Statistics of sunspot activity
April, 2002
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 | Average | % |
| W | 165.00 | 236.33 | 160.00 | 190.67 | 195.00 | 210.00 | 214.67 | 210.75 | 208.67 | 220.50 | 219.25 | 259.00 | 249.50 | 228.75 | 227.00 | 177.33 | 138.00 | 160.00 | 161.25 | 181.33 | 135.75 | 140.50 | 173.00 | 229.67 | 208.00 | 154.67 | 164.00 | 113.67 | 102.00 | 115.67 | 185.00 | 100 |
| Wn | 108.00 | 150.67 | 104.00 | 149.67 | 149.00 | 149.75 | 132.67 | 125.75 | 112.33 | 117.75 | 105.50 | 131.00 | 104.00 | 112.50 | 103.67 | 65.33 | 38.00 | 49.67 | 49.00 | 67.67 | 69.50 | 84.50 | 113.00 | 111.33 | 99.00 | 80.33 | 112.67 | 96.67 | 89.33 | 102.33 | 102.82 | 55.58 |
| Ws | 57.00 | 85.67 | 56.00 | 41.00 | 46.00 | 60.25 | 82.00 | 85.00 | 96.33 | 102.75 | 113.75 | 128.00 | 145.50 | 116.25 | 123.33 | 112.00 | 100.00 | 110.33 | 112.25 | 113.67 | 66.25 | 56.00 | 60.00 | 118.33 | 109.00 | 74.33 | 51.33 | 17.00 | 12.67 | 13.33 | 82.18 | 44.42 |
| n | 6.67 | 8.33 | 8.33 | 9.00 | 9.67 | 12.00 | 12.00 | 12.00 | 12.33 | 12.50 | 12.00 | 12.00 | 10.50 | 11.25 | 12.00 | 10.00 | 7.00 | 8.00 | 7.75 | 8.33 | 8.25 | 8.75 | 10.33 | 12.33 | 13.00 | 9.67 | 11.00 | 6.33 | 7.33 | 8.67 | 9.91 | 100 |
| A | 0.00 | 0.67 | 0.67 | 1.00 | 0.67 | 2.50 | 0.33 | 1.00 | 0.33 | 1.25 | 0.75 | 0.00 | 0.00 | 0.25 | 1.00 | 1.33 | 0.25 | 0.00 | 0.25 | 0.33 | 0.00 | 0.50 | 1.33 | 0.67 | 0.00 | 0.00 | 1.33 | 0.67 | 1.00 | 1.00 | 0.64 | 6.42 |
| B | 0.00 | 0.33 | 1.00 | 1.00 | 1.67 | 0.75 | 2.33 | 0.50 | 0.67 | 0.25 | 0.50 | 0.50 | 0.50 | 0.75 | 1.00 | 0.00 | 0.00 | 0.33 | 0.25 | 1.00 | 1.25 | 0.50 | 0.00 | 0.33 | 1.00 | 1.67 | 1.00 | 0.00 | 0.33 | 0.67 | 0.67 | 6.75 |
| C | 0.00 | 3.00 | 1.33 | 1.00 | 0.67 | 1.50 | 0.67 | 2.50 | 2.00 | 3.25 | 2.00 | 3.00 | 0.50 | 1.75 | 2.33 | 2.33 | 1.00 | 1.00 | 1.00 | 1.67 | 2.00 | 1.50 | 1.67 | 3.00 | 4.00 | 3.33 | 1.67 | 1.00 | 1.67 | 4.67 | 1.90 | 19.17 |
| D | 3.67 | 1.67 | 2.33 | 2.33 | 1.67 | 2.25 | 2.67 | 3.00 | 3.67 | 3.25 | 4.50 | 5.50 | 5.50 | 3.25 | 2.33 | 1.67 | 1.75 | 3.33 | 3.25 | 3.67 | 2.50 | 3.50 | 5.67 | 4.33 | 5.00 | 3.00 | 5.33 | 4.33 | 3.33 | 0.33 | 3.29 | 33.16 |
