Statistics of sunspot activity
May, 1999
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 | 46.50 | 81.00 | 81.00 | 90.00 | 124.75 | 127.50 | 162.00 | 187.50 | 178.25 | 126.20 | 113.00 | 93.20 | 82.25 | 88.50 | 106.00 | 85.80 | 90.00 | 101.67 | 111.50 | | 124.00 | 94.40 | 102.67 | 101.00 | 95.00 | 131.75 | 150.25 | 119.00 | 136.33 | 149.67 | 155.00 | 114.52 | 100 |
| Wn | 32.50 | 59.00 | 50.00 | 72.75 | 86.75 | 94.75 | 123.00 | 130.00 | 119.00 | 74.80 | 53.33 | 34.20 | 41.25 | 42.25 | 50.75 | 46.00 | 41.00 | 38.67 | 36.50 | | 44.50 | 26.20 | 28.00 | 44.00 | 51.00 | 82.75 | 92.00 | 78.67 | 93.33 | 106.00 | 86.00 | 65.30 | 57.02 |
| Ws | 14.00 | 22.00 | 31.00 | 17.25 | 38.00 | 32.75 | 39.00 | 57.50 | 59.25 | 51.40 | 59.67 | 59.00 | 41.00 | 46.25 | 55.25 | 39.80 | 49.00 | 63.00 | 75.00 | | 79.50 | 68.20 | 74.67 | 57.00 | 44.00 | 49.00 | 58.25 | 40.33 | 43.00 | 43.67 | 69.00 | 49.22 | 42.98 |
| n | 3.25 | 5.33 | 5.33 | 5.50 | 8.50 | 9.00 | 11.00 | 11.75 | 11.00 | 7.20 | 6.33 | 5.00 | 4.50 | 5.75 | 6.75 | 5.80 | 6.00 | 6.33 | 6.50 | | 6.75 | 5.20 | 6.00 | 6.00 | 6.00 | 7.75 | 9.25 | 8.00 | 8.67 | 8.33 | 9.00 | 7.06 | 100 |
| A | 1.50 | 0.33 | 1.33 | 0.50 | 1.25 | 1.25 | 0.00 | 0.00 | 0.75 | 0.40 | 0.33 | 0.60 | 0.75 | 0.00 | 1.00 | 0.40 | 1.00 | 0.33 | 1.00 | | 0.00 | 0.00 | 0.67 | 0.00 | 0.25 | 0.25 | 0.75 | 0.67 | 1.00 | 2.33 | 0.00 | 0.62 | 8.81 |
| B | 0.00 | 2.67 | 1.67 | 1.25 | 2.50 | 1.50 | 1.67 | 0.75 | 2.50 | 2.00 | 1.33 | 0.40 | 0.75 | 1.75 | 0.75 | 0.20 | 0.60 | 1.33 | 0.50 | | 0.25 | 0.00 | 0.00 | 0.00 | 0.75 | 0.50 | 1.50 | 1.33 | 1.00 | 0.67 | 2.00 | 1.07 | 15.16 |
| C | 0.00 | 0.67 | 0.67 | 1.75 | 1.75 | 3.50 | 5.67 | 3.25 | 1.75 | 1.40 | 1.67 | 1.80 | 0.75 | 1.25 | 1.25 | 1.80 | 0.60 | 0.67 | 2.00 | | 1.75 | 0.60 | 2.00 | 2.50 | 3.25 | 3.00 | 2.00 | 0.00 | 0.67 | 0.33 | 2.00 | 1.68 | 23.74 |
| D | 0.00 | 0.00 | 0.00 | 0.50 | 0.75 | 1.00 | 2.33 | 5.00 | 3.50 | 1.80 | 1.00 | 1.20 | 1.00 | 1.25 | 2.25 | 0.80 | 0.60 | 0.67 | 1.00 | | 2.25 | 1.60 | 0.33 | 0.25 | 0.00 | 1.25 | 1.75 | 2.00 | 3.00 | 3.67 | 3.00 | 1.46 | 20.66 |
| E | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.40 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | | 0.25 | 0.40 | 0.00 | 0.25 | 0.25 | 0.00 | 0.00 | 1.00 | 0.33 | 0.00 | 0.00 | 0.12 | 1.64 |
| F | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | | 0.25 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.33 | 0.00 | 0.07 | 0.94 |
| G | 1.00 | 1.00 | 0.67 | 1.00 | 1.00 | 0.50 | 0.33 | 2.00 | 0.75 | 0.20 | 0.00 | 0.40 | 1.00 | 0.25 | 0.25 | 0.40 | 1.20 | 1.00 | 1.00 | | 1.25 | 0.80 | 2.00 | 1.50 | 0.75 | 1.25 | 1.50 | 0.00 | 0.33 | 0.33 | 0.00 | 0.79 | 11.17 |
| H | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.75 | 1.20 | 1.20 | 1.00 | 0.00 | | 0.00 | 0.40 | 0.67 | 0.75 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.24 | 3.41 |
| I | 0.75 | 0.67 | 0.67 | 0.50 | 1.25 | 1.00 | 1.00 | 0.75 | 1.25 | 0.80 | 1.33 | 0.60 | 0.25 | 1.00 | 0.50 | 1.00 | 0.80 | 1.33 | 1.00 | | 0.75 | 1.20 | 0.33 | 0.75 | 0.75 | 1.50 | 1.75 | 3.00 | 2.00 | 0.67 | 1.50 | 1.02 | 14.47 |
