Statistics of sunspot activity
October, 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 | 220.17 | 217.29 | 222.86 | 191.80 | 228.14 | 173.71 | 151.86 | 139.29 | 187.17 | 217.50 | 209.43 | 190.20 | 160.17 | 181.33 | 172.83 | 194.80 | 150.83 | 143.71 | 130.17 | 132.14 | 120.17 | 125.20 | 151.83 | 203.29 | 194.71 | 194.43 | 239.00 | 250.75 | 218.71 | 253.60 | 254.00 | 187.78 | 100 |
| Wn | 60.00 | 63.57 | 63.43 | 60.40 | 71.86 | 52.86 | 56.29 | 75.71 | 110.00 | 109.67 | 100.00 | 72.60 | 62.00 | 81.67 | 79.50 | 95.80 | 79.83 | 70.29 | 78.17 | 72.14 | 58.17 | 53.80 | 53.83 | 72.14 | 80.43 | 87.29 | 107.00 | 97.75 | 69.29 | 84.00 | 83.20 | 76.22 | 40.59 |
| Ws | 160.17 | 153.71 | 159.43 | 131.40 | 156.29 | 120.86 | 95.57 | 63.57 | 77.17 | 107.83 | 109.43 | 117.60 | 98.17 | 99.67 | 93.33 | 99.00 | 71.00 | 73.43 | 52.00 | 60.00 | 62.00 | 71.40 | 98.00 | 131.14 | 114.29 | 107.14 | 132.00 | 153.00 | 149.43 | 169.60 | 170.80 | 111.56 | 59.41 |
| n | 8.67 | 7.71 | 8.00 | 8.00 | 9.29 | 8.14 | 9.00 | 8.57 | 11.00 | 12.67 | 12.43 | 10.00 | 9.00 | 10.17 | 10.00 | 10.00 | 7.33 | 7.86 | 7.50 | 8.00 | 6.83 | 6.60 | 6.83 | 7.71 | 7.43 | 7.14 | 8.50 | 9.25 | 8.86 | 9.00 | 9.20 | 8.73 | 100 |
| A | 3.83 | 1.86 | 1.43 | 1.00 | 0.86 | 0.57 | 1.71 | 1.29 | 1.67 | 1.17 | 1.43 | 0.80 | 1.00 | 0.67 | 1.67 | 2.60 | 1.67 | 1.86 | 1.67 | 2.43 | 1.33 | 0.40 | 0.17 | 0.29 | 0.43 | 1.71 | 2.00 | 1.00 | 1.29 | 1.00 | 1.20 | 1.35 | 15.51 |
| B | 0.83 | 1.14 | 0.57 | 0.00 | 0.86 | 2.14 | 1.57 | 2.00 | 2.50 | 3.83 | 2.29 | 1.20 | 0.67 | 0.83 | 2.67 | 1.60 | 0.67 | 0.71 | 1.17 | 3.29 | 3.00 | 1.80 | 1.17 | 1.14 | 2.29 | 1.29 | 1.75 | 2.00 | 1.29 | 0.60 | 1.00 | 1.54 | 17.68 |
| C | 0.17 | 1.00 | 0.86 | 1.40 | 1.29 | 1.29 | 2.00 | 1.86 | 1.83 | 3.50 | 4.43 | 0.60 | 1.67 | 4.50 | 1.33 | 0.40 | 0.17 | 0.86 | 1.50 | 0.86 | 1.17 | 2.20 | 1.83 | 2.29 | 0.57 | 0.00 | 0.00 | 1.00 | 1.00 | 0.40 | 1.20 | 1.39 | 15.94 |
| D | 1.00 | 0.14 | 1.43 | 1.60 | 2.43 | 1.57 | 1.29 | 1.71 | 1.83 | 1.83 | 1.57 | 2.20 | 2.33 | 1.50 | 1.50 | 2.20 | 2.17 | 2.00 | 1.17 | 0.71 | 0.67 | 1.00 | 2.00 | 2.00 | 1.43 | 1.00 | 1.25 | 2.00 | 2.00 | 3.60 | 2.80 | 1.68 | 19.19 |
