Statistics of sunspot activity
February, 1990
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 | 223.00 | 223.80 | 174.00 | 155.43 | 115.50 | 96.33 | 104.75 | 128.50 | 118.50 | 99.57 | 92.71 | 95.83 | 117.40 | 101.17 | 104.17 | 62.63 | 63.20 | 87.00 | 135.43 | 179.83 | 178.80 | 247.33 | 279.71 | 327.83 | 286.83 | 279.80 | 272.20 | 259.20 | 164.66 | 100 |
| Wn | 139.67 | 136.40 | 130.50 | 124.86 | 91.00 | 59.00 | 66.00 | 73.25 | 69.00 | 67.00 | 64.00 | 74.17 | 91.20 | 76.83 | 66.33 | 41.75 | 37.40 | 32.29 | 54.00 | 71.83 | 62.20 | 78.67 | 97.29 | 120.00 | 110.00 | 114.80 | 107.40 | 101.20 | 84.22 | 51.15 |
| Ws | 83.33 | 87.40 | 43.50 | 30.57 | 24.50 | 37.33 | 38.75 | 55.25 | 49.50 | 32.57 | 28.71 | 21.67 | 26.20 | 24.33 | 37.83 | 20.88 | 25.80 | 54.71 | 81.43 | 108.00 | 116.60 | 168.67 | 182.43 | 207.83 | 176.83 | 165.00 | 164.80 | 158.00 | 80.44 | 48.85 |
| n | 12.17 | 12.20 | 9.83 | 9.29 | 5.83 | 5.00 | 6.50 | 9.00 | 8.33 | 6.86 | 6.14 | 5.67 | 7.60 | 6.67 | 7.00 | 4.38 | 5.00 | 7.00 | 9.14 | 9.83 | 8.80 | 11.50 | 11.86 | 14.00 | 14.50 | 14.60 | 14.00 | 12.20 | 9.10 | 100 |
| A | 0.67 | 2.00 | 1.17 | 1.86 | 0.83 | 0.00 | 0.50 | 1.25 | 0.50 | 0.86 | 1.29 | 1.17 | 2.20 | 3.17 | 2.83 | 1.75 | 2.00 | 1.86 | 2.29 | 1.50 | 1.20 | 2.33 | 1.00 | 2.33 | 1.83 | 1.20 | 1.60 | 1.40 | 1.52 | 16.70 |
| B | 2.17 | 1.60 | 0.50 | 0.71 | 0.50 | 1.17 | 1.00 | 1.75 | 2.83 | 2.43 | 1.14 | 1.33 | 2.60 | 1.50 | 2.17 | 0.75 | 0.20 | 1.71 | 2.00 | 2.00 | 1.40 | 2.33 | 1.29 | 1.67 | 1.33 | 2.40 | 2.00 | 1.40 | 1.57 | 17.22 |
| C | 2.67 | 2.80 | 2.33 | 2.57 | 2.00 | 2.00 | 1.75 | 2.50 | 2.17 | 2.00 | 2.29 | 1.83 | 1.20 | 0.83 | 1.00 | 1.00 | 1.40 | 0.86 | 1.43 | 2.17 | 1.20 | 1.83 | 2.43 | 2.17 | 2.67 | 3.20 | 1.40 | 2.60 | 1.94 | 21.30 |
| D | 3.83 | 3.40 | 3.00 | 2.43 | 2.00 | 0.83 | 1.25 | 1.75 | 1.33 | 0.71 | 0.29 | 0.17 | 0.80 | 0.67 | 0.83 | 0.63 | 0.00 | 0.00 | 0.57 | 2.17 | 2.40 | 2.17 | 3.57 | 2.17 | 2.33 | 1.80 | 3.60 | 2.80 | 1.70 | 18.63 |
| E | 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 | 0.86 | 1.17 | 1.00 | 0.83 | 1.00 | 1.50 | 1.50 | 1.60 | 1.00 | 0.60 | 0.39 | 4.34 |
| F | 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 | 0.20 | 0.33 | 1.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.07 | 0.80 |
| G | 1.50 | 1.40 | 0.50 | 0.00 | 0.00 | 0.33 | 0.50 | 0.00 | 0.00 | 0.00 | 0.14 | 0.00 | 0.40 | 0.50 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.67 | 0.71 | 2.00 | 1.83 | 0.80 | 0.40 | 0.60 | 0.46 | 5.04 |
| H | 0.00 | 0.40 | 0.83 | 0.14 | 0.00 | 0.00 | 0.00 | 1.00 | 0.67 | 0.43 | 0.29 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.86 | 0.71 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.00 | 0.22 | 2.39 |
| I | 1.00 | 0.60 | 1.50 | 1.57 | 0.50 | 0.67 | 1.50 | 0.75 | 0.83 | 0.43 | 0.71 | 1.17 | 0.40 | 0.00 | 0.00 | 0.25 | 1.00 | 1.71 | 1.29 | 0.67 | 1.00 | 1.00 | 0.86 | 2.17 | 2.83 | 3.60 | 3.80 | 2.80 | 1.24 | 13.58 |
