Statistics of sunspot activity
September, 1990
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 | 169.83 | 153.29 | 165.00 | 174.83 | 137.00 | 143.67 | 142.33 | 139.86 | 136.71 | 186.67 | 155.29 | 171.50 | 183.17 | 206.71 | 157.25 | 210.40 | 215.33 | 150.71 | 191.00 | 173.29 | 165.60 | 164.83 | 155.50 | 134.43 | 128.43 | 135.00 | 137.20 | 132.00 | 174.60 | 157.80 | 161.64 | 100 |
| Wn | 74.00 | 73.29 | 82.14 | 97.83 | 73.86 | 81.00 | 86.17 | 89.71 | 97.71 | 120.50 | 94.00 | 96.50 | 103.17 | 98.00 | 68.75 | 82.00 | 65.83 | 44.00 | 67.29 | 69.57 | 69.40 | 69.50 | 66.33 | 49.71 | 45.14 | 41.40 | 51.00 | 45.14 | 54.40 | 32.80 | 73.01 | 45.16 |
| Ws | 95.83 | 80.00 | 82.86 | 77.00 | 63.14 | 62.67 | 56.17 | 50.14 | 39.00 | 66.17 | 61.29 | 75.00 | 80.00 | 108.71 | 88.50 | 128.40 | 149.50 | 106.71 | 123.71 | 103.71 | 96.20 | 95.33 | 89.17 | 84.71 | 83.29 | 93.60 | 86.20 | 86.86 | 120.20 | 125.00 | 88.64 | 54.84 |
| n | 10.17 | 9.14 | 9.57 | 11.83 | 9.71 | 10.33 | 10.50 | 11.14 | 10.57 | 14.17 | 11.71 | 11.83 | 13.17 | 14.00 | 9.88 | 12.80 | 12.17 | 9.14 | 11.00 | 11.29 | 10.00 | 10.33 | 10.17 | 8.43 | 7.71 | 7.40 | 7.20 | 6.86 | 10.20 | 8.40 | 10.36 | 100 |
| A | 2.17 | 0.71 | 0.86 | 2.17 | 1.43 | 1.33 | 1.00 | 2.43 | 2.14 | 4.50 | 1.86 | 0.50 | 2.50 | 2.57 | 0.50 | 2.00 | 2.17 | 1.71 | 1.57 | 0.57 | 0.80 | 0.50 | 1.00 | 0.71 | 1.00 | 1.00 | 1.40 | 0.29 | 1.40 | 1.00 | 1.46 | 14.09 |
| B | 1.33 | 2.14 | 1.43 | 2.00 | 1.57 | 1.00 | 0.50 | 0.43 | 1.29 | 1.33 | 1.43 | 1.17 | 1.17 | 2.29 | 2.25 | 2.60 | 3.00 | 1.14 | 1.57 | 1.86 | 0.80 | 1.17 | 0.67 | 1.00 | 1.14 | 1.60 | 1.80 | 2.00 | 1.80 | 1.40 | 1.50 | 14.44 |
| C | 2.33 | 2.14 | 2.57 | 2.83 | 3.29 | 3.50 | 3.33 | 3.14 | 2.57 | 3.67 | 4.00 | 5.17 | 3.67 | 3.14 | 2.75 | 4.20 | 3.50 | 2.71 | 3.86 | 4.86 | 3.20 | 2.33 | 1.67 | 0.71 | 0.14 | 0.40 | 0.20 | 0.43 | 1.60 | 0.80 | 2.62 | 25.33 |
| D | 1.00 | 1.29 | 1.14 | 1.17 | 0.86 | 0.83 | 0.17 | 0.43 | 0.14 | 1.17 | 0.57 | 1.67 | 2.33 | 2.14 | 1.13 | 1.00 | 1.00 | 1.00 | 2.29 | 1.86 | 4.00 | 3.17 | 2.83 | 1.29 | 1.29 | 0.60 | 0.00 | 0.71 | 2.20 | 3.00 | 1.41 | 13.60 |
| E | 0.67 | 0.43 | 0.57 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.29 | 0.60 | 0.60 | 0.86 | 0.40 | 0.60 | 0.19 | 1.82 |
| 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 | 0.33 | 0.57 | 0.43 | 0.83 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.71 | 1.25 | 1.60 | 1.50 | 0.86 | 0.14 | 0.43 | 0.60 | 1.17 | 1.67 | 2.00 | 1.57 | 1.40 | 1.40 | 0.86 | 0.80 | 0.20 | 0.69 | 6.70 |
| H | 0.00 | 0.29 | 0.14 | 0.17 | 0.00 | 0.17 | 0.17 | 0.00 | 0.00 | 0.00 | 0.14 | 0.17 | 0.33 | 0.57 | 0.88 | 0.40 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 0.14 | 0.29 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.16 | 1.51 |
| I | 2.33 | 1.57 | 2.43 | 2.67 | 2.57 | 3.50 | 4.83 | 4.71 | 4.43 | 3.50 | 3.71 | 3.17 | 3.00 | 2.43 | 1.13 | 1.00 | 0.50 | 1.71 | 1.57 | 1.71 | 0.60 | 1.50 | 2.17 | 2.57 | 2.00 | 1.80 | 1.80 | 1.71 | 2.00 | 1.40 | 2.33 | 22.53 |