| E | 0.67 | 0.86 | 1.00 | 0.20 | 0.29 | 0.57 | 0.43 | 0.14 | 0.00 | 0.50 | 0.29 | 0.80 | 0.50 | 0.00 | 0.00 | 0.60 | 0.83 | 0.71 | 0.67 | 0.29 | 0.00 | 0.40 | 0.50 | 0.57 | 1.00 | 1.14 | 0.75 | 1.00 | 0.86 | 0.20 | 1.00 | 0.54 | 6.19 |
| F | 1.00 | 1.14 | 1.14 | 1.20 | 1.00 | 0.71 | 0.71 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.50 | 1.00 | 1.00 | 1.43 | 1.50 | 1.25 | 1.86 | 2.40 | 1.00 | 0.62 | 7.10 |
| G | 1.17 | 1.43 | 0.71 | 1.80 | 1.57 | 1.14 | 1.14 | 1.14 | 2.00 | 0.00 | 0.43 | 0.60 | 0.50 | 0.67 | 1.00 | 1.00 | 0.83 | 0.71 | 0.00 | 0.00 | 0.17 | 0.00 | 0.17 | 0.29 | 0.57 | 0.43 | 0.75 | 0.75 | 0.43 | 0.40 | 1.00 | 0.74 | 8.42 |
| H | 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 | 0.00 | 0.00 | 0.01 | 0.12 |
| I | 0.00 | 0.14 | 0.86 | 0.80 | 1.00 | 0.14 | 0.14 | 0.43 | 0.83 | 1.83 | 2.00 | 3.60 | 2.33 | 2.00 | 1.83 | 1.60 | 1.00 | 1.00 | 1.17 | 0.43 | 0.50 | 0.80 | 0.50 | 0.14 | 0.14 | 0.14 | 0.50 | 0.25 | 0.14 | 0.40 | 0.00 | 0.86 | 9.85 |
| x | 4.67 | 3.00 | 2.00 | 1.00 | 1.71 | 2.71 | 3.29 | 3.29 | 4.17 | 5.00 | 3.71 | 2.00 | 1.67 | 1.50 | 4.33 | 4.20 | 2.33 | 2.57 | 2.83 | 5.71 | 4.33 | 2.20 | 1.33 | 1.43 | 2.71 | 3.00 | 3.75 | 3.00 | 2.57 | 1.60 | 2.20 | 2.90 | 33.19 |
| r | 0.00 | 0.14 | 0.00 | 0.20 | 0.57 | 0.14 | 0.29 | 0.29 | 1.00 | 0.67 | 0.71 | 0.60 | 0.33 | 0.33 | 0.00 | 0.40 | 0.17 | 0.43 | 0.17 | 0.57 | 0.83 | 0.60 | 0.33 | 0.71 | 0.14 | 0.00 | 0.50 | 0.00 | 0.14 | 0.80 | 0.00 | 0.36 | 4.09 |
| s | 0.67 | 0.86 | 1.57 | 2.60 | 2.14 | 1.00 | 1.86 | 2.00 | 1.00 | 3.33 | 2.57 | 2.40 | 3.33 | 4.67 | 2.33 | 1.20 | 1.00 | 1.57 | 1.67 | 1.00 | 0.33 | 1.00 | 1.17 | 1.00 | 0.57 | 0.14 | 0.50 | 0.25 | 1.57 | 0.20 | 1.60 | 1.52 | 17.40 |
| a | 0.83 | 1.00 | 1.86 | 1.20 | 2.86 | 2.29 | 2.00 | 2.14 | 3.83 | 2.67 | 4.43 | 4.00 | 2.83 | 2.50 | 2.33 | 2.80 | 2.33 | 2.71 | 2.83 | 0.71 | 1.33 | 2.00 | 3.00 | 3.29 | 2.14 | 2.00 | 1.75 | 4.00 | 2.86 | 4.80 | 3.40 | 2.54 | 29.09 |
| h | 0.17 | 0.00 | 0.86 | 0.80 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 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 | 0.14 | 0.00 | 0.00 | 0.08 | 0.96 |
