Statistics of sunspot activity
April, 1998
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 | 75.00 | 67.75 | 72.75 | 64.25 | 73.25 | 72.50 | 140.00 | 131.50 | 179.50 | 145.00 | 127.50 | 98.50 | 81.67 | 56.75 | 77.25 | 59.50 | 68.67 | 28.33 | 33.50 | 33.33 | 46.00 | 39.00 | 34.33 | 23.25 | 23.25 | 21.00 | 26.67 | 40.75 | 48.00 | 70.25 | 68.63 | 100 |
| Wn | 6.00 | 0.00 | 0.00 | 0.00 | 0.00 | 2.75 | 29.00 | 22.00 | 28.50 | 0.00 | 0.00 | 0.00 | 0.00 | 11.00 | 18.75 | 18.50 | 32.00 | 28.33 | 33.50 | 33.33 | 42.33 | 39.00 | 26.67 | 15.00 | 3.00 | 0.00 | 3.67 | 0.00 | 3.67 | 25.25 | 14.08 | 20.51 |
| Ws | 69.00 | 67.75 | 72.75 | 64.25 | 73.25 | 69.75 | 111.00 | 109.50 | 151.00 | 145.00 | 127.50 | 98.50 | 81.67 | 45.75 | 58.50 | 41.00 | 36.67 | 0.00 | 0.00 | 0.00 | 3.67 | 0.00 | 7.67 | 8.25 | 20.25 | 21.00 | 23.00 | 40.75 | 44.33 | 45.00 | 54.56 | 79.49 |
| n | 4.00 | 4.00 | 4.00 | 3.50 | 4.50 | 4.50 | 9.00 | 8.00 | 10.50 | 7.00 | 7.00 | 6.50 | 6.00 | 4.00 | 5.00 | 4.25 | 5.00 | 2.00 | 2.00 | 2.00 | 3.00 | 2.75 | 2.67 | 2.00 | 1.75 | 1.25 | 1.67 | 2.50 | 2.67 | 4.00 | 4.23 | 100 |
| A | 0.25 | 0.50 | 0.25 | 0.25 | 0.25 | 0.25 | 0.00 | 2.00 | 3.00 | 0.00 | 0.00 | 0.75 | 1.33 | 0.75 | 0.50 | 0.75 | 0.67 | 1.00 | 0.00 | 1.00 | 1.33 | 1.25 | 1.33 | 1.50 | 0.50 | 0.25 | 0.33 | 0.25 | 1.00 | 1.25 | 0.75 | 17.72 |
| B | 0.75 | 0.50 | 0.50 | 0.75 | 1.00 | 0.25 | 2.33 | 0.00 | 1.50 | 1.00 | 2.00 | 2.75 | 1.67 | 1.25 | 1.00 | 1.50 | 2.00 | 0.00 | 1.00 | 0.00 | 0.67 | 0.50 | 0.33 | 0.50 | 0.25 | 0.00 | 0.33 | 1.00 | 0.67 | 1.00 | 0.90 | 21.26 |
| C | 0.75 | 1.25 | 1.25 | 2.00 | 1.25 | 0.00 | 1.00 | 0.50 | 2.00 | 3.00 | 2.50 | 1.00 | 2.00 | 0.75 | 1.50 | 0.25 | 1.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 1.00 | 0.00 | 0.50 | 0.75 | 1.00 | 1.00 | 0.67 | 1.50 | 0.96 | 22.57 |
| D | 0.25 | 0.25 | 0.50 | 0.25 | 1.25 | 2.00 | 2.00 | 3.00 | 2.50 | 2.00 | 1.50 | 0.50 | 0.00 | 0.25 | 1.00 | 0.75 | 0.33 | 1.00 | 0.75 | 1.00 | 0.67 | 0.50 | 0.00 | 0.00 | 0.50 | 0.25 | 0.00 | 0.25 | 0.33 | 0.25 | 0.79 | 18.77 |
| E | 0.75 | 0.50 | 0.25 | 0.00 | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.06 | 1.44 |
| F | 0.25 | 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 | 0.02 | 0.39 |
| G | 0.75 | 1.00 | 0.25 | 0.25 | 0.00 | 0.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.25 | 1.00 | 0.75 | 0.75 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.39 | 9.32 |
| H | 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 | 0.25 | 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 | 0.02 | 0.39 |
| I | 0.25 | 0.00 | 0.50 | 0.00 | 0.75 | 2.00 | 2.33 | 1.50 | 0.50 | 0.00 | 0.00 | 0.25 | 0.00 | 0.25 | 0.00 | 1.00 | 1.00 | 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 | 0.34 | 8.14 |
