Statistics of sunspot activity
February, 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 | Average | % |
| W | 298.80 | 301.50 | 295.80 | 175.60 | 174.71 | 168.67 | 144.17 | 158.20 | 191.29 | 181.60 | 189.50 | 206.00 | 227.00 | 228.67 | 244.43 | 238.33 | 203.67 | 267.71 | 291.14 | 272.80 | 356.83 | 344.20 | 311.67 | 368.00 | 275.25 | 257.13 | 261.40 | 190.33 | 243.73 | 100 |
| Wn | 62.20 | 68.50 | 54.20 | 32.20 | 48.14 | 52.33 | 55.33 | 70.60 | 101.86 | 90.80 | 92.75 | 97.50 | 96.00 | 86.67 | 80.71 | 63.67 | 38.00 | 49.00 | 58.71 | 68.00 | 95.17 | 94.00 | 73.67 | 75.00 | 68.25 | 74.50 | 77.60 | 59.33 | 70.88 | 29.08 |
| Ws | 236.60 | 233.00 | 241.60 | 143.40 | 126.57 | 116.33 | 88.83 | 87.60 | 89.43 | 90.80 | 96.75 | 108.50 | 131.00 | 142.00 | 163.71 | 174.67 | 165.67 | 218.71 | 232.43 | 204.80 | 261.67 | 250.20 | 238.00 | 293.00 | 207.00 | 182.63 | 183.80 | 131.00 | 172.85 | 70.92 |
| n | 11.80 | 13.00 | 13.80 | 8.40 | 9.00 | 9.83 | 9.17 | 9.60 | 9.00 | 9.40 | 10.75 | 11.00 | 11.50 | 12.50 | 13.43 | 13.67 | 12.50 | 14.86 | 14.71 | 13.20 | 15.17 | 14.60 | 13.00 | 12.00 | 12.38 | 10.88 | 11.80 | 9.67 | 11.81 | 100 |
| A | 1.00 | 1.50 | 2.00 | 0.80 | 0.71 | 0.83 | 1.17 | 2.20 | 1.29 | 1.00 | 2.00 | 3.50 | 1.67 | 1.33 | 1.00 | 1.33 | 3.17 | 3.00 | 2.29 | 1.20 | 1.00 | 2.00 | 2.67 | 1.40 | 1.50 | 0.75 | 0.80 | 1.50 | 1.59 | 13.49 |
| B | 1.40 | 2.00 | 1.20 | 0.20 | 0.00 | 0.33 | 1.00 | 0.40 | 0.29 | 1.00 | 1.50 | 1.75 | 1.67 | 2.00 | 1.71 | 2.33 | 1.67 | 2.00 | 3.00 | 1.80 | 1.33 | 2.60 | 1.33 | 2.60 | 2.63 | 2.63 | 2.40 | 1.83 | 1.59 | 13.49 |
| C | 1.60 | 0.25 | 1.20 | 1.20 | 0.14 | 1.50 | 1.83 | 1.80 | 2.14 | 2.00 | 3.25 | 2.00 | 3.83 | 5.17 | 6.29 | 4.33 | 3.33 | 3.71 | 1.71 | 4.00 | 4.33 | 2.40 | 3.00 | 2.40 | 2.63 | 3.25 | 2.60 | 1.50 | 2.62 | 22.20 |
| D | 1.20 | 2.25 | 2.00 | 1.20 | 1.86 | 2.67 | 2.00 | 1.20 | 1.29 | 2.00 | 2.25 | 2.25 | 3.33 | 3.17 | 4.00 | 4.67 | 2.50 | 3.57 | 3.29 | 2.60 | 5.17 | 4.00 | 3.00 | 3.00 | 2.25 | 1.50 | 3.40 | 2.00 | 2.63 | 22.26 |
| E | 1.00 | 0.25 | 0.40 | 0.40 | 0.43 | 0.33 | 0.17 | 0.00 | 0.00 | 0.40 | 0.25 | 0.25 | 0.17 | 0.00 | 0.29 | 0.00 | 0.17 | 0.57 | 0.43 | 0.80 | 1.67 | 1.80 | 1.33 | 1.60 | 1.38 | 1.25 | 0.20 | 0.17 | 0.56 | 4.75 |
| F | 1.20 | 1.75 | 2.00 | 1.00 | 0.71 | 0.67 | 0.17 | 0.00 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.29 | 0.60 | 0.17 | 0.00 | 0.33 | 0.40 | 0.38 | 0.13 | 0.00 | 0.00 | 0.35 | 3.00 |
| G | 1.80 | 1.75 | 1.20 | 1.00 | 1.29 | 0.50 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.67 | 0.33 | 0.00 | 0.00 | 0.67 | 1.00 | 1.00 | 0.60 | 0.67 | 0.60 | 1.00 | 0.40 | 0.63 | 0.50 | 1.40 | 1.17 | 0.70 | 5.95 |
| H | 0.00 | 0.00 | 0.20 | 0.00 | 0.57 | 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 | 0.33 | 0.04 | 0.33 |
| I | 2.60 | 3.25 | 3.60 | 2.60 | 3.29 | 3.00 | 2.33 | 4.00 | 3.86 | 3.00 | 1.50 | 0.25 | 0.17 | 0.50 | 0.14 | 1.00 | 1.00 | 1.00 | 2.71 | 1.60 | 0.83 | 1.20 | 0.33 | 0.20 | 1.00 | 0.88 | 1.00 | 1.17 | 1.71 | 14.52 |
