Statistics of sunspot activity
January, 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 | 29 | 30 | 31 | Average | % |
| W | 152.14 | 185.33 | 176.40 | 153.25 | 174.20 | 164.20 | 145.50 | . | 89.00 | 149.67 | 149.86 | 199.67 | 184.00 | 166.33 | 174.67 | 172.25 | 210.67 | 213.00 | 259.50 | 309.50 | 261.00 | 245.60 | 250.83 | 267.20 | 243.80 | 254.00 | 259.00 | 269.00 | 239.50 | 236.14 | 245.60 | 206.69 | 100 |
| Wn | 68.29 | 84.33 | 71.00 | 68.25 | 91.00 | 82.80 | 64.67 | . | 23.50 | 36.17 | 28.00 | 51.67 | 58.25 | 69.17 | 99.83 | 108.75 | 115.33 | 106.60 | 109.75 | 127.67 | 104.00 | 85.60 | 65.83 | 53.00 | 57.00 | 76.75 | 121.80 | 136.40 | 134.00 | 144.86 | 149.60 | 86.46 | 41.83 |
| Ws | 83.86 | 101.00 | 105.40 | 85.00 | 83.20 | 81.40 | 80.83 | . | 65.50 | 113.50 | 121.86 | 148.00 | 125.75 | 97.17 | 74.83 | 63.50 | 95.33 | 106.40 | 149.75 | 181.83 | 157.00 | 160.00 | 185.00 | 214.20 | 186.80 | 177.25 | 137.20 | 132.60 | 105.50 | 91.29 | 96.00 | 120.23 | 58.17 |
| n | 6.71 | 9.00 | 10.20 | 8.50 | 8.20 | 9.40 | 8.17 | . | 7.00 | 8.67 | 8.57 | 12.67 | 11.38 | 10.33 | 10.17 | 10.00 | 11.00 | 12.20 | 13.50 | 14.50 | 13.00 | 12.20 | 13.00 | 13.80 | 12.80 | 10.50 | 13.80 | 13.80 | 12.00 | 12.43 | 12.20 | 10.99 | 100 |
| A | 0.71 | 0.50 | 1.20 | 1.13 | 0.20 | 1.60 | 0.33 | . | 0.00 | 0.33 | 0.86 | 0.83 | 0.75 | 0.50 | 0.33 | 1.50 | 0.83 | 2.20 | 2.50 | 1.50 | 0.67 | 0.80 | 1.33 | 2.60 | 2.60 | 1.50 | 2.20 | 2.20 | 1.75 | 1.71 | 0.60 | 1.19 | 10.85 |
| B | 0.29 | 1.17 | 1.80 | 1.25 | 1.60 | 1.60 | 1.33 | . | 0.00 | 1.17 | 1.43 | 0.83 | 1.00 | 1.33 | 2.00 | 1.75 | 1.33 | 1.00 | 1.25 | 2.17 | 1.17 | 1.60 | 3.17 | 4.00 | 3.60 | 2.75 | 4.20 | 4.00 | 3.75 | 4.86 | 1.40 | 1.96 | 17.83 |
| C | 1.29 | 1.67 | 2.60 | 1.50 | 2.00 | 1.60 | 2.00 | . | 1.00 | 2.00 | 1.57 | 3.67 | 3.75 | 1.83 | 1.17 | 1.75 | 3.33 | 2.00 | 2.25 | 2.67 | 2.17 | 2.00 | 2.17 | 2.60 | 2.00 | 1.00 | 3.20 | 3.40 | 3.00 | 3.00 | 3.20 | 2.25 | 20.44 |
| D | 2.29 | 3.17 | 2.20 | 2.50 | 2.80 | 2.60 | 2.17 | . | 1.00 | 2.33 | 1.71 | 2.50 | 2.13 | 1.00 | 0.83 | 0.00 | 0.50 | 2.60 | 3.50 | 2.50 | 2.67 | 0.40 | 1.50 | 1.40 | 0.60 | 1.50 | 1.00 | 1.40 | 1.00 | 0.71 | 3.20 | 1.79 | 16.29 |
