Statistics of sunspot activity
April, 1993
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 | 102.17 | 92.50 | 103.00 | 95.83 | 99.80 | 125.80 | 99.20 | 109.80 | 125.80 | 124.50 | 69.00 | 48.00 | 34.00 | 26.50 | 25.00 | 32.67 | 51.00 | 71.67 | 98.20 | 143.00 | 150.33 | 133.50 | 129.60 | 143.80 | 143.60 | 73.83 | 89.17 | 61.17 | 59.80 | 41.40 | 90.12 | 100 |
| Wn | 36.67 | 27.50 | 18.75 | 12.83 | 12.00 | 11.40 | 2.20 | 10.00 | 29.20 | 43.33 | 33.20 | 28.67 | 25.00 | 21.00 | 25.00 | 28.67 | 43.60 | 42.00 | 44.60 | 68.00 | 58.17 | 52.00 | 53.00 | 61.60 | 73.60 | 41.33 | 36.33 | 25.50 | 14.80 | 13.00 | 33.10 | 36.73 |
| Ws | 65.50 | 65.00 | 84.25 | 83.00 | 87.80 | 114.40 | 97.00 | 99.80 | 96.60 | 81.17 | 35.80 | 19.33 | 9.00 | 5.50 | 0.00 | 4.00 | 7.40 | 29.67 | 53.60 | 75.00 | 92.17 | 81.50 | 76.60 | 82.20 | 70.00 | 32.50 | 52.83 | 35.67 | 45.00 | 28.40 | 57.02 | 63.27 |
| n | 5.50 | 4.67 | 5.75 | 6.00 | 6.00 | 6.00 | 4.00 | 3.60 | 4.80 | 5.67 | 3.40 | 3.00 | 2.67 | 1.83 | 1.60 | 2.33 | 3.60 | 4.50 | 5.80 | 7.20 | 6.00 | 6.17 | 6.40 | 7.40 | 9.00 | 4.50 | 5.83 | 4.00 | 4.00 | 3.20 | 4.81 | 100 |
| A | 1.17 | 0.17 | 0.25 | 0.17 | 0.40 | 0.20 | 0.60 | 0.20 | 0.00 | 0.67 | 0.80 | 0.00 | 1.33 | 0.83 | 0.60 | 0.67 | 0.60 | 1.50 | 2.20 | 1.40 | 0.67 | 0.50 | 1.00 | 0.80 | 2.20 | 1.00 | 0.83 | 0.17 | 0.00 | 0.60 | 0.72 | 14.90 |
| B | 0.50 | 0.50 | 0.75 | 0.50 | 0.00 | 0.00 | 0.40 | 0.60 | 0.80 | 1.33 | 0.40 | 1.33 | 1.00 | 0.83 | 0.60 | 1.00 | 1.60 | 1.17 | 1.60 | 1.80 | 0.50 | 0.17 | 1.00 | 2.40 | 2.60 | 0.50 | 0.50 | 0.00 | 2.00 | 0.40 | 0.89 | 18.55 |
| C | 1.67 | 2.00 | 1.75 | 2.67 | 2.00 | 0.60 | 0.40 | 0.60 | 0.40 | 0.33 | 0.20 | 0.33 | 0.00 | 0.17 | 0.00 | 0.67 | 0.80 | 0.33 | 0.60 | 1.40 | 1.00 | 1.00 | 1.20 | 1.20 | 0.80 | 0.00 | 0.50 | 0.33 | 0.00 | 0.40 | 0.78 | 16.17 |
| D | 1.17 | 1.67 | 3.00 | 1.33 | 1.80 | 1.00 | 0.40 | 0.20 | 1.80 | 1.67 | 1.20 | 0.33 | 0.00 | 0.00 | 0.40 | 0.00 | 0.60 | 1.33 | 0.80 | 2.60 | 3.67 | 3.00 | 2.00 | 2.40 | 2.40 | 2.33 | 3.67 | 3.17 | 1.80 | 1.60 | 1.58 | 32.78 |
| E | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.80 | 1.20 | 1.20 | 0.80 | 1.00 | 0.60 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.17 | 0.00 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.21 | 4.41 |
| F | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 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 | 0.00 | 0.00 | 0.00 | 0.01 | 0.14 |
| G | 1.00 | 0.33 | 0.00 | 0.17 | 0.20 | 0.80 | 0.40 | 0.80 | 0.80 | 0.67 | 0.20 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.00 | 0.00 | 0.00 | 0.40 | 0.00 | 1.00 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.29 | 6.12 |
| H | 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 | 0.00 | 0.00 | 0.00 | 0.00 |
| I | 0.00 | 0.00 | 0.00 | 1.17 | 1.60 | 2.60 | 0.60 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.17 | 1.33 | 0.80 | 0.20 | 0.00 | 0.00 | 0.33 | 0.33 | 0.20 | 0.20 | 0.33 | 6.95 |