| x | 2.83 | 3.60 | 1.67 | 2.57 | 1.33 | 1.17 | 1.50 | 3.00 | 3.33 | 3.29 | 2.43 | 2.50 | 4.80 | 4.67 | 5.00 | 2.50 | 2.20 | 3.57 | 4.29 | 3.50 | 2.60 | 4.67 | 2.29 | 4.00 | 3.17 | 3.60 | 3.60 | 2.80 | 3.09 | 33.92 |
| r | 0.33 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 1.25 | 0.67 | 0.86 | 0.86 | 0.67 | 0.80 | 0.00 | 0.00 | 0.00 | 0.00 | 0.43 | 0.14 | 0.50 | 0.20 | 0.33 | 0.43 | 1.00 | 0.33 | 0.40 | 0.40 | 0.00 | 0.37 | 4.04 |
| s | 1.83 | 2.00 | 2.83 | 2.86 | 1.50 | 0.50 | 1.25 | 0.25 | 1.67 | 0.71 | 0.71 | 0.83 | 0.00 | 0.33 | 0.17 | 0.75 | 1.20 | 1.43 | 1.57 | 1.33 | 1.60 | 1.67 | 2.57 | 3.50 | 3.50 | 4.00 | 4.20 | 2.80 | 1.70 | 18.66 |
| a | 6.17 | 5.00 | 4.50 | 3.71 | 3.00 | 3.33 | 3.25 | 3.25 | 1.67 | 1.00 | 1.29 | 0.67 | 1.00 | 0.67 | 0.83 | 0.25 | 0.60 | 0.57 | 1.71 | 3.33 | 3.40 | 3.00 | 4.71 | 4.00 | 5.33 | 4.60 | 3.60 | 4.20 | 2.81 | 30.86 |
| h | 0.00 | 0.40 | 0.17 | 0.14 | 0.00 | 0.00 | 0.00 | 0.25 | 0.17 | 0.00 | 0.00 | 0.00 | 0.40 | 0.50 | 0.50 | 0.38 | 0.40 | 0.29 | 0.00 | 0.00 | 0.20 | 0.17 | 0.14 | 0.00 | 0.00 | 0.20 | 0.60 | 0.40 | 0.19 | 2.08 |
| k | 1.00 | 1.00 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.83 | 1.00 | 0.86 | 1.00 | 0.60 | 0.50 | 0.50 | 0.50 | 0.60 | 0.71 | 1.43 | 1.17 | 0.80 | 1.67 | 1.71 | 1.50 | 2.17 | 1.80 | 1.60 | 2.00 | 0.95 | 10.44 |
| x | 1.67 | 3.00 | 3.50 | 3.57 | 1.33 | 0.67 | 2.00 | 3.00 | 2.00 | 1.71 | 2.29 | 2.33 | 2.60 | 3.17 | 2.83 | 2.00 | 3.40 | 4.43 | 4.29 | 2.33 | 2.20 | 3.33 | 1.86 | 4.50 | 4.67 | 4.80 | 5.60 | 4.20 | 2.97 | 32.67 |
| o | 10.00 | 8.00 | 6.33 | 5.00 | 3.50 | 3.67 | 3.25 | 6.00 | 6.17 | 5.14 | 3.43 | 3.00 | 5.00 | 3.17 | 3.83 | 2.38 | 1.60 | 2.57 | 3.86 | 5.50 | 4.80 | 6.17 | 7.14 | 7.83 | 7.50 | 7.80 | 6.60 | 6.40 | 5.20 | 57.14 |
| i | 0.50 | 1.20 | 0.00 | 0.71 | 1.00 | 0.67 | 1.25 | 0.00 | 0.17 | 0.00 | 0.43 | 0.33 | 0.00 | 0.33 | 0.33 | 0.00 | 0.00 | 0.00 | 0.71 | 1.83 | 1.80 | 1.67 | 2.43 | 0.83 | 0.83 | 1.20 | 1.00 | 1.40 | 0.74 | 8.10 |
| c | 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 | 0.29 | 0.17 | 0.00 | 0.33 | 0.43 | 0.83 | 1.50 | 0.80 | 0.80 | 0.20 | 0.19 | 2.10 |
| CV | 175.33 | 177.40 | 140.67 | 98.29 | 67.00 | 48.00 | 67.00 | 104.75 | 94.00 | 70.43 | 62.86 | 59.67 | 68.20 | 65.67 | 66.50 | 53.00 | 58.20 | 64.00 | 109.00 | 132.33 | 133.20 | 165.67 | 218.14 | 208.00 | 244.17 | 214.00 | 224.00 | 200.40 | 121.07 | 100 |
| CVn | 101.83 | 105.20 | 93.83 | 80.43 | 55.50 | 38.83 | 54.75 | 76.50 | 67.67 | 59.43 | 54.86 | 56.50 | 65.20 | 63.00 | 62.17 | 48.63 | 49.00 | 42.57 | 36.43 | 45.00 | 40.00 | 56.50 | 84.71 | 84.50 | 91.00 | 76.20 | 90.00 | 93.00 | 66.90 | 55.26 |
| CVs | 73.50 | 72.20 | 46.83 | 17.86 | 11.50 | 9.17 | 12.25 | 28.25 | 26.33 | 11.00 | 8.00 | 3.17 | 3.00 | 2.67 | 4.33 | 4.38 | 9.20 | 21.43 | 72.57 | 87.33 | 93.20 | 109.17 | 133.43 | 123.50 | 153.17 | 137.80 | 134.00 | 107.40 | 54.17 | 44.74 |
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