| x | 2.40 | 3.50 | 3.20 | 1.00 | 0.71 | 1.17 | 2.17 | 2.60 | 1.57 | 2.00 | 3.50 | 5.25 | 3.33 | 3.33 | 2.71 | 3.67 | 4.83 | 5.00 | 5.29 | 3.00 | 2.33 | 4.60 | 4.00 | 4.00 | 4.13 | 3.38 | 3.20 | 3.33 | 3.19 | 26.98 |
| r | 0.60 | 0.25 | 0.40 | 0.00 | 0.00 | 0.33 | 0.33 | 0.20 | 1.00 | 0.00 | 1.25 | 0.00 | 0.33 | 0.17 | 0.86 | 1.33 | 0.83 | 0.71 | 1.14 | 0.80 | 0.67 | 0.40 | 0.00 | 0.40 | 0.63 | 0.63 | 0.20 | 0.67 | 0.50 | 4.27 |
| s | 2.40 | 3.50 | 4.20 | 3.20 | 4.14 | 3.17 | 2.83 | 3.80 | 4.14 | 3.80 | 3.25 | 2.50 | 2.83 | 2.67 | 2.86 | 1.33 | 2.33 | 3.29 | 2.00 | 2.60 | 2.33 | 3.20 | 2.33 | 1.00 | 1.50 | 1.38 | 1.60 | 0.67 | 2.67 | 22.64 |
| a | 3.20 | 3.00 | 2.80 | 2.60 | 2.43 | 3.50 | 2.83 | 2.00 | 1.29 | 2.60 | 1.75 | 2.00 | 4.67 | 6.17 | 6.57 | 7.33 | 3.83 | 4.14 | 4.57 | 5.00 | 7.17 | 4.40 | 4.67 | 4.60 | 4.38 | 3.88 | 5.00 | 3.00 | 3.91 | 33.08 |
| h | 0.00 | 0.25 | 0.20 | 0.00 | 0.14 | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.38 | 0.00 | 0.20 | 0.00 | 0.06 | 0.54 |
| k | 3.20 | 2.50 | 3.00 | 1.60 | 1.57 | 1.67 | 1.00 | 0.80 | 1.00 | 1.00 | 1.00 | 1.00 | 0.33 | 0.17 | 0.43 | 0.00 | 0.67 | 1.71 | 1.71 | 1.80 | 2.50 | 2.00 | 2.00 | 2.00 | 1.38 | 1.63 | 1.60 | 2.00 | 1.47 | 12.48 |
| x | 3.60 | 4.75 | 5.80 | 3.40 | 4.57 | 3.83 | 3.50 | 6.20 | 5.14 | 4.00 | 3.50 | 3.75 | 1.83 | 1.83 | 1.14 | 2.33 | 4.17 | 4.00 | 5.00 | 2.80 | 1.83 | 3.20 | 3.00 | 1.60 | 2.50 | 1.63 | 1.80 | 3.00 | 3.35 | 28.35 |
| o | 5.60 | 6.25 | 5.40 | 3.20 | 3.29 | 4.83 | 4.83 | 2.80 | 2.86 | 4.40 | 6.25 | 6.50 | 8.83 | 10.17 | 11.43 | 11.33 | 8.17 | 9.43 | 8.29 | 8.80 | 11.17 | 8.80 | 7.33 | 7.60 | 7.75 | 7.00 | 9.00 | 5.83 | 7.04 | 59.63 |
| i | 1.40 | 1.25 | 1.80 | 1.60 | 0.86 | 1.00 | 0.83 | 0.60 | 0.86 | 1.00 | 1.00 | 0.75 | 0.83 | 0.50 | 0.86 | 0.00 | 0.17 | 1.43 | 1.29 | 1.20 | 1.50 | 2.00 | 2.00 | 2.80 | 2.13 | 2.13 | 1.00 | 0.83 | 1.20 | 10.16 |
| c | 1.20 | 0.75 | 0.80 | 0.20 | 0.29 | 0.17 | 0.00 | 0.00 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.40 | 0.67 | 0.60 | 0.67 | 0.00 | 0.00 | 0.13 | 0.00 | 0.00 | 0.22 | 1.86 |
| CV | 241.20 | 244.00 | 263.40 | 158.40 | 181.00 | 173.50 | 125.00 | 107.20 | 112.00 | 126.80 | 124.50 | 136.25 | 136.50 | 132.17 | 158.43 | 138.33 | 126.83 | 200.43 | 188.43 | 195.80 | 279.50 | 232.00 | 212.67 | 192.80 | 179.00 | 151.88 | 186.40 | 144.50 | 173.18 | 100 |
| CVn | 37.60 | 31.00 | 37.00 | 25.20 | 64.29 | 60.17 | 51.67 | 57.20 | 58.14 | 57.60 | 77.00 | 91.75 | 75.17 | 60.50 | 71.14 | 50.00 | 21.33 | 23.86 | 27.57 | 35.60 | 79.00 | 71.20 | 49.33 | 35.00 | 30.63 | 37.25 | 57.40 | 22.17 | 49.85 | 28.78 |
| CVs | 203.60 | 213.00 | 226.40 | 133.20 | 116.71 | 113.33 | 73.33 | 50.00 | 53.86 | 69.20 | 47.50 | 44.50 | 61.33 | 71.67 | 87.29 | 88.33 | 105.50 | 176.57 | 160.86 | 160.20 | 200.50 | 160.80 | 163.33 | 157.80 | 148.38 | 114.63 | 129.00 | 122.33 | 123.33 | 71.22 |
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