Statistics of sunspot activity
August, 1991
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 | 168.83 | 168.83 | 191.40 | 157.83 | 169.75 | 164.67 | 141.14 | 137.83 | 108.50 | 103.50 | 123.86 | 145.20 | 172.00 | 163.43 | 204.00 | 286.50 | 352.29 | 356.86 | 350.14 | 401.29 | 427.00 | 415.86 | 403.33 | 326.13 | 240.29 | 200.43 | 168.75 | 200.00 | 210.17 | 234.25 | 227.00 | 229.71 | 100 |
| Wn | 111.50 | 99.33 | 92.80 | 78.33 | 91.50 | 82.50 | 59.29 | 59.50 | 58.50 | 54.33 | 61.86 | 65.40 | 61.40 | 51.43 | 38.67 | 52.50 | 79.14 | 96.43 | 106.71 | 140.29 | 160.57 | 159.71 | 173.17 | 161.38 | 118.71 | 114.71 | 102.13 | 90.20 | 89.67 | 91.88 | 85.71 | 93.20 | 40.57 |
| Ws | 57.33 | 69.50 | 98.60 | 79.50 | 78.25 | 82.17 | 81.86 | 78.33 | 50.00 | 49.17 | 62.00 | 79.80 | 110.60 | 112.00 | 165.33 | 234.00 | 273.14 | 260.43 | 243.43 | 261.00 | 266.43 | 256.14 | 230.17 | 164.75 | 121.57 | 85.71 | 66.63 | 109.80 | 120.50 | 142.38 | 141.29 | 136.51 | 59.43 |
| n | 8.50 | 8.33 | 9.40 | 8.17 | 9.63 | 10.00 | 9.29 | 9.50 | 8.13 | 7.67 | 8.57 | 9.20 | 11.20 | 11.14 | 13.33 | 15.33 | 16.14 | 16.14 | 16.43 | 19.29 | 18.71 | 19.71 | 20.33 | 19.75 | 16.57 | 14.14 | 11.50 | 10.20 | 11.00 | 9.50 | 9.86 | 12.47 | 100 |
| A | 1.67 | 0.67 | 1.20 | 0.83 | 2.25 | 1.83 | 1.29 | 1.33 | 1.25 | 2.33 | 1.86 | 0.80 | 1.40 | 2.14 | 0.83 | 0.83 | 1.29 | 0.43 | 0.71 | 1.00 | 1.00 | 1.14 | 1.33 | 2.38 | 0.86 | 1.43 | 1.25 | 0.20 | 0.50 | 0.50 | 1.43 | 1.22 | 9.82 |
| B | 0.33 | 1.33 | 0.60 | 0.83 | 1.75 | 0.67 | 0.71 | 0.67 | 0.50 | 0.33 | 1.29 | 2.40 | 2.40 | 1.71 | 1.33 | 0.83 | 0.71 | 0.71 | 2.29 | 2.29 | 1.57 | 1.71 | 2.50 | 1.50 | 1.00 | 0.57 | 0.75 | 0.00 | 0.67 | 0.38 | 0.57 | 1.13 | 9.03 |
| C | 1.33 | 1.50 | 1.20 | 1.50 | 2.50 | 3.33 | 2.57 | 2.83 | 1.88 | 0.67 | 0.86 | 2.60 | 3.80 | 2.57 | 3.00 | 4.33 | 3.43 | 4.43 | 4.14 | 6.00 | 6.29 | 6.86 | 7.33 | 6.38 | 4.29 | 4.86 | 2.13 | 2.40 | 2.67 | 1.88 | 0.29 | 3.22 | 25.82 |
| D | 2.33 | 2.33 | 3.00 | 1.83 | 0.38 | 0.50 | 0.86 | 1.00 | 1.00 | 1.50 | 1.57 | 0.80 | 0.60 | 2.71 | 4.50 | 4.50 | 4.43 | 3.57 | 3.71 | 3.71 | 4.00 | 4.14 | 2.67 | 2.63 | 2.86 | 1.57 | 1.38 | 3.20 | 3.17 | 2.63 | 2.71 | 2.44 | 19.60 |
