Statistics of sunspot activity
September, 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 | Average | % |
| W | 131.50 | 107.75 | 103.00 | 99.50 | 94.50 | 88.67 | 99.00 | 101.67 | 101.33 | 89.33 | 90.25 | 121.25 | 161.33 | 157.00 | 169.00 | 158.33 | 133.00 | 133.50 | 105.25 | 83.50 | 71.75 | 95.25 | 84.00 | 61.00 | 36.00 | 40.67 | 40.50 | 75.50 | 69.00 | 70.00 | 99.08 | 100 |
| Wn | 86.50 | 76.00 | 70.25 | 78.75 | 80.00 | 76.33 | 74.33 | 62.00 | 51.67 | 50.67 | 56.00 | 91.50 | 124.67 | 124.50 | 140.25 | 129.00 | 104.33 | 101.00 | 79.25 | 62.25 | 53.25 | 43.75 | 36.67 | 18.25 | 11.00 | 18.33 | 22.75 | 46.00 | 43.33 | 46.00 | 68.62 | 69.26 |
| Ws | 45.00 | 31.75 | 32.75 | 20.75 | 14.50 | 12.33 | 24.67 | 39.67 | 49.67 | 38.67 | 34.25 | 29.75 | 36.67 | 32.50 | 28.75 | 29.33 | 28.67 | 32.50 | 26.00 | 21.25 | 18.50 | 51.50 | 47.33 | 42.75 | 25.00 | 22.33 | 17.75 | 29.50 | 25.67 | 24.00 | 30.46 | 30.74 |
| n | 7.50 | 7.00 | 7.25 | 6.75 | 6.50 | 5.67 | 6.33 | 7.33 | 6.33 | 4.67 | 5.00 | 5.50 | 6.67 | 6.00 | 7.00 | 8.00 | 7.00 | 8.00 | 6.25 | 5.50 | 4.25 | 5.75 | 5.67 | 4.25 | 3.00 | 3.67 | 3.50 | 6.00 | 5.67 | 6.00 | 5.93 | 100 |
| A | 1.00 | 0.50 | 0.50 | 0.25 | 0.75 | 0.67 | 0.00 | 1.00 | 1.00 | 0.67 | 1.00 | 0.25 | 0.00 | 0.00 | 0.50 | 0.67 | 0.33 | 0.75 | 0.50 | 1.00 | 0.75 | 1.25 | 1.33 | 0.75 | 0.33 | 1.00 | 0.25 | 1.50 | 1.33 | 1.25 | 0.70 | 11.84 |
| B | 0.25 | 0.75 | 1.75 | 2.25 | 1.50 | 1.00 | 2.00 | 0.67 | 1.00 | 0.00 | 0.75 | 0.00 | 0.67 | 0.00 | 0.25 | 1.00 | 0.00 | 0.75 | 0.00 | 0.00 | 0.75 | 1.00 | 1.00 | 0.50 | 0.67 | 0.00 | 0.50 | 1.50 | 1.00 | 1.00 | 0.75 | 12.64 |
| C | 1.75 | 2.50 | 2.50 | 1.00 | 0.50 | 1.00 | 1.33 | 1.33 | 1.67 | 1.33 | 0.50 | 0.50 | 1.00 | 2.00 | 2.75 | 1.00 | 0.33 | 1.00 | 1.25 | 1.00 | 1.50 | 2.00 | 2.33 | 1.25 | 0.67 | 0.33 | 0.50 | 1.00 | 1.00 | 0.25 | 1.24 | 20.83 |
| D | 1.00 | 1.00 | 0.75 | 1.00 | 1.25 | 2.67 | 1.67 | 1.67 | 1.00 | 0.67 | 1.25 | 2.50 | 1.67 | 0.75 | 0.50 | 0.00 | 1.67 | 2.00 | 0.75 | 1.25 | 0.50 | 0.50 | 0.33 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.91 | 15.36 |
| E | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 1.00 | 0.25 | 0.50 | 0.33 | 1.50 | 1.25 | 1.00 | 0.67 | 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 | 0.25 | 4.26 |
| F | 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 | 0.00 | 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 |
| G | 1.25 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.33 | 0.00 | 0.50 | 0.50 | 1.67 | 1.50 | 1.75 | 2.67 | 1.67 | 1.00 | 1.25 | 0.75 | 0.50 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.54 | 9.08 |
| 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 | 0.00 | 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 | 0.00 | 0.00 | 0.00 | 0.00 |
| I | 1.75 | 2.00 | 1.75 | 2.25 | 2.50 | 0.33 | 1.33 | 2.00 | 1.33 | 1.00 | 0.75 | 1.25 | 1.33 | 0.25 | 0.00 | 1.67 | 2.33 | 2.25 | 2.50 | 1.50 | 0.25 | 0.75 | 0.67 | 0.75 | 1.33 | 2.33 | 2.25 | 2.00 | 2.33 | 3.50 | 1.54 | 25.98 |
