Statistics of sunspot activity
January, 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 | 181.50 | 141.14 | 136.60 | 151.75 | 101.50 | 147.14 | 134.29 | 119.00 | 117.00 | 121.86 | 156.50 | 176.67 | 201.40 | 170.83 | 187.60 | 211.50 | 154.50 | 180.33 | 160.17 | 147.75 | 147.50 | 137.80 | 161.00 | 187.00 | 224.14 | 224.40 | 285.00 | 362.33 | 345.00 | 329.29 | 348.00 | 188.73 | 100 |
| Wn | 36.67 | 24.43 | 22.00 | 26.25 | 13.00 | 28.71 | 28.43 | 46.83 | 62.00 | 70.29 | 88.50 | 103.33 | 118.00 | 90.83 | 82.80 | 90.00 | 65.75 | 65.67 | 54.33 | 64.50 | 58.33 | 45.80 | 40.60 | 48.20 | 45.86 | 58.80 | 74.50 | 104.17 | 86.50 | 85.71 | 84.20 | 61.77 | 32.73 |
| Ws | 144.83 | 116.71 | 114.60 | 125.50 | 88.50 | 118.43 | 105.86 | 72.17 | 55.00 | 51.57 | 68.00 | 73.33 | 83.40 | 80.00 | 104.80 | 121.50 | 88.75 | 114.67 | 105.83 | 83.25 | 89.17 | 92.00 | 120.40 | 138.80 | 178.29 | 165.60 | 210.50 | 258.17 | 258.50 | 243.57 | 263.80 | 126.95 | 67.27 |
| n | 11.00 | 8.43 | 8.60 | 7.75 | 7.50 | 9.43 | 9.14 | 7.67 | 6.17 | 5.57 | 7.00 | 6.83 | 7.20 | 6.50 | 7.00 | 8.50 | 7.50 | 8.50 | 8.67 | 8.75 | 8.83 | 7.20 | 8.00 | 7.40 | 9.43 | 8.20 | 10.75 | 12.50 | 11.50 | 11.57 | 11.80 | 8.54 | 100 |
| A | 2.33 | 1.43 | 2.00 | 0.50 | 0.50 | 0.86 | 1.14 | 1.67 | 0.67 | 0.71 | 1.17 | 1.50 | 1.20 | 1.00 | 1.60 | 1.67 | 1.25 | 1.50 | 2.83 | 0.50 | 2.00 | 1.60 | 1.00 | 0.20 | 1.43 | 0.60 | 0.75 | 1.67 | 1.17 | 0.71 | 0.80 | 1.22 | 14.33 |
| B | 2.00 | 0.86 | 1.00 | 1.50 | 1.50 | 1.71 | 1.14 | 1.17 | 0.50 | 0.43 | 1.83 | 2.00 | 1.20 | 2.00 | 1.20 | 1.67 | 2.00 | 0.83 | 1.00 | 1.00 | 1.67 | 0.20 | 2.00 | 2.60 | 2.86 | 1.00 | 1.25 | 1.50 | 1.67 | 1.71 | 1.80 | 1.45 | 16.91 |
| C | 4.33 | 2.71 | 1.40 | 1.50 | 2.00 | 2.14 | 2.14 | 1.00 | 0.33 | 0.43 | 0.83 | 0.67 | 2.20 | 1.00 | 1.40 | 2.00 | 1.50 | 1.67 | 1.00 | 2.25 | 1.33 | 0.60 | 1.40 | 1.60 | 1.57 | 1.40 | 2.00 | 1.83 | 1.33 | 1.86 | 1.60 | 1.58 | 18.51 |
| D | 1.83 | 1.86 | 1.60 | 1.00 | 2.00 | 3.14 | 3.00 | 1.17 | 0.83 | 1.43 | 0.17 | 0.67 | 1.00 | 0.67 | 1.20 | 1.67 | 1.75 | 2.50 | 2.00 | 2.25 | 2.33 | 2.40 | 0.80 | 0.40 | 0.86 | 2.20 | 2.25 | 2.67 | 1.50 | 2.43 | 1.40 | 1.64 | 19.24 |
| E | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.17 | 0.17 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.33 | 0.67 | 0.50 | 0.17 | 0.40 | 0.00 | 0.40 | 0.29 | 0.40 | 0.50 | 1.33 | 2.17 | 1.43 | 1.40 | 0.35 | 4.11 |
| F | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.67 | 0.33 | 0.20 | 0.17 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.20 | 0.00 | 1.00 | 1.14 | 1.20 | 1.25 | 0.83 | 0.67 | 0.86 | 1.60 | 0.35 | 4.12 |
| G | 0.17 | 0.29 | 0.20 | 0.75 | 0.00 | 0.29 | 0.14 | 0.67 | 1.17 | 0.71 | 1.00 | 1.33 | 1.40 | 1.67 | 1.60 | 1.17 | 1.00 | 1.17 | 1.17 | 0.50 | 0.50 | 1.00 | 1.80 | 0.60 | 0.86 | 1.00 | 1.00 | 1.50 | 1.50 | 1.43 | 1.20 | 0.93 | 10.86 |
| H | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.29 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.17 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.14 | 0.40 | 0.08 | 0.94 |
| I | 0.33 | 1.29 | 2.40 | 2.25 | 1.50 | 1.29 | 1.29 | 1.50 | 2.50 | 1.57 | 1.33 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 1.25 | 0.17 | 0.40 | 1.00 | 0.60 | 0.43 | 0.40 | 1.50 | 1.17 | 1.50 | 1.00 | 1.60 | 0.94 | 10.98 |