| E | 0.67 | 1.00 | 0.60 | 0.67 | 0.50 | 0.00 | 0.14 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.50 | 1.71 | 2.00 | 1.57 | 2.00 | 2.00 | 1.57 | 0.83 | 1.00 | 0.71 | 0.29 | 0.25 | 0.40 | 0.00 | 0.75 | 0.71 | 0.68 | 5.44 |
| F | 0.00 | 0.00 | 0.20 | 0.00 | 0.25 | 0.33 | 0.00 | 0.00 | 0.13 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.29 | 0.14 | 0.00 | 0.00 | 0.00 | 0.14 | 0.17 | 0.00 | 0.14 | 0.29 | 0.50 | 0.60 | 0.50 | 0.75 | 0.71 | 0.17 | 1.33 |
| G | 0.00 | 0.00 | 0.40 | 0.33 | 0.25 | 0.67 | 0.86 | 0.83 | 0.38 | 0.00 | 0.00 | 0.00 | 0.60 | 0.00 | 0.33 | 0.33 | 0.86 | 0.43 | 0.71 | 0.86 | 0.86 | 0.57 | 1.17 | 1.13 | 0.43 | 0.00 | 0.50 | 0.00 | 0.50 | 0.38 | 0.57 | 0.45 | 3.60 |
| H | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.38 | 0.50 | 0.43 | 0.60 | 0.40 | 0.43 | 0.33 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.00 | 0.38 | 0.43 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 1.12 |
| I | 2.00 | 1.50 | 2.20 | 2.17 | 1.75 | 2.67 | 2.86 | 2.67 | 2.63 | 2.33 | 2.57 | 2.00 | 2.00 | 1.57 | 3.00 | 2.83 | 3.43 | 4.43 | 3.29 | 3.43 | 3.00 | 3.43 | 4.33 | 4.38 | 5.86 | 5.14 | 4.75 | 3.40 | 3.00 | 2.25 | 2.86 | 3.02 | 24.23 |
| x | 2.00 | 2.00 | 1.80 | 1.67 | 4.00 | 2.50 | 2.00 | 2.00 | 1.75 | 2.67 | 3.14 | 3.20 | 3.80 | 3.86 | 2.17 | 1.67 | 2.00 | 1.14 | 3.00 | 3.29 | 2.57 | 2.86 | 3.83 | 3.88 | 1.86 | 2.00 | 2.00 | 0.20 | 1.17 | 0.88 | 2.00 | 2.35 | 18.85 |
| r | 0.00 | 0.17 | 0.20 | 0.00 | 0.13 | 1.33 | 0.57 | 0.67 | 0.25 | 0.17 | 0.57 | 2.00 | 1.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.29 | 0.00 | 0.71 | 0.29 | 0.43 | 0.33 | 0.13 | 0.86 | 1.29 | 0.00 | 0.20 | 0.33 | 0.50 | 0.29 | 0.42 | 3.38 |
| s | 2.67 | 3.17 | 2.40 | 2.83 | 2.38 | 2.33 | 3.57 | 2.83 | 3.00 | 1.83 | 2.43 | 1.80 | 1.80 | 3.00 | 3.83 | 5.33 | 4.43 | 5.43 | 5.86 | 7.00 | 6.43 | 6.57 | 7.00 | 7.38 | 6.29 | 6.71 | 5.38 | 5.20 | 3.33 | 2.75 | 2.86 | 4.12 | 33.06 |
| a | 2.33 | 2.00 | 4.00 | 2.67 | 2.13 | 2.83 | 2.14 | 3.17 | 2.13 | 2.33 | 2.00 | 1.60 | 3.80 | 3.57 | 6.00 | 5.83 | 6.57 | 5.71 | 4.00 | 4.14 | 5.00 | 6.00 | 6.83 | 5.13 | 5.00 | 3.43 | 3.00 | 3.40 | 5.00 | 2.88 | 3.14 | 3.80 | 30.46 |