| x | 1.25 | 1.25 | 2.25 | 2.50 | 2.25 | 1.67 | 2.00 | 1.67 | 2.00 | 0.67 | 1.75 | 0.25 | 0.67 | 0.00 | 0.75 | 1.67 | 0.33 | 1.50 | 0.50 | 1.00 | 1.50 | 2.25 | 2.33 | 1.25 | 1.00 | 1.00 | 0.75 | 3.00 | 2.33 | 2.25 | 1.45 | 24.49 |
| r | 1.25 | 1.25 | 1.00 | 0.75 | 0.50 | 0.67 | 1.00 | 0.00 | 1.00 | 0.67 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.75 | 0.00 | 1.00 | 0.67 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.41 | 6.88 |
| s | 2.75 | 3.00 | 2.75 | 2.75 | 2.25 | 1.00 | 1.67 | 4.00 | 1.33 | 2.33 | 1.75 | 3.50 | 3.33 | 4.00 | 3.50 | 4.33 | 3.00 | 5.00 | 4.00 | 3.00 | 2.50 | 2.25 | 2.33 | 2.25 | 2.00 | 2.67 | 1.75 | 3.00 | 3.33 | 3.25 | 2.82 | 47.52 |
| a | 2.00 | 1.50 | 1.25 | 0.75 | 1.50 | 2.33 | 1.67 | 1.67 | 2.00 | 0.67 | 1.00 | 1.75 | 2.67 | 1.50 | 2.25 | 1.00 | 3.67 | 1.50 | 0.75 | 0.75 | 0.25 | 0.25 | 0.33 | 0.50 | 0.00 | 0.00 | 1.00 | 0.00 | 0.00 | 0.25 | 1.16 | 19.52 |
| h | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.19 |
| k | 0.25 | 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 | 0.50 | 1.00 | 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 | 0.08 | 1.40 |
| x | 2.75 | 2.50 | 2.25 | 2.50 | 3.25 | 1.00 | 1.33 | 3.00 | 2.33 | 1.67 | 1.75 | 1.50 | 1.33 | 0.25 | 0.50 | 2.33 | 2.67 | 3.00 | 3.00 | 2.50 | 1.00 | 2.00 | 2.00 | 1.50 | 1.67 | 3.33 | 2.50 | 3.50 | 3.67 | 4.75 | 2.24 | 37.83 |
| o | 3.75 | 4.50 | 5.00 | 4.00 | 3.25 | 4.67 | 4.67 | 4.00 | 3.67 | 2.00 | 2.50 | 2.00 | 4.00 | 3.75 | 4.75 | 4.67 | 3.33 | 4.00 | 2.75 | 2.75 | 3.00 | 3.75 | 3.67 | 2.75 | 1.33 | 0.33 | 1.00 | 2.50 | 2.00 | 1.25 | 3.19 | 53.70 |
| i | 0.75 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.33 | 0.33 | 0.33 | 1.00 | 0.75 | 2.00 | 1.33 | 1.75 | 1.50 | 1.00 | 1.00 | 1.00 | 0.50 | 0.25 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.48 | 8.05 |
| c | 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 | 0.25 | 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 | 0.03 | 0.42 |
| CV | 100.75 | 65.25 | 57.25 | 55.00 | 56.50 | 65.67 | 60.67 | 90.00 | 53.33 | 69.00 | 64.00 | 102.25 | 107.33 | 128.75 | 125.50 | 140.67 | 111.67 | 112.25 | 81.50 | 68.75 | 46.75 | 43.50 | 38.00 | 43.50 | 22.33 | 28.00 | 26.25 | 35.50 | 37.67 | 38.75 | 69.21 | 100 |
| CVn | 67.00 | 52.75 | 46.75 | 51.50 | 53.50 | 64.00 | 45.00 | 47.33 | 27.67 | 35.33 | 40.50 | 77.75 | 84.33 | 103.75 | 112.25 | 116.33 | 82.67 | 84.50 | 55.25 | 46.00 | 28.25 | 22.00 | 14.33 | 9.50 | 10.00 | 16.67 | 18.25 | 23.50 | 28.67 | 31.00 | 49.88 | 72.07 |
| CVs | 33.75 | 12.50 | 10.50 | 3.50 | 3.00 | 1.67 | 15.67 | 42.67 | 25.67 | 33.67 | 23.50 | 24.50 | 23.00 | 25.00 | 13.25 | 24.33 | 29.00 | 27.75 | 26.25 | 22.75 | 18.50 | 21.50 | 23.67 | 34.00 | 12.33 | 11.33 | 8.00 | 12.00 | 9.00 | 7.75 | 19.33 | 27.93 |
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