| E | 1.00 | 1.33 | 1.33 | 1.67 | 2.67 | 1.25 | 0.33 | 0.75 | 1.33 | 1.75 | 0.75 | 1.50 | 1.00 | 1.50 | 1.33 | 1.67 | 1.75 | 1.00 | 1.00 | 0.67 | 0.25 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.87 | 8.80 |
| F | 0.33 | 0.67 | 0.00 | 0.33 | 0.00 | 1.00 | 1.00 | 0.75 | 0.33 | 0.25 | 0.25 | 0.50 | 0.50 | 0.25 | 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 | 0.22 | 2.19 |
| G | 0.33 | 0.33 | 0.33 | 0.67 | 0.67 | 0.50 | 1.33 | 1.25 | 2.00 | 1.00 | 2.00 | 0.50 | 0.50 | 1.00 | 0.67 | 0.33 | 0.00 | 0.00 | 0.50 | 1.00 | 0.50 | 0.75 | 0.00 | 1.67 | 1.00 | 1.00 | 0.33 | 0.33 | 0.00 | 0.33 | 0.69 | 7.01 |
| H | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.33 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 0.00 | 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 | 0.06 | 0.56 |
| I | 1.33 | 0.33 | 1.33 | 1.00 | 1.67 | 2.00 | 3.00 | 2.00 | 2.00 | 1.50 | 1.25 | 0.50 | 1.50 | 2.50 | 3.00 | 2.33 | 2.25 | 2.33 | 1.50 | 0.00 | 1.75 | 2.00 | 1.67 | 2.00 | 2.00 | 0.67 | 1.33 | 0.00 | 1.00 | 1.67 | 1.58 | 15.95 |
| x | 0.00 | 1.00 | 1.67 | 2.00 | 2.33 | 3.25 | 2.67 | 1.50 | 1.00 | 1.50 | 1.25 | 0.50 | 0.50 | 1.00 | 2.00 | 1.33 | 0.25 | 0.33 | 0.50 | 1.33 | 1.25 | 1.00 | 1.33 | 1.00 | 1.00 | 1.67 | 2.33 | 0.67 | 1.33 | 1.67 | 1.31 | 13.17 |
| r | 0.33 | 1.00 | 0.00 | 0.00 | 0.33 | 0.25 | 0.33 | 0.50 | 0.33 | 0.00 | 0.00 | 0.50 | 0.50 | 0.00 | 0.67 | 0.33 | 0.00 | 0.33 | 0.00 | 0.00 | 0.50 | 1.00 | 0.67 | 0.67 | 1.00 | 1.67 | 1.33 | 0.33 | 0.33 | 0.33 | 0.44 | 4.46 |
| s | 1.00 | 1.67 | 2.00 | 2.00 | 2.00 | 2.50 | 3.33 | 6.00 | 5.67 | 5.75 | 5.75 | 3.00 | 2.00 | 5.50 | 4.67 | 4.00 | 3.50 | 3.67 | 3.00 | 2.00 | 2.25 | 3.75 | 4.33 | 4.00 | 5.00 | 3.00 | 2.67 | 4.00 | 3.67 | 5.33 | 3.57 | 35.99 |
| a | 3.33 | 2.33 | 2.00 | 2.00 | 2.67 | 3.75 | 3.67 | 2.50 | 4.33 | 4.50 | 4.25 | 7.00 | 5.00 | 3.00 | 3.00 | 3.00 | 2.25 | 3.00 | 3.00 | 4.67 | 4.25 | 2.75 | 3.33 | 6.33 | 6.00 | 3.00 | 3.67 | 1.33 | 2.00 | 1.33 | 3.44 | 34.73 |
| h | 0.33 | 0.33 | 1.33 | 1.33 | 0.33 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.25 | 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 | 0.14 | 1.40 |
