Statistics of sunspot activity
May, 1990
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 | 85.67 | 75.17 | 72.40 | 94.40 | 95.86 | 123.29 | 163.40 | 173.50 | 187.50 | 149.50 | 153.33 | 215.00 | 201.60 | 180.83 | 195.43 | 215.14 | 238.17 | 201.00 | 206.86 | 253.17 | 270.25 | 220.33 | 201.83 | 204.20 | 186.86 | 170.29 | 181.40 | 136.60 | 151.20 | 112.14 | 135.71 | 169.42 | 100 |
| Wn | 28.83 | 30.33 | 42.60 | 49.80 | 38.14 | 57.86 | 82.20 | 78.33 | 90.33 | 73.00 | 91.33 | 130.00 | 131.40 | 123.83 | 115.57 | 105.57 | 101.50 | 84.33 | 97.43 | 109.17 | 132.00 | 88.67 | 88.83 | 104.60 | 102.00 | 100.00 | 100.80 | 74.80 | 76.20 | 59.57 | 80.71 | 86.12 | 50.83 |
| Ws | 56.83 | 44.83 | 29.80 | 44.60 | 57.71 | 65.43 | 81.20 | 95.17 | 97.17 | 76.50 | 62.00 | 85.00 | 70.20 | 57.00 | 79.86 | 109.57 | 136.67 | 116.67 | 109.43 | 144.00 | 138.25 | 131.67 | 113.00 | 99.60 | 84.86 | 70.29 | 80.60 | 61.80 | 75.00 | 52.57 | 55.00 | 83.30 | 49.17 |
| n | 6.67 | 6.17 | 5.80 | 6.80 | 6.29 | 7.00 | 8.40 | 9.00 | 9.00 | 7.50 | 8.50 | 11.00 | 10.80 | 8.17 | 7.29 | 7.57 | 9.83 | 8.50 | 10.14 | 9.17 | 10.50 | 7.83 | 7.17 | 8.80 | 10.57 | 9.29 | 10.00 | 8.40 | 9.40 | 7.00 | 8.00 | 8.40 | 100 |
| A | 1.00 | 1.50 | 0.80 | 0.60 | 0.14 | 0.00 | 1.20 | 1.17 | 1.00 | 1.17 | 0.50 | 0.00 | 2.60 | 1.83 | 1.29 | 1.00 | 2.83 | 1.33 | 1.57 | 0.83 | 0.75 | 0.17 | 0.00 | 0.60 | 2.29 | 1.57 | 2.60 | 1.00 | 0.80 | 0.71 | 2.71 | 1.15 | 13.65 |
| B | 1.17 | 0.33 | 0.00 | 1.00 | 1.29 | 0.57 | 0.20 | 0.50 | 1.00 | 1.00 | 2.50 | 2.00 | 1.60 | 1.83 | 1.71 | 3.14 | 3.00 | 1.17 | 2.14 | 1.17 | 1.75 | 1.00 | 0.17 | 0.80 | 1.29 | 1.43 | 1.40 | 1.80 | 2.80 | 1.43 | 0.29 | 1.34 | 15.92 |
| C | 2.17 | 1.33 | 1.20 | 0.20 | 1.00 | 1.71 | 1.80 | 2.50 | 2.17 | 0.83 | 2.00 | 3.00 | 1.80 | 1.67 | 1.14 | 0.14 | 1.00 | 2.17 | 1.14 | 2.33 | 2.50 | 0.83 | 1.50 | 1.40 | 2.00 | 1.71 | 2.00 | 2.60 | 1.80 | 1.14 | 1.14 | 1.61 | 19.17 |
| D | 0.17 | 0.00 | 0.00 | 0.20 | 0.57 | 1.71 | 2.00 | 2.17 | 1.67 | 1.50 | 0.50 | 1.00 | 1.20 | 0.50 | 1.00 | 0.57 | 0.17 | 1.50 | 2.86 | 2.33 | 3.00 | 3.00 | 3.33 | 3.80 | 2.71 | 2.14 | 1.80 | 1.20 | 2.00 | 1.43 | 2.00 | 1.55 | 18.44 |
