Statistics of sunspot activity
April, 2000
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 | 280.50 | 304.33 | 240.50 | 176.75 | 200.00 | 146.25 | 149.00 | 148.50 | 163.00 | 151.67 | 131.67 | 156.25 | 167.50 | 161.00 | 151.67 | 140.25 | 157.50 | 134.33 | 147.50 | 157.75 | 178.50 | 209.25 | 241.67 | 216.50 | 198.25 | 190.25 | 155.75 | 184.50 | 133.33 | 116.00 | 176.33 | 100 |
| Wn | 112.75 | 116.00 | 108.00 | 73.75 | 78.00 | 50.75 | 44.67 | 44.00 | 37.33 | 38.00 | 46.00 | 59.25 | 72.00 | 85.33 | 71.33 | 70.50 | 73.00 | 66.00 | 89.00 | 84.75 | 104.25 | 124.00 | 127.00 | 116.75 | 109.25 | 101.00 | 75.00 | 68.75 | 46.67 | 38.75 | 77.73 | 44.08 |
| Ws | 167.75 | 188.33 | 132.50 | 103.00 | 122.00 | 95.50 | 104.33 | 104.50 | 125.67 | 113.67 | 85.67 | 97.00 | 95.50 | 75.67 | 80.33 | 69.75 | 84.50 | 68.33 | 58.50 | 73.00 | 74.25 | 85.25 | 114.67 | 99.75 | 89.00 | 89.25 | 80.75 | 115.75 | 86.67 | 77.25 | 98.60 | 55.92 |
| n | 15.25 | 14.67 | 14.00 | 11.50 | 12.33 | 10.00 | 9.67 | 8.50 | 9.33 | 8.33 | 8.00 | 8.50 | 11.25 | 11.00 | 9.33 | 8.50 | 11.50 | 9.33 | 9.75 | 10.50 | 11.50 | 12.00 | 13.33 | 11.75 | 8.75 | 8.25 | 7.50 | 8.75 | 7.33 | 6.25 | 10.22 | 100 |
| A | 1.25 | 1.00 | 2.50 | 0.00 | 1.00 | 1.00 | 0.67 | 1.50 | 2.33 | 1.33 | 1.33 | 0.00 | 1.00 | 1.00 | 1.00 | 0.00 | 1.50 | 1.00 | 0.25 | 1.00 | 0.00 | 0.25 | 2.00 | 2.75 | 0.75 | 0.75 | 1.00 | 1.50 | 0.67 | 0.00 | 1.01 | 9.89 |
| B | 1.50 | 0.67 | 1.00 | 0.25 | 0.33 | 0.75 | 1.33 | 0.25 | 0.00 | 0.00 | 1.00 | 1.75 | 2.75 | 1.33 | 0.67 | 1.25 | 1.50 | 0.67 | 2.25 | 0.50 | 1.00 | 1.25 | 2.00 | 0.75 | 0.25 | 0.75 | 0.75 | 1.75 | 0.67 | 0.50 | 0.98 | 9.59 |
| C | 1.50 | 2.33 | 2.50 | 2.00 | 2.33 | 2.50 | 3.00 | 2.75 | 3.33 | 2.00 | 2.33 | 2.75 | 2.50 | 3.00 | 2.33 | 2.50 | 2.50 | 2.67 | 1.75 | 1.50 | 1.25 | 3.50 | 0.67 | 0.25 | 0.50 | 1.00 | 1.00 | 1.75 | 1.33 | 2.25 | 2.05 | 20.08 |
| D | 5.75 | 8.00 | 6.50 | 5.75 | 4.00 | 2.75 | 0.67 | 0.75 | 0.67 | 1.00 | 1.33 | 1.75 | 2.50 | 1.67 | 1.67 | 1.50 | 0.50 | 1.33 | 1.00 | 2.25 | 2.25 | 2.00 | 3.33 | 3.00 | 2.50 | 2.00 | 0.75 | 1.00 | 1.00 | 1.00 | 2.34 | 22.88 |
| E | 0.50 | 0.33 | 0.00 | 0.50 | 0.00 | 0.00 | 0.33 | 1.00 | 0.67 | 0.67 | 0.33 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.75 | 0.67 | 1.00 | 1.25 | 1.50 | 0.75 | 0.75 | 1.00 | 0.50 | 0.43 | 4.24 |
| F | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.25 | 0.50 | 0.00 | 0.00 | 0.00 | 0.03 | 0.33 |
| G | 1.25 | 0.33 | 0.00 | 0.25 | 1.67 | 0.00 | 0.67 | 0.50 | 0.33 | 0.33 | 1.33 | 1.25 | 1.00 | 1.00 | 1.00 | 1.25 | 1.00 | 1.00 | 1.25 | 2.50 | 3.50 | 2.75 | 2.67 | 2.75 | 2.50 | 2.00 | 2.25 | 2.00 | 1.00 | 1.25 | 1.35 | 13.23 |
| H | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.03 | 0.33 |
| I | 3.50 | 2.00 | 1.50 | 2.75 | 3.00 | 2.75 | 3.00 | 1.75 | 2.00 | 3.00 | 0.33 | 0.75 | 1.50 | 3.00 | 2.67 | 2.00 | 4.50 | 2.67 | 3.25 | 2.25 | 3.00 | 1.50 | 2.00 | 1.25 | 0.75 | 0.00 | 0.50 | 0.00 | 1.67 | 0.75 | 1.99 | 19.43 |
