Statistics of sunspot activity
December, 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 | 146.33 | 131.57 | 174.40 | 147.86 | 169.71 | 211.17 | 245.17 | 235.83 | 302.67 | 289.80 | 267.00 | 229.50 | 225.67 | 240.20 | 206.57 | 158.40 | 155.71 | 147.20 | 174.75 | 151.80 | 146.17 | 162.00 | 181.00 | 166.00 | 210.50 | 176.00 | 183.50 | 174.00 | 168.50 | 143.83 | 118.50 | 188.43 | 100 |
| Wn | 39.00 | 36.57 | 61.00 | 62.57 | 79.00 | 108.17 | 136.33 | 114.67 | 130.33 | 113.00 | 108.25 | 82.67 | 72.67 | 85.60 | 80.00 | 54.60 | 56.43 | 53.40 | 31.75 | 14.80 | 9.33 | 10.40 | 4.80 | 0.00 | 3.67 | 2.40 | 0.00 | 0.00 | 2.67 | 7.00 | 12.00 | 50.74 | 26.93 |
| Ws | 107.33 | 95.00 | 113.40 | 85.29 | 90.71 | 103.00 | 108.83 | 121.17 | 172.33 | 176.80 | 158.75 | 146.83 | 153.00 | 154.60 | 126.57 | 103.80 | 99.29 | 93.80 | 143.00 | 137.00 | 136.83 | 151.60 | 176.20 | 166.00 | 206.83 | 173.60 | 183.50 | 174.00 | 165.83 | 136.83 | 106.50 | 137.69 | 73.07 |
| n | 9.17 | 8.29 | 10.00 | 8.00 | 7.86 | 8.50 | 9.83 | 9.83 | 12.17 | 12.40 | 11.50 | 8.83 | 8.83 | 10.60 | 10.43 | 7.40 | 7.29 | 8.60 | 10.75 | 9.20 | 8.50 | 6.60 | 6.00 | 6.57 | 7.67 | 6.60 | 5.50 | 4.71 | 4.83 | 4.50 | 4.75 | 8.25 | 100 |
| A | 2.00 | 3.29 | 1.80 | 1.14 | 0.71 | 0.83 | 1.67 | 1.33 | 0.83 | 1.00 | 1.00 | 0.50 | 0.50 | 2.00 | 2.57 | 1.00 | 0.86 | 1.40 | 1.50 | 1.20 | 2.50 | 1.00 | 0.60 | 0.57 | 0.83 | 0.20 | 0.33 | 0.43 | 0.50 | 0.17 | 1.00 | 1.14 | 13.79 |
| B | 2.67 | 0.86 | 2.40 | 0.86 | 0.14 | 0.83 | 1.00 | 0.33 | 0.83 | 2.00 | 1.25 | 0.50 | 0.67 | 1.20 | 1.29 | 0.20 | 0.57 | 1.80 | 2.00 | 2.60 | 0.17 | 0.60 | 0.40 | 0.43 | 0.50 | 0.60 | 0.00 | 0.29 | 0.33 | 0.33 | 0.00 | 0.89 | 10.81 |
| C | 1.33 | 1.00 | 1.20 | 0.86 | 1.57 | 2.17 | 2.00 | 2.00 | 4.17 | 2.60 | 2.00 | 1.83 | 1.00 | 1.80 | 2.00 | 2.60 | 1.71 | 0.80 | 2.25 | 1.40 | 1.17 | 0.40 | 0.80 | 1.00 | 2.67 | 1.20 | 0.67 | 0.29 | 0.17 | 0.33 | 0.50 | 1.47 | 17.79 |
| D | 2.17 | 2.86 | 3.00 | 2.86 | 3.14 | 2.33 | 1.67 | 1.83 | 1.67 | 3.00 | 2.75 | 1.00 | 1.83 | 1.40 | 1.43 | 1.80 | 1.71 | 1.80 | 3.25 | 3.20 | 2.33 | 2.60 | 2.40 | 2.00 | 1.17 | 0.80 | 1.00 | 1.29 | 1.17 | 1.00 | 1.00 | 1.98 | 24.03 |
