.00 | 0.50 | 0.50 | 1.00 | 0.25 | 0.25 | 0.75 | 0.00 | 0.00 | | 0.00 | 0.67 | 0.33 | 0.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.41 | 5.98 |
| s | 6.00 | 3.00 | 1.50 | 2.25 | 3.25 | 2.00 | 3.00 | 3.00 | 1.00 | 1.33 | 1.67 | 1.00 | 1.50 | 1.67 | 1.50 | 1.50 | 0.25 | 0.25 | 0.75 | 0.75 | 0.25 | 0.00 | | 1.00 | 1.67 | 2.33 | 1.25 | 1.33 | 2.50 | 2.25 | 3.00 | 1.76 | 25.92 |
| a | 3.25 | 2.33 | 3.75 | 3.75 | 2.50 | 1.25 | 1.25 | 2.00 | 2.25 | 0.67 | 0.67 | 1.00 | 0.50 | 0.00 | 0.00 | 0.25 | 0.00 | 0.50 | 0.25 | 0.25 | 1.00 | 1.50 | | 1.67 | 2.33 | 3.00 | 2.00 | 2.33 | 2.75 | 2.50 | 2.67 | 1.61 | 23.67 |
| h | 0.00 | 0.67 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.50 | 0.00 | 0.00 | 0.50 | 0.25 | 0.75 | 0.00 | | 0.00 | 0.33 | 0.67 | 0.75 | 0.67 | 0.75 | 0.75 | 0.00 | 0.24 | 3.48 |
| k | 2.50 | 2.33 | 2.50 | 2.00 | 1.25 | 0.75 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 1.00 | 0.75 | 0.50 | 1.00 | 1.00 | 0.50 | 1.50 | 1.00 | 1.50 | | 1.00 | 0.67 | 0.33 | 1.25 | 1.00 | 0.75 | 0.25 | 0.33 | 0.88 | 12.98 |
| x | 3.25 | 3.67 | 4.00 | 1.50 | 1.50 | 2.25 | 2.50 | 1.75 | 2.00 | 0.33 | 0.00 | 1.33 | 2.50 | 1.67 | 1.00 | 0.50 | 1.50 | 0.50 | 1.25 | 1.25 | 1.25 | 0.00 | | 1.00 | 2.33 | 2.33 | 1.00 | 2.00 | 3.00 | 2.25 | 1.33 | 1.69 | 24.94 |
| o | 9.25 | 6.00 | 4.50 | 6.25 | 7.50 | 4.25 | 3.75 | 4.50 | 2.75 | 1.67 | 2.00 | 2.33 | 0.50 | 2.67 | 4.00 | 4.25 | 2.50 | 3.00 | 2.25 | 2.75 | 2.75 | 2.00 | | 2.67 | 5.00 | 6.00 | 4.75 | 5.00 | 3.50 | 4.00 | 6.00 | 3.94 | 58.15 |
| i | 2.25 | 3.33 | 1.75 | 0.75 | 1.00 | 0.75 | 0.75 | 1.25 | 0.75 | 0.67 | 0.67 | 1.00 | 0.50 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | | 1.00 | 0.67 | 0.67 | 0.50 | 1.00 | 1.25 | 1.50 | 1.00 | 0.79 | 11.71 |
| c | 0.75 | 0.33 | 1.25 | 0.75 | 0.25 | 0.25 | 0.25 | 0.00 | 0.50 | 0.33 | 0.33 | 0.00 | 0.50 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | | 0.00 | 0.33 | 0.33 | 0.75 | 0.67 | 1.00 | 0.50 | 0.67 | 0.35 | 5.20 |
| CV | 253.75 | 233.67 | 225.25 | 206.00 | 187.25 | 96.75 | 103.00 | 107.25 | 67.00 | 41.33 | 45.00 | 41.33 | 60.50 | 79.00 | 78.75 | 69.75 | 47.75 | 52.50 | 63.25 | 88.50 | 98.75 | 105.00 | | 86.33 | 109.67 | 131.33 | 141.50 | 157.33 | 162.75 | 133.50 | 120.33 | 113.14 | 100 |
| CVn | 132.25 | 77.67 | 84.75 | 84.25 | 82.75 | 46.50 | 55.00 | 51.25 | 19.75 | 2.33 | 0.00 | 4.00 | 20.00 | 39.67 | 43.75 | 46.25 | 38.75 | 47.75 | 49.50 | 39.00 | 28.25 | 31.50 | | 22.00 | 39.00 | 52.67 | 35.25 | 61.67 | 75.75 | 73.25 | 70.33 | 48.49 | 42.86 |
| CVs | 121.50 | 156.00 | 140.50 | 121.75 | 104.50 | 50.25 | 48.00 | 56.00 | 47.25 | 39.00 | 45.00 | 37.33 | 40.50 | 39.33 | 35.00 | 23.50 | 9.00 | 4.75 | 13.75 | 49.50 | 70.50 | 73.50 | | 64.33 | 70.67 | 78.67 | 106.25 | 95.67 | 87.00 | 60.25 | 50.00 | 64.64 | 57.14 |
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