| x | 2.75 | 1.67 | 3.50 | 0.25 | 1.33 | 1.75 | 2.00 | 1.75 | 2.33 | 1.33 | 2.33 | 1.75 | 3.75 | 2.33 | 1.67 | 1.25 | 3.00 | 1.67 | 2.50 | 1.50 | 1.00 | 1.50 | 4.00 | 3.50 | 1.00 | 1.50 | 1.75 | 3.25 | 1.33 | 0.50 | 1.99 | 19.48 |
| r | 2.00 | 0.00 | 0.00 | 1.00 | 0.67 | 0.50 | 0.33 | 0.00 | 0.00 | 0.33 | 0.33 | 0.50 | 0.75 | 0.67 | 0.67 | 1.00 | 1.00 | 1.67 | 1.25 | 1.00 | 1.25 | 1.75 | 0.33 | 0.25 | 0.25 | 0.00 | 0.25 | 0.50 | 0.33 | 0.75 | 0.64 | 6.30 |
| s | 4.50 | 7.33 | 7.00 | 6.00 | 5.33 | 4.75 | 5.67 | 4.00 | 5.00 | 4.33 | 3.33 | 3.25 | 3.50 | 5.00 | 5.00 | 4.00 | 3.00 | 4.00 | 3.00 | 3.50 | 3.50 | 3.50 | 2.00 | 2.75 | 2.00 | 1.00 | 1.75 | 2.50 | 2.33 | 1.50 | 3.81 | 37.28 |
| a | 5.00 | 5.00 | 3.00 | 3.00 | 4.33 | 2.50 | 1.67 | 2.75 | 2.00 | 2.33 | 1.67 | 3.00 | 2.50 | 2.67 | 1.67 | 2.00 | 4.50 | 2.00 | 3.00 | 4.00 | 4.00 | 3.25 | 5.00 | 3.25 | 3.25 | 3.75 | 1.75 | 0.50 | 1.33 | 1.50 | 2.87 | 28.10 |
| h | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.05 | 0.52 |
| k | 1.00 | 0.67 | 0.50 | 1.25 | 0.67 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.50 | 0.33 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.25 | 1.75 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 1.75 | 0.85 | 8.32 |
| x | 4.75 | 3.00 | 4.00 | 2.75 | 4.00 | 4.00 | 3.67 | 3.25 | 4.33 | 4.33 | 1.67 | 0.75 | 2.50 | 4.00 | 3.67 | 2.00 | 6.00 | 3.67 | 3.50 | 3.75 | 3.25 | 1.75 | 4.00 | 4.00 | 1.50 | 0.75 | 1.50 | 1.50 | 2.33 | 0.75 | 3.03 | 29.65 |
| o | 8.75 | 10.33 | 9.00 | 7.25 | 6.67 | 5.50 | 5.00 | 4.25 | 4.00 | 3.33 | 5.67 | 7.00 | 8.50 | 6.00 | 5.67 | 6.50 | 5.50 | 5.67 | 5.75 | 6.50 | 8.00 | 9.25 | 8.67 | 6.75 | 5.75 | 5.75 | 4.75 | 6.25 | 4.00 | 4.75 | 6.36 | 62.20 |
| i | 1.25 | 1.00 | 0.00 | 1.25 | 1.33 | 0.50 | 1.00 | 0.50 | 1.00 | 0.67 | 0.33 | 0.75 | 0.25 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.25 | 0.25 | 0.50 | 0.00 | 0.50 | 0.75 | 1.00 | 0.50 | 0.25 | 0.33 | 0.75 | 0.55 | 5.35 |
| c | 0.50 | 0.33 | 1.00 | 0.25 | 0.33 | 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 | 0.50 | 0.67 | 0.50 | 0.75 | 0.75 | 0.75 | 0.75 | 0.67 | 0.00 | 0.29 | 2.80 |
| CV | 231.00 | 256.33 | 214.00 | 218.50 | 194.33 | 128.75 | 102.33 | 103.75 | 95.67 | 93.33 | 109.00 | 108.50 | 134.50 | 125.67 | 119.33 | 109.50 | 92.00 | 95.67 | 93.00 | 155.00 | 206.75 | 210.00 | 217.00 | 215.75 | 214.75 | 188.25 | 166.75 | 162.25 | 146.67 | 133.25 | 154.72 | 100 |
| CVn | 97.50 | 107.33 | 85.50 | 91.00 | 70.00 | 45.50 | 35.67 | 44.00 | 30.33 | 25.00 | 18.00 | 25.50 | 29.25 | 43.00 | 49.00 | 53.25 | 45.50 | 55.33 | 58.75 | 83.75 | 113.00 | 114.50 | 125.00 | 120.75 | 122.50 | 102.25 | 102.00 | 79.75 | 64.67 | 57.75 | 69.84 | 45.14 |
| CVs | 133.50 | 149.00 | 128.50 | 127.50 | 124.33 | 83.25 | 66.67 | 59.75 | 65.33 | 68.33 | 91.00 | 83.00 | 105.25 | 82.67 | 70.33 | 56.25 | 46.50 | 40.33 | 34.25 | 71.25 | 93.75 | 95.50 | 92.00 | 95.00 | 92.25 | 86.00 | 64.75 | 82.50 | 82.00 | 75.50 | 84.88 | 54.86 |
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