| E | 0.00 | 0.00 | 0.20 | 0.71 | 0.71 | 1.17 | 2.17 | 1.83 | 2.83 | 2.40 | 1.50 | 1.00 | 0.67 | 0.40 | 0.57 | 0.60 | 0.57 | 0.20 | 0.25 | 0.00 | 0.00 | 0.20 | 0.20 | 0.29 | 0.17 | 0.60 | 0.67 | 0.29 | 0.67 | 0.67 | 0.00 | 0.69 | 8.42 |
| F | 0.00 | 0.00 | 0.20 | 0.14 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.50 | 0.83 | 1.00 | 1.00 | 0.29 | 0.00 | 0.00 | 0.40 | 0.00 | 0.40 | 0.00 | 0.20 | 0.60 | 0.86 | 1.17 | 1.20 | 1.33 | 1.43 | 1.17 | 1.67 | 1.75 | 0.53 | 6.44 |
| G | 0.00 | 0.14 | 0.20 | 0.57 | 0.14 | 0.33 | 0.33 | 1.67 | 0.50 | 0.60 | 2.00 | 2.17 | 1.83 | 1.60 | 1.29 | 1.20 | 1.57 | 1.40 | 1.25 | 0.40 | 0.83 | 1.00 | 1.00 | 1.43 | 0.83 | 1.00 | 0.67 | 0.57 | 0.83 | 0.33 | 0.25 | 0.90 | 10.93 |
| H | 0.00 | 0.00 | 0.20 | 0.14 | 0.14 | 0.00 | 0.17 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.29 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.04 | 0.51 |
| I | 1.00 | 0.14 | 0.80 | 0.71 | 1.14 | 0.83 | 0.83 | 0.83 | 1.17 | 0.60 | 0.50 | 1.00 | 1.33 | 1.20 | 1.00 | 0.00 | 0.00 | 0.80 | 0.25 | 0.00 | 1.50 | 0.40 | 0.00 | 0.00 | 0.33 | 1.00 | 0.83 | 0.14 | 0.00 | 0.00 | 0.25 | 0.60 | 7.28 |
| x | 4.67 | 4.14 | 4.20 | 2.00 | 0.86 | 1.67 | 2.67 | 1.67 | 1.67 | 3.00 | 2.25 | 1.00 | 1.17 | 3.20 | 3.86 | 1.20 | 1.43 | 3.20 | 3.50 | 3.80 | 2.67 | 1.60 | 1.00 | 1.00 | 1.33 | 0.80 | 0.33 | 0.71 | 0.83 | 0.50 | 1.00 | 2.03 | 24.60 |
| r | 0.17 | 0.43 | 0.40 | 0.14 | 0.14 | 0.33 | 0.00 | 0.17 | 0.33 | 0.60 | 0.25 | 0.17 | 0.00 | 0.60 | 0.14 | 0.20 | 0.43 | 0.00 | 0.00 | 0.20 | 0.17 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 2.10 |
| s | 1.17 | 0.71 | 2.20 | 1.71 | 3.29 | 1.33 | 1.17 | 1.17 | 3.50 | 2.80 | 0.50 | 1.00 | 1.00 | 1.60 | 2.43 | 1.20 | 0.00 | 0.60 | 1.00 | 0.80 | 1.67 | 0.20 | 0.40 | 0.57 | 1.00 | 1.80 | 1.17 | 0.57 | 0.17 | 0.67 | 0.50 | 1.22 | 14.82 |
| a | 2.00 | 1.57 | 1.20 | 2.57 | 2.00 | 4.00 | 4.50 | 4.83 | 4.00 | 3.00 | 5.00 | 3.67 | 3.67 | 2.40 | 2.14 | 3.00 | 3.00 | 2.20 | 4.25 | 2.60 | 2.00 | 2.00 | 1.80 | 2.14 | 2.00 | 1.00 | 0.83 | 0.43 | 1.00 | 0.33 | 1.75 | 2.48 | 30.07 |
| h | 0.17 | 0.29 | 0.40 | 0.43 | 0.43 | 0.00 | 0.33 | 0.17 | 0.17 | 0.40 | 0.00 | 0.17 | 0.17 | 0.60 | 0.29 | 0.40 | 0.57 | 0.20 | 0.00 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.19 | 2.32 |