| x | 1.67 | 0.67 | 1.00 | 0.67 | 0.40 | 0.20 | 1.00 | 0.80 | 0.80 | 2.00 | 1.20 | 1.33 | 2.33 | 1.67 | 1.20 | 1.67 | 2.20 | 2.67 | 3.80 | 3.20 | 1.17 | 0.67 | 2.00 | 3.20 | 4.80 | 1.50 | 1.33 | 0.17 | 2.00 | 1.00 | 1.61 | 33.44 |
| r | 0.33 | 0.00 | 0.75 | 0.33 | 0.20 | 0.20 | 0.20 | 0.40 | 0.20 | 0.33 | 0.00 | 0.00 | 0.33 | 0.17 | 0.20 | 0.33 | 0.20 | 0.17 | 0.00 | 1.00 | 0.33 | 0.33 | 0.60 | 0.40 | 0.20 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.25 | 5.23 |
| s | 0.67 | 0.67 | 0.75 | 1.67 | 2.40 | 3.20 | 0.80 | 0.40 | 0.20 | 0.67 | 0.40 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.17 | 0.60 | 1.20 | 1.33 | 3.17 | 0.80 | 0.60 | 1.60 | 0.83 | 1.17 | 1.17 | 1.00 | 0.80 | 0.90 | 18.78 |
| a | 2.17 | 2.17 | 2.75 | 3.33 | 2.60 | 2.00 | 1.80 | 2.00 | 2.80 | 2.50 | 1.40 | 1.00 | 0.00 | 0.00 | 0.20 | 0.33 | 1.00 | 1.50 | 1.40 | 1.80 | 2.67 | 1.67 | 2.80 | 3.20 | 1.80 | 2.17 | 3.00 | 2.67 | 1.00 | 1.40 | 1.84 | 38.17 |
| h | 0.17 | 0.17 | 0.00 | 0.00 | 0.00 | 0.40 | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.03 | 0.62 |
| k | 0.50 | 1.00 | 0.50 | 0.00 | 0.40 | 0.00 | 0.20 | 0.00 | 0.80 | 0.17 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.33 | 0.20 | 0.00 | 0.60 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.18 | 3.76 |
| x | 1.17 | 0.17 | 0.25 | 1.33 | 2.00 | 2.80 | 1.20 | 0.20 | 0.00 | 0.67 | 0.80 | 0.00 | 1.67 | 0.83 | 0.60 | 0.67 | 0.60 | 1.67 | 2.20 | 1.40 | 0.83 | 1.83 | 1.80 | 1.00 | 2.20 | 1.00 | 1.17 | 0.50 | 0.20 | 0.80 | 1.05 | 21.85 |
| o | 4.33 | 4.50 | 5.00 | 4.67 | 4.00 | 2.40 | 1.40 | 2.00 | 3.60 | 4.00 | 2.00 | 3.00 | 1.00 | 1.00 | 1.00 | 1.67 | 3.00 | 2.67 | 2.80 | 4.60 | 3.17 | 2.83 | 3.00 | 5.20 | 5.60 | 2.67 | 4.00 | 3.17 | 3.80 | 2.40 | 3.15 | 65.41 |
| i | 0.00 | 0.00 | 0.50 | 0.00 | 0.00 | 0.80 | 1.40 | 1.40 | 0.80 | 1.00 | 0.60 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.80 | 1.20 | 2.00 | 1.17 | 1.20 | 1.00 | 1.00 | 0.67 | 0.67 | 0.33 | 0.00 | 0.00 | 0.56 | 11.56 |
| c | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 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 | 0.40 | 0.20 | 0.20 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.06 | 1.18 |
| CV | 76.17 | 90.50 | 85.25 | 64.83 | 83.20 | 100.00 | 59.80 | 54.40 | 102.20 | 81.00 | 56.00 | 34.67 | 4.67 | 3.33 | 8.20 | 7.00 | 22.20 | 33.50 | 42.20 | 72.80 | 105.17 | 105.67 | 77.80 | 75.00 | 107.60 | 68.67 | 84.83 | 72.33 | 45.00 | 40.60 | 62.15 | 100 |
| CVn | 27.50 | 32.00 | 21.50 | 7.33 | 8.40 | 8.80 | 0.20 | 3.80 | 21.20 | 23.17 | 21.60 | 17.67 | 3.67 | 2.83 | 8.20 | 6.67 | 21.20 | 23.67 | 24.00 | 38.60 | 50.83 | 42.33 | 31.60 | 29.60 | 71.00 | 46.50 | 44.17 | 35.00 | 23.80 | 21.40 | 23.94 | 38.52 |
| CVs | 48.67 | 58.50 | 63.75 | 57.50 | 74.80 | 91.20 | 59.60 | 50.60 | 81.00 | 57.83 | 34.40 | 17.00 | 1.00 | 0.50 | 0.00 | 0.33 | 1.00 | 9.83 | 18.20 | 34.20 | 54.33 | 63.33 | 46.20 | 45.40 | 36.60 | 22.17 | 40.67 | 37.33 | 21.20 | 19.20 | 38.21 | 61.48 |
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