Statistics of sunspot activity
May, 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 | 31 | Average | % |
| W | 151.00 | 167.50 | 156.50 | 170.75 | 175.00 | | 105.00 | 79.25 | 91.33 | 82.00 | 99.50 | 101.00 | 114.33 | 129.00 | 130.50 | 115.50 | 122.33 | 104.67 | 93.67 | 87.25 | 104.00 | 154.67 | 164.25 | 156.50 | 125.50 | 155.75 | 176.50 | 144.00 | 117.25 | 80.00 | 83.00 | 124.58 | 100 |
| Wn | 117.00 | 133.00 | 122.75 | 137.00 | 127.25 | | 56.00 | 38.50 | 30.67 | 28.25 | 39.25 | 47.20 | 63.33 | 54.75 | 56.25 | 56.00 | 73.67 | 77.00 | 66.67 | 56.50 | 67.00 | 96.67 | 107.00 | 100.75 | 88.25 | 113.75 | 130.00 | 106.25 | 92.50 | 60.67 | 58.33 | 80.07 | 64.27 |
| Ws | 34.00 | 34.50 | 33.75 | 33.75 | 47.75 | | 49.00 | 40.75 | 60.67 | 53.75 | 60.25 | 53.80 | 51.00 | 74.25 | 74.25 | 59.50 | 48.67 | 27.67 | 27.00 | 30.75 | 37.00 | 58.00 | 57.25 | 55.75 | 37.25 | 42.00 | 46.50 | 37.75 | 24.75 | 19.33 | 24.67 | 44.51 | 35.73 |
| n | 8.00 | 8.25 | 8.50 | 8.50 | 9.75 | | 7.25 | 5.50 | 6.33 | 6.25 | 6.50 | 5.40 | 5.33 | 6.25 | 7.00 | 6.00 | 6.00 | 6.00 | 6.33 | 5.50 | 7.00 | 10.00 | 10.25 | 9.25 | 7.00 | 10.50 | 12.25 | 10.00 | 9.00 | 5.33 | 6.33 | 7.52 | 100 |
| A | 0.25 | 0.75 | 1.25 | 1.00 | 0.00 | | 0.75 | 1.25 | 1.33 | 0.25 | 1.00 | 1.00 | 0.33 | 1.00 | 1.00 | 0.00 | 0.00 | 0.33 | 0.67 | 0.50 | 0.50 | 1.67 | 1.75 | 0.75 | 0.25 | 0.75 | 0.75 | 1.50 | 2.25 | 0.67 | 1.00 | 0.82 | 10.86 |
| B | 0.75 | 0.00 | 0.00 | 0.00 | 0.25 | | 0.25 | 0.00 | 0.33 | 0.25 | 0.00 | 0.40 | 0.00 | 0.25 | 1.25 | 0.25 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.67 | 0.75 | 1.00 | 1.25 | 2.00 | 3.00 | 0.50 | 0.50 | 0.33 | 0.00 | 0.48 | 6.35 |
| C | 1.25 | 0.50 | 0.25 | 1.50 | 0.75 | | 2.25 | 1.25 | 2.67 | 2.00 | 1.75 | 0.80 | 0.00 | 1.75 | 0.75 | 0.00 | 0.00 | 0.33 | 1.33 | 0.00 | 1.50 | 3.00 | 1.75 | 1.00 | 1.25 | 1.50 | 1.75 | 2.00 | 1.25 | 0.67 | 1.33 | 1.20 | 16.02 |
| D | 1.00 | 1.25 | 0.75 | 1.00 | 1.50 | | 0.50 | 0.25 | 0.33 | 0.75 | 1.50 | 1.40 | 1.67 | 1.00 | 1.00 | 2.75 | 2.33 | 2.00 | 2.00 | 2.50 | 1.50 | 1.00 | 1.75 | 2.00 | 1.00 | 1.25 | 2.50 | 2.50 | 2.00 | 0.67 | 1.00 | 1.42 | 18.91 |
| E | 1.00 | 0.75 | 0.00 | 0.50 | 0.50 | | 0.25 | 0.00 | 0.00 | 0.00 | 0.25 | 0.40 | 1.33 | 0.50 | 0.50 | 0.25 | 0.67 | 0.33 | 0.33 | 0.25 | 1.00 | 1.00 | 0.75 | 0.25 | 0.50 | 0.25 | 0.50 | 0.25 | 0.00 | 0.67 | 0.33 | 0.44 | 5.90 |
| F | 0.25 | 1.00 | 1.00 | 1.00 | 1.25 | | 0.75 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.75 | 0.75 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.75 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.32 | 4.29 |
| G | 1.00 | 0.25 | 1.50 | 0.75 | 0.50 | | 0.75 | 0.50 | 0.67 | 0.25 | 0.75 | 0.60 | 0.67 | 1.00 | 0.75 | 1.00 | 0.67 | 1.67 | 0.33 | 1.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.75 | 0.25 | 1.00 | 0.00 | 0.33 | 0.67 | 0.60 | 8.02 |
| H | 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 | 0.00 | 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 | 0.75 | 0.00 | 0.00 | 0.03 | 0.44 |