| E | 0.86 | 1.17 | 0.40 | 0.25 | 0.00 | 0.00 | 0.67 | . | 1.00 | 0.17 | 0.43 | 0.17 | 0.13 | 0.67 | 1.17 | 1.75 | 1.83 | 1.20 | 0.75 | 0.33 | 0.67 | 1.20 | 1.17 | 0.00 | 0.40 | 0.25 | 0.20 | 0.20 | 0.50 | 0.43 | 0.40 | 0.61 | 5.56 |
| F | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | . | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.25 | 1.00 | 0.50 | 0.80 | 0.50 | 0.60 | 0.80 | 0.75 | 0.80 | 0.80 | 0.75 | 0.57 | 0.00 | 0.28 | 2.56 |
| G | 1.14 | 1.33 | 1.60 | 1.13 | 0.80 | 0.80 | 0.50 | . | 0.00 | 1.00 | 1.00 | 1.17 | 1.13 | 0.67 | 0.50 | 0.00 | 0.17 | 1.60 | 1.75 | 2.00 | 2.67 | 2.60 | 1.33 | 1.20 | 1.00 | 1.00 | 0.80 | 0.60 | 0.50 | 0.86 | 1.80 | 1.09 | 9.90 |
| H | 0.00 | 0.00 | 0.00 | 0.13 | 0.00 | 0.00 | 0.00 | . | 0.00 | 0.00 | 0.14 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.33 | 0.50 | 0.00 | 0.50 | 0.40 | 0.80 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.14 | 1.26 |
| I | 0.00 | 0.00 | 0.40 | 0.63 | 0.80 | 1.20 | 1.17 | . | 4.00 | 1.67 | 1.43 | 3.33 | 2.50 | 4.33 | 4.17 | 3.25 | 2.83 | 1.60 | 0.75 | 2.00 | 2.00 | 2.80 | 1.33 | 1.00 | 1.00 | 1.25 | 1.40 | 1.20 | 0.75 | 0.29 | 1.40 | 1.68 | 15.31 |
| x | 1.00 | 1.67 | 3.00 | 2.38 | 1.80 | 3.20 | 1.67 | . | 0.00 | 1.50 | 2.29 | 1.67 | 1.75 | 1.83 | 2.33 | 3.25 | 2.17 | 3.20 | 3.75 | 3.67 | 1.83 | 2.40 | 4.50 | 6.60 | 6.20 | 4.25 | 6.40 | 6.20 | 5.50 | 6.57 | 2.00 | 3.15 | 28.68 |
| r | 0.14 | 0.00 | 0.20 | 0.38 | 0.60 | 0.40 | 0.67 | . | 0.00 | 0.50 | 0.43 | 0.33 | 0.88 | 0.17 | 0.83 | 0.00 | 0.33 | 0.60 | 0.75 | 0.50 | 0.83 | 1.00 | 0.67 | 0.20 | 1.40 | 0.50 | 1.00 | 1.40 | 0.50 | 0.14 | 1.00 | 0.54 | 4.96 |
| s | 0.71 | 1.50 | 1.20 | 1.13 | 1.00 | 1.80 | 2.50 | . | 1.00 | 2.67 | 2.14 | 3.00 | 3.50 | 5.00 | 3.17 | 3.00 | 2.33 | 2.00 | 1.50 | 3.67 | 4.33 | 2.80 | 2.00 | 2.20 | 1.00 | 1.25 | 2.80 | 2.00 | 1.50 | 1.71 | 2.00 | 2.21 | 20.14 |
| a | 2.71 | 3.00 | 3.60 | 3.38 | 3.60 | 2.40 | 2.33 | . | 5.50 | 3.50 | 2.86 | 6.50 | 5.25 | 3.33 | 3.83 | 3.75 | 5.83 | 6.40 | 5.75 | 6.00 | 4.83 | 4.40 | 3.83 | 2.20 | 1.80 | 2.75 | 2.60 | 3.20 | 3.25 | 2.43 | 5.80 | 3.89 | 35.37 |