| k | 1.00 | 1.14 | 1.60 | 1.14 | 1.14 | 1.17 | 1.17 | 1.83 | 2.50 | 2.60 | 3.50 | 2.83 | 2.83 | 2.20 | 1.57 | 1.40 | 1.86 | 2.40 | 2.00 | 1.60 | 2.00 | 2.80 | 2.80 | 2.86 | 2.83 | 2.60 | 3.00 | 3.00 | 2.83 | 3.00 | 1.50 | 2.15 | 26.09 |
| x | 3.00 | 3.43 | 2.80 | 2.00 | 2.00 | 1.67 | 2.67 | 2.17 | 2.17 | 1.60 | 1.50 | 1.50 | 1.83 | 3.20 | 3.57 | 1.00 | 1.14 | 2.20 | 1.75 | 1.20 | 4.00 | 1.60 | 0.60 | 0.57 | 1.17 | 1.20 | 1.17 | 0.57 | 0.50 | 0.17 | 1.25 | 1.78 | 21.58 |
| o | 5.17 | 3.86 | 6.00 | 4.71 | 4.43 | 5.00 | 4.83 | 5.33 | 6.67 | 7.40 | 7.75 | 5.33 | 5.33 | 5.60 | 5.57 | 5.40 | 5.43 | 5.80 | 8.50 | 7.00 | 3.67 | 3.60 | 3.40 | 4.14 | 4.33 | 3.20 | 2.00 | 1.71 | 2.17 | 1.50 | 1.50 | 4.72 | 57.23 |
| i | 1.00 | 1.00 | 1.20 | 1.00 | 1.00 | 1.33 | 2.00 | 1.67 | 2.83 | 3.40 | 2.00 | 1.83 | 1.50 | 1.20 | 0.86 | 0.80 | 0.71 | 0.60 | 0.50 | 1.00 | 0.83 | 1.00 | 1.20 | 0.57 | 1.00 | 0.80 | 1.83 | 2.00 | 1.83 | 2.50 | 2.00 | 1.39 | 16.82 |
| c | 0.00 | 0.00 | 0.00 | 0.29 | 0.43 | 0.50 | 0.33 | 0.67 | 0.50 | 0.00 | 0.25 | 0.17 | 0.17 | 0.60 | 0.43 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.80 | 1.29 | 1.17 | 1.40 | 0.50 | 0.43 | 0.33 | 0.33 | 0.00 | 0.36 | 4.37 |
| CV | 101.67 | 111.86 | 153.20 | 154.57 | 165.43 | 141.67 | 161.33 | 196.17 | 235.17 | 245.00 | 249.75 | 207.67 | 209.83 | 203.00 | 165.29 | 149.60 | 159.86 | 160.80 | 170.00 | 145.60 | 139.33 | 165.80 | 175.40 | 189.00 | 184.83 | 192.00 | 173.33 | 163.00 | 158.50 | 164.50 | 112.00 | 171.13 | 100 |
| CVn | 15.17 | 27.00 | 70.20 | 72.86 | 85.29 | 79.67 | 94.17 | 108.33 | 106.33 | 81.40 | 77.25 | 63.83 | 56.67 | 63.40 | 56.86 | 48.60 | 57.71 | 50.60 | 19.25 | 2.40 | 0.83 | 1.40 | 0.60 | 0.00 | 0.33 | 0.20 | 0.00 | 0.00 | 1.33 | 0.83 | 3.50 | 40.19 | 23.49 |
| CVs | 86.50 | 84.86 | 83.00 | 81.71 | 80.14 | 62.00 | 67.17 | 87.83 | 128.83 | 163.60 | 172.50 | 143.83 | 153.17 | 139.60 | 108.43 | 101.00 | 102.14 | 110.20 | 150.75 | 143.20 | 138.50 | 164.40 | 174.80 | 189.00 | 184.50 | 191.80 | 173.33 | 163.00 | 157.17 | 163.67 | 108.50 | 130.94 | 76.51 |
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