| I | 2.50 | 3.75 | 3.75 | 2.75 | 5.00 | | 1.75 | 1.75 | 1.00 | 2.50 | 1.25 | 0.80 | 1.33 | 0.25 | 1.00 | 1.00 | 1.67 | 1.00 | 1.67 | 1.00 | 2.50 | 2.67 | 3.25 | 3.50 | 2.50 | 4.00 | 3.25 | 2.25 | 2.25 | 2.00 | 2.00 | 2.20 | 29.21 |
| x | 1.00 | 0.75 | 1.25 | 1.00 | 0.25 | | 1.00 | 1.25 | 1.67 | 0.50 | 1.00 | 1.40 | 0.33 | 1.25 | 2.25 | 0.25 | 0.00 | 0.67 | 0.67 | 0.50 | 0.50 | 2.33 | 2.50 | 1.75 | 1.50 | 2.75 | 3.75 | 2.00 | 2.75 | 1.00 | 1.00 | 1.29 | 17.21 |
| r | 1.00 | 0.50 | 0.75 | 0.25 | 0.25 | | 0.00 | 0.25 | 0.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.67 | 0.00 | 0.00 | 0.00 | 0.75 | 0.50 | 0.25 | 0.75 | 0.50 | 0.50 | 0.25 | 0.00 | 0.00 | 0.28 | 3.73 |
| s | 3.50 | 4.00 | 1.75 | 3.25 | 3.50 | | 3.50 | 1.75 | 2.67 | 2.25 | 3.00 | 1.40 | 2.33 | 2.00 | 2.00 | 2.25 | 1.00 | 3.00 | 2.67 | 1.50 | 4.50 | 5.33 | 4.25 | 3.25 | 3.25 | 3.00 | 3.25 | 3.50 | 2.25 | 2.67 | 3.00 | 2.85 | 37.93 |
| a | 2.25 | 2.50 | 4.75 | 4.00 | 5.75 | | 2.75 | 2.25 | 2.00 | 2.00 | 1.50 | 2.40 | 2.67 | 2.50 | 2.50 | 3.50 | 5.00 | 2.33 | 2.33 | 3.25 | 1.00 | 1.33 | 1.75 | 2.75 | 1.25 | 3.00 | 3.75 | 3.00 | 2.75 | 1.67 | 2.33 | 2.69 | 35.83 |
| h | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.25 | 0.00 | 0.00 | 0.06 | 0.81 |
| k | 0.25 | 0.50 | 0.00 | 0.00 | 0.00 | | 0.00 | 0.00 | 0.00 | 0.25 | 1.00 | 0.20 | 0.00 | 0.25 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 1.00 | 0.67 | 0.50 | 1.00 | 0.75 | 1.00 | 1.00 | 0.50 | 0.75 | 0.00 | 0.00 | 0.34 | 4.49 |
| x | 2.75 | 4.50 | 5.00 | 3.75 | 5.00 | | 2.50 | 3.00 | 2.33 | 3.00 | 2.25 | 1.80 | 1.67 | 1.25 | 2.00 | 1.00 | 1.67 | 1.33 | 2.33 | 1.50 | 3.00 | 4.33 | 5.00 | 4.25 | 2.75 | 4.75 | 4.00 | 3.75 | 5.25 | 2.67 | 3.00 | 3.05 | 40.51 |
| o | 3.75 | 1.75 | 2.50 | 3.25 | 2.75 | | 3.75 | 2.00 | 4.00 | 3.00 | 3.75 | 3.20 | 2.33 | 4.00 | 3.75 | 4.00 | 3.00 | 4.00 | 3.67 | 3.75 | 3.00 | 4.67 | 3.75 | 3.25 | 3.25 | 5.25 | 7.50 | 6.00 | 3.50 | 2.00 | 3.00 | 3.58 | 47.60 |
| i | 1.50 | 1.75 | 1.00 | 1.50 | 2.00 | | 1.00 | 0.50 | 0.00 | 0.25 | 0.50 | 0.40 | 1.33 | 1.00 | 1.25 | 1.00 | 1.33 | 0.67 | 0.33 | 0.25 | 1.00 | 1.00 | 1.50 | 1.75 | 1.00 | 0.50 | 0.75 | 0.25 | 0.25 | 0.67 | 0.33 | 0.89 | 11.78 |
| c | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.11 |
| CV | 113.25 | 128.00 | 100.75 | 112.25 | 132.00 | | 93.25 | 56.00 | 58.33 | 75.75 | 111.25 | 71.20 | 95.33 | 93.25 | 94.25 | 115.75 | 105.00 | 106.00 | 83.33 | 100.00 | 123.50 | 130.67 | 137.00 | 133.00 | 95.00 | 120.75 | 146.50 | 147.25 | 111.25 | 65.33 | 76.67 | 104.40 | 100 |
| CVn | 95.00 | 106.75 | 84.25 | 90.00 | 95.75 | | 55.75 | 32.75 | 28.00 | 34.00 | 56.25 | 45.20 | 50.00 | 44.25 | 48.50 | 64.75 | 66.67 | 82.33 | 70.00 | 56.75 | 84.50 | 98.67 | 114.00 | 104.00 | 78.50 | 102.75 | 115.50 | 120.50 | 101.50 | 51.33 | 59.33 | 74.58 | 71.44 |
| CVs | 18.25 | 21.25 | 16.50 | 22.25 | 36.25 | | 37.50 | 23.25 | 30.33 | 41.75 | 55.00 | 26.00 | 45.33 | 49.00 | 45.75 | 51.00 | 38.33 | 23.67 | 13.33 | 43.25 | 39.00 | 32.00 | 23.00 | 29.00 | 16.50 | 18.00 | 31.00 | 26.75 | 9.75 | 14.00 | 17.33 | 29.81 | 28.56 |
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