| h | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.25 | 0.33 | 0.43 | 0.40 | 0.20 | 0.43 | 0.67 | 0.83 | 0.43 | 0.86 | 0.29 | 0.29 | 0.57 | 0.71 | 0.00 | 0.63 | 0.29 | 0.00 | 0.00 | 0.00 | 0.00 | 0.13 | 0.43 | 0.27 | 2.15 |
| k | 1.50 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.67 | 0.75 | 0.33 | 0.00 | 0.20 | 0.20 | 0.29 | 0.67 | 1.67 | 2.71 | 2.71 | 3.29 | 3.86 | 3.86 | 3.14 | 2.33 | 2.63 | 2.29 | 0.71 | 1.13 | 1.20 | 1.17 | 2.38 | 1.14 | 1.51 | 12.11 |
| x | 3.83 | 2.17 | 3.40 | 3.00 | 4.00 | 4.50 | 4.14 | 4.00 | 4.25 | 5.17 | 4.86 | 3.40 | 3.80 | 4.14 | 4.17 | 3.83 | 4.71 | 4.86 | 4.00 | 4.43 | 4.00 | 4.71 | 5.67 | 7.13 | 7.14 | 6.57 | 6.00 | 3.60 | 3.50 | 2.75 | 4.29 | 4.39 | 35.18 |
| o | 3.50 | 4.67 | 5.20 | 4.50 | 4.88 | 5.00 | 5.00 | 5.17 | 3.50 | 2.33 | 3.29 | 5.80 | 7.40 | 6.71 | 8.17 | 8.83 | 7.86 | 7.43 | 9.43 | 11.00 | 11.43 | 11.71 | 12.83 | 10.63 | 7.43 | 6.86 | 4.75 | 5.40 | 6.50 | 4.00 | 3.29 | 6.60 | 52.88 |
| i | 1.17 | 1.33 | 0.80 | 0.67 | 0.75 | 0.50 | 0.14 | 0.33 | 0.38 | 0.17 | 0.43 | 0.00 | 0.00 | 0.29 | 0.67 | 2.67 | 3.29 | 3.71 | 2.29 | 2.86 | 2.86 | 2.57 | 0.83 | 1.25 | 1.00 | 0.71 | 0.63 | 1.20 | 1.00 | 2.38 | 2.29 | 1.26 | 10.12 |
| c | 0.00 | 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 | 0.33 | 0.00 | 0.29 | 0.14 | 0.71 | 1.00 | 0.43 | 0.71 | 1.00 | 0.75 | 1.00 | 0.00 | 0.13 | 0.00 | 0.00 | 0.38 | 0.00 | 0.23 | 1.82 |
| CV | 135.83 | 131.67 | 144.80 | 122.00 | 99.13 | 106.50 | 115.14 | 111.83 | 104.75 | 83.67 | 84.86 | 77.20 | 90.00 | 125.14 | 202.17 | 278.00 | 306.29 | 314.43 | 308.00 | 357.43 | 358.43 | 351.71 | 287.50 | 304.88 | 261.71 | 156.71 | 153.13 | 175.00 | 168.83 | 199.13 | 174.43 | 190.01 | 100 |
| CVn | 86.67 | 78.33 | 65.20 | 57.17 | 57.88 | 64.50 | 66.14 | 71.67 | 68.50 | 54.00 | 43.57 | 25.20 | 14.80 | 18.00 | 27.50 | 59.00 | 83.57 | 109.00 | 116.57 | 125.29 | 138.14 | 127.57 | 106.67 | 133.50 | 117.43 | 98.14 | 93.63 | 75.60 | 76.50 | 71.38 | 74.71 | 77.61 | 40.84 |
| CVs | 49.17 | 53.33 | 79.60 | 64.83 | 41.25 | 42.00 | 49.00 | 40.17 | 36.25 | 29.67 | 41.29 | 52.00 | 75.20 | 107.14 | 174.67 | 219.00 | 222.71 | 205.43 | 191.43 | 232.14 | 220.29 | 224.14 | 180.83 | 171.38 | 144.29 | 58.57 | 59.50 | 99.40 | 92.33 | 127.75 | 99.71 | 112.40 | 59.16 |
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