| x | 3.50 | 2.86 | 2.29 | 4.17 | 3.00 | 2.33 | 1.50 | 2.86 | 3.43 | 5.83 | 3.29 | 1.67 | 3.67 | 4.86 | 2.75 | 4.60 | 5.17 | 2.86 | 3.14 | 2.43 | 1.60 | 1.67 | 1.67 | 1.71 | 2.14 | 2.60 | 3.20 | 2.29 | 3.20 | 2.40 | 2.96 | 28.52 |
| r | 1.00 | 0.57 | 0.57 | 0.17 | 0.29 | 1.00 | 0.17 | 0.14 | 0.71 | 0.83 | 0.43 | 0.67 | 0.33 | 0.14 | 0.00 | 0.20 | 0.33 | 0.00 | 0.00 | 0.29 | 0.40 | 0.00 | 0.17 | 0.57 | 0.14 | 0.20 | 0.20 | 0.43 | 1.40 | 0.60 | 0.40 | 3.85 |
| s | 2.67 | 2.14 | 2.86 | 3.67 | 3.43 | 2.83 | 4.00 | 5.43 | 4.29 | 4.33 | 4.71 | 4.33 | 3.17 | 4.29 | 2.88 | 2.40 | 2.17 | 2.86 | 4.00 | 3.14 | 2.40 | 3.67 | 4.33 | 2.71 | 2.14 | 2.00 | 1.20 | 1.29 | 1.80 | 2.00 | 3.10 | 29.96 |
| a | 2.00 | 2.29 | 3.14 | 3.50 | 2.86 | 3.33 | 4.67 | 2.71 | 2.14 | 3.17 | 2.71 | 4.17 | 5.00 | 3.29 | 2.13 | 3.20 | 2.50 | 2.29 | 2.71 | 4.43 | 4.60 | 4.33 | 3.17 | 2.00 | 1.57 | 1.20 | 1.20 | 2.00 | 2.80 | 2.40 | 2.92 | 28.15 |
| h | 0.00 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.67 | 0.43 | 0.63 | 0.80 | 0.50 | 0.29 | 0.14 | 0.00 | 0.40 | 0.33 | 0.33 | 0.43 | 0.43 | 0.00 | 0.00 | 0.14 | 0.40 | 0.20 | 0.22 | 2.12 |
| k | 1.00 | 1.14 | 0.71 | 0.33 | 0.14 | 0.83 | 0.17 | 0.00 | 0.00 | 0.00 | 0.57 | 0.67 | 0.33 | 1.00 | 1.50 | 1.60 | 1.50 | 0.86 | 1.00 | 1.00 | 0.60 | 0.33 | 0.50 | 1.00 | 1.29 | 1.40 | 1.40 | 0.71 | 0.60 | 0.80 | 0.77 | 7.40 |
| x | 4.50 | 2.57 | 3.43 | 5.00 | 4.00 | 5.00 | 6.00 | 7.14 | 6.57 | 8.00 | 5.71 | 3.83 | 5.83 | 5.57 | 2.50 | 3.40 | 3.00 | 3.43 | 3.14 | 2.29 | 1.40 | 2.50 | 3.17 | 3.43 | 3.29 | 2.80 | 3.20 | 2.00 | 3.40 | 2.40 | 3.95 | 38.13 |
| o | 5.00 | 5.86 | 5.14 | 6.50 | 5.71 | 5.33 | 4.33 | 4.00 | 4.00 | 5.83 | 5.86 | 8.00 | 7.33 | 8.29 | 7.38 | 9.20 | 9.00 | 5.43 | 7.71 | 8.57 | 8.20 | 7.50 | 6.50 | 4.86 | 4.14 | 4.00 | 3.40 | 4.00 | 6.40 | 4.60 | 6.07 | 58.58 |
| i | 0.50 | 0.71 | 1.00 | 0.33 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.33 | 0.14 | 0.00 | 0.00 | 0.14 | 0.00 | 0.20 | 0.17 | 0.29 | 0.14 | 0.43 | 0.40 | 0.33 | 0.33 | 0.14 | 0.29 | 0.60 | 0.60 | 0.86 | 0.40 | 1.40 | 0.33 | 3.19 |
| c | 0.17 | 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 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.11 |
| CV | 111.83 | 121.14 | 112.14 | 108.17 | 79.71 | 102.33 | 93.83 | 86.29 | 70.14 | 96.17 | 105.14 | 140.17 | 143.17 | 166.43 | 157.88 | 180.40 | 156.83 | 116.57 | 138.29 | 141.00 | 155.80 | 155.83 | 164.17 | 137.71 | 135.14 | 114.20 | 97.80 | 94.29 | 127.00 | 129.20 | 124.63 | 100 |
| CVn | 72.50 | 82.71 | 73.29 | 72.67 | 46.71 | 72.17 | 58.67 | 59.14 | 51.43 | 71.50 | 65.14 | 81.00 | 84.67 | 95.14 | 80.13 | 77.00 | 67.17 | 38.86 | 40.71 | 43.00 | 66.40 | 56.17 | 51.50 | 36.71 | 37.14 | 32.40 | 32.00 | 22.29 | 25.20 | 22.00 | 57.18 | 45.88 |
| CVs | 39.33 | 38.43 | 38.86 | 35.50 | 33.00 | 30.17 | 35.17 | 27.14 | 18.71 | 24.67 | 40.00 | 59.17 | 58.50 | 71.29 | 77.75 | 103.40 | 89.67 | 77.71 | 97.57 | 98.00 | 89.40 | 99.67 | 112.67 | 101.00 | 98.00 | 81.80 | 65.80 | 72.00 | 101.80 | 107.20 | 67.45 | 54.12 |
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