| h | 0.00 | 0.33 | 0.00 | 0.38 | 0.60 | 0.80 | 0.67 | . | 0.00 | 0.00 | 0.29 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 0.00 | 0.00 | 0.00 | 0.33 | 0.60 | 0.60 | 0.50 | 0.00 | 0.00 | 0.00 | 0.43 | 0.40 | 0.24 | 2.18 |
| k | 2.14 | 2.50 | 2.20 | 0.88 | 0.60 | 0.80 | 0.33 | . | 0.50 | 0.50 | 0.57 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 1.00 | 0.67 | 1.17 | 1.60 | 1.67 | 2.00 | 1.80 | 1.25 | 1.00 | 1.00 | 1.25 | 1.14 | 1.00 | 0.95 | 8.66 |
| x | 0.71 | 0.50 | 1.60 | 1.88 | 1.00 | 2.80 | 1.50 | . | 4.00 | 2.00 | 2.43 | 4.33 | 3.25 | 4.83 | 4.50 | 4.75 | 3.67 | 3.80 | 3.75 | 3.83 | 3.17 | 3.60 | 3.17 | 4.00 | 4.40 | 3.25 | 3.60 | 3.40 | 2.50 | 2.00 | 2.20 | 3.01 | 27.43 |
| o | 4.00 | 6.83 | 7.40 | 6.13 | 6.00 | 5.20 | 5.33 | . | 2.00 | 5.83 | 5.57 | 7.33 | 7.75 | 4.83 | 4.33 | 3.25 | 4.83 | 7.20 | 8.50 | 8.67 | 8.17 | 6.40 | 7.50 | 8.80 | 7.00 | 6.25 | 8.60 | 9.40 | 8.00 | 9.14 | 9.20 | 6.65 | 60.50 |
| i | 1.86 | 1.50 | 1.20 | 0.50 | 1.00 | 1.40 | 1.33 | . | 1.00 | 0.83 | 0.57 | 1.00 | 0.38 | 0.67 | 1.33 | 2.00 | 2.33 | 1.20 | 1.25 | 2.00 | 1.50 | 2.00 | 2.17 | 1.00 | 1.00 | 1.00 | 1.60 | 1.00 | 1.50 | 1.29 | 0.80 | 1.27 | 11.59 |
| c | 0.14 | 0.17 | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | . | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.17 | 0.20 | 0.17 | 0.00 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.05 | 0.49 |
| CV | 159.29 | 210.83 | 171.60 | 133.88 | 134.00 | 144.40 | 131.17 | . | 93.00 | 122.00 | 121.14 | 174.83 | 124.75 | 112.83 | 103.17 | 91.25 | 126.67 | 145.20 | 210.00 | 196.67 | 221.50 | 196.60 | 192.67 | 184.40 | 167.00 | 150.75 | 136.60 | 134.20 | 133.25 | 141.00 | 189.00 | 151.79 | 100 |
| CVn | 71.57 | 99.50 | 97.80 | 65.00 | 88.80 | 86.40 | 75.17 | . | 39.50 | 35.50 | 26.00 | 52.17 | 39.63 | 47.00 | 59.83 | 51.50 | 66.33 | 59.40 | 83.00 | 66.67 | 81.33 | 60.60 | 51.67 | 32.20 | 44.20 | 48.75 | 53.00 | 67.00 | 75.75 | 91.00 | 112.60 | 64.30 | 42.36 |
| CVs | 87.71 | 111.33 | 73.80 | 68.88 | 45.20 | 58.00 | 56.00 | . | 53.50 | 86.50 | 95.14 | 122.67 | 85.13 | 65.83 | 43.33 | 39.75 | 60.33 | 85.80 | 127.00 | 130.00 | 140.17 | 136.00 | 141.00 | 152.20 | 122.80 | 102.00 | 83.60 | 67.20 | 57.50 | 50.00 | 76.40 | 87.49 | 57.64 |
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