| E | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.29 | 0.40 | 0.50 | 0.50 | 0.83 | 0.33 | 2.00 | 1.20 | 1.17 | 1.14 | 1.29 | 1.17 | 0.67 | 1.00 | 0.50 | 0.25 | 1.00 | 0.33 | 0.80 | 0.14 | 0.29 | 1.00 | 1.00 | 0.60 | 0.57 | 0.14 | 0.62 | 7.41 |
| F | 0.00 | 0.00 | 0.00 | 0.20 | 0.29 | 0.29 | 0.20 | 0.33 | 0.50 | 0.33 | 0.17 | 0.00 | 0.00 | 0.17 | 0.43 | 0.43 | 0.50 | 1.00 | 0.71 | 1.00 | 1.00 | 0.50 | 0.67 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.14 | 0.00 | 0.30 | 3.55 |
| G | 0.00 | 0.00 | 0.40 | 0.80 | 0.86 | 0.43 | 0.60 | 0.17 | 0.33 | 0.00 | 0.83 | 1.00 | 1.20 | 0.83 | 0.43 | 1.00 | 1.17 | 0.50 | 0.14 | 0.17 | 0.00 | 0.17 | 0.83 | 0.40 | 0.71 | 0.57 | 0.40 | 0.00 | 0.40 | 0.29 | 0.86 | 0.50 | 5.94 |
| H | 0.00 | 0.00 | 0.20 | 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 | 0.17 | 0.17 | 0.00 | 0.14 | 0.14 | 0.00 | 0.40 | 0.60 | 0.43 | 0.00 | 0.07 | 0.86 |
| I | 2.17 | 3.00 | 3.00 | 3.80 | 2.14 | 2.00 | 2.00 | 1.67 | 1.83 | 1.83 | 1.67 | 2.00 | 1.20 | 0.17 | 0.14 | 0.00 | 0.00 | 0.17 | 0.57 | 0.83 | 1.25 | 1.00 | 0.17 | 0.80 | 1.29 | 1.43 | 0.80 | 0.40 | 0.20 | 0.86 | 0.86 | 1.27 | 15.06 |
| x | 2.17 | 1.83 | 0.80 | 1.60 | 1.43 | 0.57 | 1.40 | 1.67 | 2.00 | 2.17 | 3.00 | 2.00 | 4.20 | 3.67 | 3.00 | 4.14 | 5.83 | 2.50 | 3.71 | 2.00 | 2.50 | 1.17 | 0.17 | 1.40 | 3.57 | 3.00 | 4.00 | 2.80 | 3.60 | 2.14 | 3.00 | 2.49 | 29.57 |
| r | 0.83 | 0.00 | 0.00 | 0.00 | 0.57 | 0.43 | 0.60 | 0.17 | 0.50 | 0.17 | 1.17 | 1.00 | 0.80 | 0.67 | 0.43 | 0.00 | 0.00 | 0.17 | 0.14 | 1.67 | 0.75 | 0.50 | 0.00 | 0.20 | 0.29 | 1.71 | 0.80 | 0.20 | 0.20 | 0.29 | 0.00 | 0.46 | 5.47 |
| s | 2.50 | 2.50 | 3.40 | 2.80 | 1.86 | 2.57 | 2.80 | 3.17 | 3.00 | 1.67 | 2.00 | 2.00 | 2.20 | 1.00 | 0.29 | 1.00 | 0.83 | 1.17 | 1.71 | 1.67 | 1.50 | 1.00 | 0.50 | 0.40 | 1.00 | 1.00 | 1.60 | 2.00 | 1.80 | 1.29 | 1.86 | 1.74 | 20.75 |
| a | 1.17 | 1.83 | 1.40 | 2.40 | 2.14 | 3.14 | 3.60 | 4.00 | 3.50 | 3.33 | 2.33 | 5.00 | 2.20 | 1.67 | 1.86 | 0.57 | 1.00 | 2.67 | 2.57 | 1.83 | 3.25 | 2.50 | 3.50 | 3.40 | 4.00 | 2.29 | 2.00 | 2.40 | 3.00 | 2.86 | 3.14 | 2.60 | 30.92 |