| x | 1.00 | 1.00 | 0.75 | 1.00 | 1.25 | 0.50 | 2.33 | 2.00 | 4.50 | 1.00 | 2.00 | 3.50 | 3.00 | 2.00 | 1.50 | 2.25 | 2.67 | 1.00 | 1.00 | 1.00 | 2.00 | 1.75 | 1.67 | 2.00 | 0.75 | 0.25 | 0.67 | 1.25 | 1.67 | 2.25 | 1.65 | 38.98 |
| r | 0.00 | 0.25 | 0.00 | 0.25 | 0.00 | 0.00 | 0.33 | 0.00 | 1.00 | 1.00 | 1.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.75 | 0.21 | 4.99 |
| s | 1.00 | 1.00 | 1.75 | 1.75 | 2.50 | 2.50 | 3.67 | 4.00 | 2.50 | 2.00 | 2.50 | 2.75 | 3.00 | 1.75 | 1.75 | 1.25 | 2.00 | 0.67 | 1.00 | 0.67 | 0.33 | 0.25 | 0.67 | 0.00 | 0.75 | 0.25 | 0.00 | 0.00 | 0.33 | 0.00 | 1.42 | 33.53 |
| a | 1.00 | 1.50 | 1.00 | 0.50 | 0.50 | 1.00 | 1.67 | 1.50 | 2.00 | 2.00 | 0.50 | 0.00 | 0.00 | 0.25 | 1.25 | 0.75 | 0.00 | 0.33 | 0.00 | 0.33 | 0.33 | 0.75 | 0.00 | 0.00 | 0.25 | 0.25 | 0.33 | 0.00 | 0.00 | 0.00 | 0.60 | 14.17 |
| h | 0.75 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.33 | 0.00 | 0.50 | 1.00 | 0.50 | 0.25 | 0.00 | 0.00 | 0.50 | 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 | 0.33 | 0.50 | 0.16 | 3.87 |
| k | 0.25 | 0.25 | 0.50 | 0.00 | 0.00 | 0.50 | 0.67 | 0.50 | 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 | 0.50 | 0.67 | 1.00 | 0.33 | 0.50 | 0.19 | 4.46 |
| x | 0.50 | 0.50 | 1.00 | 0.25 | 1.00 | 2.25 | 2.33 | 3.50 | 3.50 | 0.00 | 0.00 | 1.00 | 1.33 | 1.00 | 0.75 | 1.75 | 1.67 | 1.00 | 0.00 | 1.00 | 1.33 | 1.25 | 1.33 | 1.50 | 0.50 | 0.25 | 0.33 | 0.25 | 1.00 | 1.25 | 1.11 | 26.25 |
| o | 2.50 | 2.25 | 2.25 | 3.25 | 3.00 | 1.50 | 6.33 | 3.50 | 6.50 | 6.00 | 7.00 | 5.50 | 4.67 | 3.00 | 4.00 | 2.50 | 3.33 | 1.00 | 2.00 | 1.00 | 1.67 | 1.50 | 1.33 | 0.50 | 1.25 | 1.00 | 1.33 | 2.00 | 1.67 | 2.50 | 2.86 | 67.59 |
| i | 0.75 | 1.00 | 0.50 | 0.00 | 0.50 | 0.50 | 0.33 | 0.00 | 0.50 | 1.00 | 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 | 0.25 | 0.19 | 4.40 |
| c | 0.25 | 0.25 | 0.25 | 0.00 | 0.00 | 0.25 | 0.00 | 1.00 | 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 | 0.00 | 0.00 | 0.08 | 1.77 |
| CV | 87.00 | 61.75 | 66.25 | 33.50 | 60.75 | 79.75 | 133.67 | 132.50 | 118.50 | 129.00 | 98.00 | 70.75 | 52.67 | 38.25 | 73.50 | 31.50 | 32.00 | 24.00 | 23.50 | 24.00 | 22.00 | 23.25 | 11.00 | 2.50 | 18.25 | 26.75 | 29.00 | 45.75 | 35.00 | 49.25 | 54.45 | 100 |
| CVn | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 5.67 | 2.00 | 3.00 | 0.00 | 0.00 | 0.00 | 0.00 | 3.50 | 19.25 | 17.75 | 12.33 | 24.00 | 23.50 | 24.00 | 21.67 | 23.25 | 10.00 | 1.75 | 0.50 | 0.00 | 0.33 | 0.00 | 0.33 | 5.75 | 6.66 | 12.23 |
| CVs | 86.00 | 61.75 | 66.25 | 33.50 | 60.75 | 79.50 | 128.00 | 130.50 | 115.50 | 129.00 | 98.00 | 70.75 | 52.67 | 34.75 | 54.25 | 13.75 | 19.67 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 1.00 | 0.75 | 17.75 | 26.75 | 28.67 | 45.75 | 34.67 | 43.50 | 47.79 | 87.77 |
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