| k | 1.67 | 2.00 | 1.33 | 1.67 | 2.00 | 2.25 | 2.00 | 1.25 | 1.00 | 0.75 | 0.50 | 1.00 | 2.50 | 1.75 | 1.67 | 1.33 | 1.00 | 0.67 | 1.25 | 0.33 | 0.00 | 0.25 | 0.67 | 0.33 | 0.00 | 0.33 | 1.00 | 0.00 | 0.00 | 0.00 | 1.02 | 10.26 |
| x | 1.33 | 1.00 | 2.00 | 2.00 | 2.33 | 4.75 | 3.67 | 3.25 | 2.33 | 2.75 | 2.00 | 0.50 | 2.00 | 2.75 | 4.00 | 4.00 | 2.50 | 2.33 | 1.75 | 0.33 | 1.75 | 2.50 | 3.00 | 2.67 | 2.00 | 0.67 | 2.67 | 0.67 | 2.00 | 2.67 | 2.27 | 22.93 |
| o | 3.33 | 5.00 | 4.33 | 4.33 | 3.67 | 4.75 | 6.67 | 6.75 | 7.33 | 7.25 | 7.75 | 8.00 | 5.00 | 5.75 | 5.33 | 4.00 | 2.50 | 4.33 | 5.00 | 6.67 | 5.50 | 5.00 | 6.00 | 9.00 | 11.00 | 8.67 | 8.00 | 5.00 | 4.67 | 6.00 | 5.89 | 59.39 |
| i | 2.00 | 2.33 | 2.00 | 2.33 | 3.33 | 1.50 | 1.33 | 1.75 | 2.33 | 2.00 | 1.75 | 3.50 | 1.50 | 2.25 | 2.00 | 1.67 | 1.75 | 0.33 | 0.50 | 0.67 | 0.75 | 1.00 | 1.33 | 0.33 | 0.00 | 0.33 | 0.33 | 0.67 | 0.67 | 0.00 | 1.41 | 14.21 |
| c | 0.00 | 0.00 | 0.00 | 0.33 | 0.33 | 1.00 | 0.33 | 0.25 | 0.33 | 0.50 | 0.50 | 0.00 | 2.00 | 0.50 | 0.67 | 0.33 | 0.25 | 1.00 | 0.50 | 0.67 | 0.25 | 0.25 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.34 | 3.48 |
| CV | 172.67 | 174.67 | 185.33 | 214.33 | 200.33 | 211.50 | 209.67 | 221.75 | 236.00 | 216.00 | 231.00 | 229.00 | 261.50 | 226.75 | 204.33 | 165.33 | 137.25 | 151.33 | 161.25 | 145.67 | 105.25 | 134.00 | 170.00 | 189.33 | 178.00 | 129.67 | 168.00 | 120.67 | 104.33 | 80.33 | 177.84 | 100 |
| CVn | 117.33 | 124.67 | 136.33 | 170.00 | 150.33 | 153.75 | 143.00 | 147.75 | 160.67 | 134.00 | 139.25 | 111.50 | 136.00 | 113.00 | 102.33 | 57.00 | 37.50 | 56.33 | 45.25 | 47.67 | 54.25 | 86.00 | 112.33 | 103.67 | 78.00 | 89.67 | 148.67 | 115.00 | 96.67 | 69.67 | 107.92 | 60.68 |
| CVs | 55.33 | 50.00 | 49.00 | 44.33 | 50.00 | 57.75 | 66.67 | 74.00 | 75.33 | 82.00 | 91.75 | 117.50 | 125.50 | 113.75 | 102.00 | 108.33 | 99.75 | 95.00 | 116.00 | 98.00 | 51.00 | 48.00 | 57.67 | 85.67 | 100.00 | 40.00 | 19.33 | 5.67 | 7.67 | 10.67 | 69.92 | 39.32 |
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