| h | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.20 | 0.00 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.40 | 0.00 | 0.14 | 0.60 | 0.00 | 0.20 | 0.00 | 0.00 | 0.10 | 1.17 |
| k | 0.00 | 0.00 | 0.00 | 0.00 | 0.29 | 0.29 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 1.20 | 1.17 | 1.57 | 1.86 | 2.17 | 2.00 | 2.00 | 2.00 | 2.50 | 2.67 | 2.83 | 3.00 | 1.71 | 1.14 | 1.00 | 1.00 | 0.60 | 0.43 | 0.00 | 1.02 | 12.12 |
| x | 3.17 | 4.50 | 4.00 | 4.40 | 2.29 | 2.00 | 3.20 | 2.83 | 2.83 | 3.00 | 2.17 | 2.00 | 3.80 | 2.00 | 1.43 | 1.00 | 2.83 | 1.50 | 2.14 | 1.67 | 2.00 | 1.33 | 0.33 | 1.40 | 3.71 | 3.14 | 3.40 | 1.80 | 1.60 | 2.00 | 3.57 | 2.49 | 29.57 |
| o | 3.50 | 1.67 | 1.60 | 2.20 | 3.57 | 4.14 | 4.20 | 5.17 | 4.83 | 2.83 | 5.67 | 7.00 | 5.00 | 4.50 | 4.14 | 4.71 | 5.17 | 5.17 | 5.86 | 5.33 | 5.00 | 3.50 | 4.33 | 5.00 | 6.29 | 5.14 | 5.60 | 4.80 | 7.00 | 4.14 | 4.00 | 4.55 | 54.14 |
| i | 0.00 | 0.00 | 0.20 | 0.20 | 0.43 | 0.86 | 1.00 | 1.00 | 1.33 | 1.67 | 0.67 | 2.00 | 1.60 | 1.67 | 1.43 | 1.14 | 1.00 | 0.83 | 1.00 | 1.33 | 3.25 | 2.83 | 2.50 | 2.40 | 0.57 | 1.00 | 1.00 | 1.80 | 0.80 | 0.86 | 0.43 | 1.19 | 14.12 |
| c | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.00 | 0.29 | 0.71 | 0.83 | 1.00 | 1.14 | 0.83 | 0.25 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.18 | 2.16 |
| CV | 43.50 | 41.33 | 62.20 | 64.40 | 71.29 | 98.57 | 103.00 | 108.00 | 106.67 | 87.67 | 74.00 | 157.00 | 150.00 | 108.33 | 124.43 | 136.14 | 146.67 | 162.50 | 182.29 | 166.83 | 189.50 | 183.50 | 198.17 | 211.40 | 150.00 | 124.43 | 142.00 | 112.40 | 124.00 | 89.14 | 86.71 | 122.78 | 100 |
| CVn | 20.00 | 20.83 | 35.80 | 39.80 | 38.14 | 51.29 | 42.00 | 51.50 | 46.00 | 42.67 | 49.17 | 118.00 | 121.20 | 79.50 | 83.71 | 83.57 | 81.50 | 76.33 | 92.00 | 85.00 | 93.25 | 82.00 | 90.67 | 84.00 | 66.14 | 64.43 | 75.80 | 59.20 | 58.80 | 51.14 | 59.14 | 65.89 | 53.67 |
| CVs | 23.50 | 20.50 | 26.40 | 24.60 | 33.14 | 47.29 | 61.00 | 56.50 | 60.67 | 45.00 | 24.83 | 39.00 | 28.80 | 28.83 | 40.71 | 52.57 | 65.17 | 86.17 | 90.29 | 81.83 | 96.25 | 101.50 | 107.50 | 127.40 | 83.86 | 60.00 | 66.20 | 53.20 | 65.20 | 38.00 | 27.57 | 56.89 | 46.33 |
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