| k | 2.33 | 2.71 | 1.71 | 2.20 | 1.86 | 2.00 | 1.57 | 0.86 | 1.00 | 1.00 | 0.86 | 1.00 | 0.83 | 1.17 | 1.00 | 1.40 | 1.17 | 0.57 | 0.00 | 0.00 | 0.00 | 0.80 | 1.00 | 1.29 | 1.86 | 2.00 | 2.00 | 2.00 | 1.57 | 1.60 | 2.00 | 1.33 | 15.28 |
| x | 3.83 | 2.00 | 2.29 | 1.80 | 1.86 | 0.71 | 1.86 | 1.71 | 2.83 | 3.00 | 3.43 | 4.40 | 3.33 | 2.67 | 3.50 | 4.20 | 2.67 | 2.86 | 2.83 | 2.86 | 1.83 | 1.20 | 0.67 | 0.43 | 0.57 | 1.86 | 2.50 | 1.25 | 1.43 | 1.40 | 1.20 | 2.22 | 25.48 |
| o | 2.83 | 3.71 | 3.00 | 4.80 | 5.29 | 6.00 | 5.71 | 6.29 | 8.00 | 8.50 | 8.43 | 3.40 | 4.17 | 6.50 | 4.83 | 4.40 | 2.83 | 3.71 | 3.50 | 4.29 | 4.83 | 4.40 | 4.83 | 5.14 | 4.71 | 2.71 | 3.75 | 5.75 | 4.57 | 4.60 | 5.20 | 4.86 | 55.67 |
| i | 1.33 | 1.29 | 1.86 | 0.60 | 1.14 | 0.57 | 1.29 | 0.43 | 0.17 | 0.83 | 0.43 | 1.60 | 1.50 | 0.50 | 1.00 | 1.00 | 1.83 | 1.29 | 1.17 | 0.86 | 0.17 | 0.60 | 0.33 | 1.29 | 1.14 | 1.71 | 1.75 | 1.50 | 1.71 | 2.00 | 1.80 | 1.12 | 12.81 |
| c | 0.67 | 0.71 | 0.86 | 0.80 | 1.00 | 0.86 | 0.14 | 0.14 | 0.00 | 0.33 | 0.14 | 0.60 | 0.00 | 0.50 | 0.67 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 1.00 | 0.86 | 1.00 | 0.86 | 0.50 | 0.75 | 1.14 | 1.00 | 1.00 | 0.53 | 6.03 |
| CV | 160.00 | 166.14 | 189.57 | 212.80 | 196.14 | 159.71 | 143.00 | 113.43 | 132.83 | 135.17 | 134.00 | 150.40 | 133.33 | 146.00 | 120.17 | 137.80 | 131.33 | 107.00 | 72.17 | 41.71 | 34.17 | 80.40 | 122.17 | 144.71 | 151.43 | 149.71 | 154.00 | 176.50 | 183.57 | 194.00 | 199.60 | 141.06 | 100 |
| CVn | 39.83 | 49.43 | 61.86 | 69.80 | 60.43 | 63.29 | 65.86 | 72.43 | 69.33 | 61.83 | 48.57 | 45.00 | 39.17 | 46.17 | 35.67 | 43.20 | 47.17 | 38.86 | 40.33 | 18.14 | 12.83 | 20.20 | 31.17 | 47.14 | 53.29 | 52.57 | 54.75 | 51.50 | 36.00 | 46.80 | 61.80 | 47.88 | 33.95 |
| CVs | 120.17 | 116.71 | 127.71 | 143.00 | 135.71 | 96.43 | 77.14 | 41.00 | 63.50 | 73.33 | 85.43 | 105.40 | 94.17 | 99.83 | 84.50 | 94.60 | 84.17 | 68.14 | 31.83 | 23.57 | 21.33 | 60.20 | 91.00 | 97.57 | 98.14 | 97.14 | 99.25 | 125.00 | 147.57 | 147.20 | 137.80 | 93.18 | 66.05 |
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