Statistics of sunspot activity
April, 2001
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 | 290.50 | 219.00 | 231.75 | 197.00 | 202.67 | 135.00 | 141.75 | 187.67 | 147.75 | 140.75 | 161.75 | 154.00 | 136.33 | 135.67 | 100.25 | 96.67 | 65.67 | 53.75 | 77.75 | 101.33 | 156.00 | 156.33 | 139.00 | 158.00 | 166.67 | 172.50 | 165.25 | 139.50 | 157.75 | 168.67 | 151.89 | 100 |
| Wn | 138.75 | 111.50 | 110.50 | 97.25 | 89.67 | 63.50 | 49.00 | 64.67 | 47.00 | 28.00 | 23.00 | 22.75 | 18.33 | 40.67 | 25.25 | 19.67 | 14.67 | 38.75 | 67.25 | 71.33 | 102.67 | 104.00 | 93.50 | 108.50 | 113.33 | 124.75 | 116.75 | 108.00 | 124.25 | 135.33 | 75.75 | 49.87 |
| Ws | 151.75 | 107.50 | 121.25 | 99.75 | 113.00 | 71.50 | 92.75 | 123.00 | 100.75 | 112.75 | 138.75 | 131.25 | 118.00 | 95.00 | 75.00 | 77.00 | 51.00 | 15.00 | 10.50 | 30.00 | 53.33 | 52.33 | 45.50 | 49.50 | 53.33 | 47.75 | 48.50 | 31.50 | 33.50 | 33.33 | 76.14 | 50.13 |
| n | 12.50 | 11.00 | 14.25 | 14.25 | 13.00 | 9.00 | 8.00 | 10.33 | 8.75 | 7.50 | 9.00 | 9.00 | 8.33 | 9.33 | 8.00 | 7.67 | 5.33 | 4.25 | 4.75 | 6.00 | 8.00 | 7.33 | 7.00 | 7.75 | 8.00 | 8.50 | 9.00 | 7.50 | 8.00 | 8.67 | 8.67 | 100 |
| A | 1.00 | 0.00 | 2.75 | 3.50 | 2.67 | 1.00 | 0.50 | 0.33 | 0.50 | 0.50 | 0.25 | 0.50 | 0.00 | 0.67 | 1.25 | 1.00 | 2.33 | 1.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.50 | 1.00 | 0.25 | 1.25 | 0.50 | 1.00 | 1.33 | 0.89 | 10.32 |
| B | 1.00 | 0.50 | 0.50 | 0.25 | 0.33 | 0.25 | 0.25 | 2.00 | 0.50 | 0.25 | 0.75 | 0.25 | 0.00 | 1.33 | 0.25 | 0.00 | 1.00 | 0.00 | 0.00 | 0.33 | 0.33 | 0.00 | 0.00 | 0.00 | 0.33 | 0.25 | 0.50 | 0.00 | 0.00 | 0.67 | 0.39 | 4.55 |
| C | 2.25 | 1.50 | 4.50 | 2.25 | 2.00 | 1.25 | 1.00 | 0.33 | 1.00 | 1.00 | 1.75 | 0.50 | 1.00 | 2.33 | 1.00 | 2.67 | 0.33 | 1.00 | 0.75 | 0.67 | 1.00 | 0.67 | 1.25 | 1.50 | 2.00 | 1.50 | 1.00 | 1.25 | 1.50 | 1.33 | 1.40 | 16.19 |
| D | 2.00 | 1.50 | 2.25 | 3.50 | 4.67 | 2.50 | 1.50 | 1.00 | 1.25 | 1.50 | 3.75 | 5.50 | 5.33 | 2.33 | 0.75 | 1.00 | 0.33 | 0.75 | 2.00 | 3.00 | 2.67 | 2.33 | 2.25 | 1.00 | 1.67 | 2.00 | 1.75 | 1.50 | 1.75 | 0.00 | 2.11 | 24.36 |
| E | 0.75 | 1.00 | 1.00 | 0.25 | 0.33 | 0.25 | 0.25 | 0.33 | 0.75 | 0.75 | 0.75 | 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 | 0.33 | 0.23 | 2.69 |
| F | 1.50 | 1.00 | 0.75 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 0.67 | 1.00 | 0.75 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.75 | 1.00 | 0.44 | 5.06 |
| G | 1.25 | 1.00 | 0.75 | 0.50 | 1.33 | 0.75 | 1.25 | 1.67 | 1.00 | 1.00 | 1.00 | 1.00 | 1.33 | 1.00 | 1.25 | 0.33 | 0.00 | 0.00 | 0.25 | 1.00 | 0.33 | 0.33 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 1.67 | 0.70 | 8.08 |
| H | 0.50 | 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 | 0.00 | 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 | 0.04 | 0.42 |
| I | 2.25 | 4.50 | 1.75 | 4.00 | 1.67 | 3.00 | 3.25 | 4.67 | 3.75 | 2.50 | 0.50 | 1.00 | 0.67 | 1.67 | 3.50 | 2.33 | 1.33 | 1.25 | 1.00 | 1.00 | 3.00 | 3.00 | 2.50 | 2.75 | 2.00 | 3.50 | 3.50 | 3.25 | 2.25 | 2.33 | 2.46 | 28.33 |