| x | 4.33 | 2.29 | 3.00 | 2.00 | 2.00 | 2.57 | 2.29 | 2.83 | 1.17 | 1.14 | 3.00 | 3.50 | 2.40 | 3.00 | 2.80 | 3.33 | 3.25 | 2.33 | 3.83 | 1.50 | 3.67 | 1.80 | 3.00 | 2.80 | 4.29 | 1.60 | 2.00 | 3.17 | 2.83 | 2.43 | 2.60 | 2.67 | 31.24 |
| r | 0.33 | 0.43 | 0.20 | 0.25 | 0.00 | 0.14 | 0.57 | 0.17 | 0.50 | 0.57 | 0.67 | 0.00 | 0.00 | 0.33 | 0.20 | 0.33 | 0.25 | 1.00 | 0.33 | 1.25 | 0.17 | 0.00 | 0.40 | 1.00 | 0.00 | 0.20 | 0.50 | 0.67 | 0.17 | 0.57 | 0.40 | 0.37 | 4.38 |
| s | 1.67 | 1.71 | 2.00 | 3.50 | 5.00 | 2.71 | 2.71 | 2.17 | 1.67 | 1.00 | 0.33 | 0.17 | 1.00 | 0.17 | 0.20 | 0.17 | 0.00 | 0.83 | 0.33 | 0.50 | 0.33 | 1.00 | 1.20 | 0.80 | 1.00 | 1.40 | 1.75 | 2.50 | 2.33 | 2.00 | 2.00 | 1.42 | 16.67 |
| a | 4.67 | 4.00 | 3.40 | 2.00 | 0.50 | 4.00 | 2.86 | 0.83 | 1.33 | 1.14 | 1.00 | 1.33 | 2.60 | 1.17 | 2.40 | 2.83 | 2.25 | 2.50 | 2.00 | 3.75 | 3.17 | 2.40 | 1.20 | 0.80 | 1.57 | 2.20 | 3.25 | 3.00 | 2.67 | 2.57 | 2.20 | 2.31 | 27.03 |
| h | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.43 | 0.60 | 0.75 | 0.00 | 0.00 | 0.14 | 0.40 | 0.08 | 0.99 |
| k | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.57 | 1.67 | 1.50 | 1.71 | 2.00 | 1.83 | 1.20 | 1.83 | 1.40 | 1.83 | 1.75 | 1.83 | 2.00 | 1.75 | 1.50 | 2.00 | 2.20 | 2.00 | 2.14 | 2.20 | 2.50 | 3.17 | 3.50 | 3.86 | 4.20 | 1.68 | 19.69 |
| x | 2.67 | 2.71 | 4.40 | 2.75 | 2.00 | 2.14 | 2.71 | 3.50 | 3.17 | 2.29 | 2.50 | 1.83 | 1.20 | 1.00 | 1.60 | 1.67 | 1.25 | 2.00 | 2.83 | 2.25 | 2.33 | 2.40 | 2.00 | 0.80 | 1.86 | 1.00 | 2.50 | 2.83 | 2.67 | 1.86 | 2.80 | 2.24 | 26.25 |
| o | 7.83 | 5.29 | 3.80 | 4.50 | 5.50 | 7.14 | 6.43 | 3.67 | 2.50 | 2.71 | 3.83 | 4.50 | 5.80 | 5.33 | 5.00 | 5.83 | 5.00 | 5.50 | 5.00 | 5.25 | 5.17 | 3.60 | 6.00 | 5.20 | 6.14 | 5.20 | 6.50 | 7.33 | 5.67 | 6.43 | 5.00 | 5.25 | 61.41 |
| i | 0.50 | 0.43 | 0.40 | 0.50 | 0.00 | 0.14 | 0.00 | 0.33 | 0.50 | 0.57 | 0.67 | 0.50 | 0.20 | 0.17 | 0.40 | 0.83 | 1.25 | 1.00 | 0.83 | 1.25 | 1.33 | 1.20 | 0.00 | 1.00 | 1.14 | 1.60 | 1.50 | 1.17 | 1.83 | 1.86 | 2.80 | 0.84 | 9.78 |
| c | 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 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.29 | 0.40 | 0.25 | 1.17 | 1.33 | 1.43 | 1.20 | 0.22 | 2.57 |
| CV | 87.33 | 81.71 | 73.00 | 83.75 | 87.50 | 107.00 | 120.57 | 115.33 | 105.83 | 109.00 | 108.83 | 107.67 | 106.40 | 108.17 | 107.00 | 131.67 | 115.50 | 147.00 | 145.33 | 146.75 | 130.83 | 148.80 | 130.80 | 128.00 | 161.71 | 197.00 | 227.00 | 254.00 | 254.67 | 274.29 | 286.60 | 141.58 | 100 |
| CVn | 13.83 | 14.43 | 10.20 | 11.50 | 11.00 | 16.57 | 35.00 | 62.00 | 61.17 | 46.14 | 51.33 | 56.83 | 61.60 | 49.17 | 52.80 | 59.33 | 60.00 | 79.83 | 81.00 | 71.25 | 39.50 | 41.40 | 35.00 | 27.20 | 19.43 | 44.80 | 42.00 | 56.33 | 57.67 | 65.14 | 53.00 | 44.72 | 31.59 |
| CVs | 73.50 | 67.29 | 62.80 | 72.25 | 76.50 | 90.43 | 85.57 | 53.33 | 44.67 | 62.86 | 57.50 | 50.83 | 44.80 | 59.00 | 54.20 | 72.33 | 55.50 | 67.17 | 64.33 | 75.50 | 91.33 | 107.40 | 95.80 | 100.80 | 142.29 | 152.20 | 185.00 | 197.67 | 197.00 | 209.14 | 233.60 | 96.86 | 68.41 |
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