| x | 1.50 | 3.00 | 3.00 | 1.75 | 3.75 | 2.75 | 1.67 | 0.75 | 3.25 | 2.40 | 1.67 | 1.00 | 1.50 | 1.75 | 1.75 | 0.60 | 1.60 | 1.67 | 1.50 | | 0.25 | 0.00 | 0.67 | 0.00 | 1.00 | 0.75 | 2.25 | 2.00 | 2.00 | 3.00 | 2.00 | 1.69 | 23.97 |
| r | 0.25 | 0.33 | 0.33 | 0.75 | 1.00 | 0.75 | 1.67 | 1.50 | 0.00 | 0.00 | 1.00 | 0.60 | 0.25 | 0.25 | 0.00 | 0.20 | 0.00 | 0.33 | 1.00 | | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.25 | 0.67 | 1.33 | 0.00 | 0.00 | 0.45 | 6.36 |
| s | 1.25 | 1.67 | 1.67 | 2.25 | 2.25 | 2.25 | 4.00 | 4.50 | 4.50 | 2.40 | 1.67 | 1.00 | 1.25 | 1.25 | 1.25 | 2.00 | 0.80 | 1.67 | 1.50 | | 1.50 | 2.40 | 2.00 | 1.75 | 2.50 | 3.75 | 2.00 | 2.67 | 2.00 | 2.00 | 5.00 | 2.22 | 31.49 |
| a | 0.25 | 0.33 | 0.33 | 0.75 | 1.50 | 3.00 | 3.00 | 4.00 | 2.25 | 1.60 | 1.33 | 1.60 | 0.75 | 1.50 | 1.75 | 1.40 | 2.00 | 1.33 | 1.50 | | 4.25 | 2.20 | 2.67 | 2.50 | 1.25 | 1.00 | 3.50 | 1.67 | 2.33 | 2.00 | 1.00 | 1.82 | 25.76 |
| h | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.67 | 0.75 | 0.25 | 0.20 | 0.00 | 0.00 | 0.00 | 0.25 | 0.25 | 0.00 | 0.00 | 0.00 | 0.50 | | 0.00 | 0.20 | 0.00 | 1.25 | 0.50 | 0.50 | 0.50 | 0.00 | 0.67 | 0.33 | 0.00 | 0.24 | 3.34 |
| k | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.75 | 0.60 | 0.67 | 0.80 | 0.75 | 0.75 | 1.75 | 1.60 | 1.60 | 1.33 | 0.50 | | 0.75 | 0.40 | 0.67 | 0.50 | 0.75 | 0.75 | 0.75 | 1.00 | 0.33 | 1.00 | 1.00 | 0.64 | 9.09 |
| x | 2.25 | 1.00 | 2.00 | 1.00 | 2.50 | 2.50 | 1.00 | 0.75 | 2.25 | 1.20 | 1.67 | 1.20 | 1.00 | 1.25 | 2.25 | 2.60 | 3.00 | 2.67 | 2.00 | | 0.75 | 1.60 | 1.67 | 1.50 | 1.00 | 1.75 | 2.50 | 3.67 | 3.00 | 3.00 | 2.00 | 1.88 | 26.69 |
| o | 1.00 | 4.33 | 3.00 | 4.50 | 6.00 | 6.50 | 10.00 | 11.00 | 7.50 | 5.00 | 4.00 | 3.40 | 3.50 | 4.50 | 4.25 | 3.20 | 3.00 | 3.67 | 4.50 | | 5.25 | 2.80 | 4.33 | 4.25 | 4.75 | 5.75 | 6.50 | 3.33 | 4.00 | 4.00 | 6.50 | 4.81 | 68.14 |
| i | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.25 | 0.60 | 0.33 | 0.40 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | | 0.50 | 0.80 | 0.00 | 0.25 | 0.25 | 0.25 | 0.25 | 0.67 | 1.33 | 1.33 | 0.50 | 0.31 | 4.39 |
| c | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.33 | 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 | 0.33 | 0.33 | 0.00 | 0.00 | 0.06 | 0.78 |
| CV | 32.75 | 42.67 | 42.67 | 59.25 | 70.25 | 83.75 | 133.67 | 209.00 | 168.50 | 110.60 | 82.33 | 77.80 | 76.00 | 85.50 | 135.00 | 107.80 | 104.40 | 102.67 | 95.50 | | 127.75 | 106.40 | 98.67 | 133.25 | 101.75 | 130.50 | 136.75 | 117.33 | 136.67 | 141.33 | 139.00 | 106.32 | 100 |
| CVn | 31.50 | 39.33 | 36.33 | 51.00 | 56.50 | 70.50 | 97.33 | 157.25 | 108.25 | 61.60 | 53.00 | 41.20 | 49.75 | 57.75 | 89.50 | 75.60 | 65.00 | 66.67 | 54.50 | | 60.25 | 43.80 | 38.33 | 75.25 | 68.25 | 90.50 | 92.25 | 86.00 | 107.67 | 98.33 | 90.00 | 70.44 | 66.25 |
| CVs | 1.25 | 3.33 | 6.33 | 8.25 | 13.75 | 13.25 | 36.33 | 51.75 | 60.25 | 49.00 | 29.33 | 36.60 | 26.25 | 27.75 | 45.50 | 32.20 | 39.40 | 36.00 | 41.00 | | 67.50 | 62.60 | 60.33 | 58.00 | 33.50 | 40.00 | 44.50 | 31.33 | 29.00 | 43.00 | 49.00 | 35.88 | 33.75 |
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