| x | 2.00 | 0.50 | 3.25 | 3.75 | 3.00 | 1.25 | 0.75 | 2.33 | 1.00 | 0.75 | 1.00 | 0.75 | 0.00 | 2.00 | 1.50 | 1.00 | 3.33 | 1.25 | 0.00 | 0.33 | 0.33 | 0.00 | 0.00 | 1.50 | 1.33 | 0.50 | 1.75 | 0.50 | 1.00 | 2.00 | 1.29 | 14.87 |
| r | 0.50 | 0.50 | 1.00 | 0.50 | 0.67 | 0.00 | 0.25 | 0.00 | 0.25 | 0.50 | 0.50 | 0.00 | 0.00 | 0.33 | 1.25 | 1.33 | 0.67 | 1.00 | 0.25 | 0.00 | 0.67 | 0.00 | 0.00 | 0.00 | 0.67 | 1.50 | 0.75 | 0.25 | 0.50 | 1.00 | 0.49 | 5.71 |
| s | 3.00 | 4.00 | 4.00 | 5.25 | 3.67 | 3.00 | 3.00 | 4.33 | 4.00 | 2.75 | 4.00 | 3.25 | 2.67 | 4.00 | 3.50 | 4.00 | 0.67 | 1.25 | 1.25 | 2.67 | 3.00 | 2.00 | 2.50 | 3.50 | 3.33 | 4.00 | 2.00 | 2.25 | 3.25 | 2.00 | 3.07 | 35.42 |
| a | 4.50 | 4.00 | 3.75 | 3.50 | 4.33 | 3.75 | 3.00 | 2.67 | 2.50 | 2.25 | 2.50 | 4.00 | 4.67 | 2.00 | 0.50 | 0.67 | 0.67 | 0.75 | 2.25 | 2.00 | 3.00 | 3.67 | 3.50 | 2.00 | 1.67 | 1.75 | 3.50 | 3.50 | 2.25 | 3.33 | 2.75 | 31.70 |
| h | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.33 | 0.00 | 0.00 | 0.50 | 0.33 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.08 | 0.96 |
| k | 2.00 | 2.00 | 2.25 | 1.25 | 1.33 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.33 | 0.00 | 0.00 | 0.50 | 0.67 | 1.00 | 1.33 | 1.00 | 0.75 | 1.00 | 0.75 | 1.00 | 1.00 | 1.00 | 0.33 | 0.98 | 11.35 |
| x | 3.75 | 4.50 | 4.50 | 7.50 | 4.33 | 4.00 | 3.75 | 5.00 | 4.25 | 3.00 | 0.75 | 1.50 | 0.67 | 2.33 | 4.75 | 3.67 | 3.67 | 2.50 | 1.25 | 1.00 | 3.00 | 3.00 | 2.50 | 4.25 | 3.00 | 3.75 | 4.75 | 3.75 | 3.25 | 3.67 | 3.39 | 39.07 |
| o | 5.75 | 4.50 | 7.75 | 6.50 | 8.00 | 4.25 | 3.50 | 5.00 | 3.75 | 3.75 | 7.25 | 6.75 | 6.67 | 6.67 | 3.25 | 4.00 | 1.67 | 1.75 | 3.00 | 5.00 | 4.33 | 3.33 | 3.75 | 2.50 | 4.00 | 3.75 | 3.00 | 2.75 | 3.50 | 3.67 | 4.44 | 51.28 |
| i | 2.00 | 1.00 | 1.00 | 0.25 | 0.67 | 0.75 | 0.75 | 0.33 | 0.75 | 0.75 | 1.00 | 0.75 | 1.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 0.67 | 1.00 | 0.75 | 0.75 | 0.67 | 1.00 | 1.00 | 1.00 | 1.25 | 1.33 | 0.71 | 8.17 |
| c | 1.00 | 1.00 | 1.00 | 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 | 0.25 | 0.33 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.13 | 1.47 |
| CV | 242.00 | 212.50 | 224.50 | 180.25 | 201.00 | 138.25 | 126.25 | 136.67 | 133.50 | 132.75 | 174.25 | 184.25 | 182.67 | 137.00 | 112.50 | 91.67 | 21.67 | 33.75 | 100.75 | 129.00 | 134.33 | 150.33 | 127.25 | 108.75 | 124.33 | 125.50 | 122.00 | 116.50 | 132.75 | 106.00 | 138.10 | 100 |
| CVn | 131.00 | 105.00 | 116.50 | 94.50 | 104.67 | 57.75 | 41.25 | 40.00 | 34.25 | 29.50 | 31.25 | 24.00 | 26.33 | 34.00 | 39.00 | 30.00 | 8.33 | 31.50 | 92.75 | 100.00 | 92.00 | 88.33 | 76.75 | 66.75 | 83.00 | 77.50 | 95.50 | 97.75 | 109.75 | 90.00 | 68.30 | 49.46 |
| CVs | 111.00 | 107.50 | 108.00 | 85.75 | 96.33 | 80.50 | 85.00 | 96.67 | 99.25 | 103.25 | 143.00 | 160.25 | 156.33 | 103.00 | 73.50 | 61.67 | 13.33 | 2.25 | 8.00 | 29.00 | 42.33 | 62.00 | 50.50 | 42.00 | 41.33 | 48.00 | 26.50 | 18.75 | 23.00 | 16.00 | 69.80 | 50.54 |
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