Statistics of sunspot activity
April, 1989
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 | 149.80 | 157.33 | 182.60 | 153.67 | 105.86 | 139.38 | 192.75 | 208.20 | 181.33 | 134.83 | 152.50 | 113.00 | 103.00 | 124.33 | 144.50 | 121.57 | 189.83 | 164.43 | 183.86 | 200.57 | 192.86 | 195.57 | 175.50 | 159.83 | 142.86 | 151.00 | 144.80 | 137.67 | 136.67 | 111.60 | 155.06 | 100 |
| Wn | 59.20 | 57.83 | 55.80 | 48.67 | 30.00 | 58.13 | 95.00 | 109.20 | 92.83 | 56.33 | 63.75 | 48.67 | 67.00 | 73.00 | 84.33 | 63.57 | 107.17 | 84.14 | 99.43 | 124.86 | 103.29 | 90.71 | 92.00 | 73.00 | 52.43 | 47.40 | 40.20 | 40.50 | 45.17 | 48.20 | 70.39 | 45.40 |
| Ws | 90.60 | 99.50 | 126.80 | 105.00 | 75.86 | 81.25 | 97.75 | 99.00 | 88.50 | 78.50 | 88.75 | 64.33 | 36.00 | 51.33 | 60.17 | 58.00 | 82.67 | 80.29 | 84.43 | 75.71 | 89.57 | 104.86 | 83.50 | 86.83 | 90.43 | 103.60 | 104.60 | 97.17 | 91.50 | 63.40 | 84.66 | 54.60 |
| n | 8.20 | 8.83 | 9.00 | 7.50 | 5.86 | 8.00 | 11.25 | 11.40 | 11.17 | 8.00 | 10.75 | 7.33 | 6.57 | 6.83 | 6.67 | 6.43 | 7.83 | 7.00 | 8.00 | 9.29 | 10.57 | 11.14 | 8.75 | 8.17 | 7.86 | 8.20 | 6.60 | 6.50 | 6.17 | 6.00 | 8.20 | 100 |
| A | 2.00 | 2.33 | 1.40 | 1.50 | 0.71 | 2.13 | 1.50 | 0.80 | 1.83 | 0.50 | 3.25 | 1.50 | 0.71 | 1.17 | 0.50 | 1.14 | 0.50 | 0.00 | 0.14 | 0.29 | 1.00 | 1.00 | 1.00 | 0.67 | 0.29 | 1.40 | 1.20 | 0.83 | 0.33 | 0.40 | 1.07 | 13.03 |
| B | 2.20 | 2.83 | 4.20 | 2.17 | 1.14 | 0.75 | 1.75 | 2.00 | 2.00 | 1.67 | 0.75 | 1.17 | 1.57 | 1.67 | 1.33 | 0.71 | 0.50 | 0.00 | 0.43 | 1.86 | 0.57 | 1.00 | 0.75 | 1.67 | 1.71 | 1.20 | 1.00 | 1.17 | 1.33 | 1.20 | 1.41 | 17.20 |
| C | 1.60 | 1.17 | 1.60 | 1.33 | 0.86 | 1.38 | 4.00 | 3.80 | 2.33 | 2.33 | 2.00 | 0.83 | 1.00 | 1.50 | 1.83 | 0.43 | 2.00 | 1.71 | 2.29 | 2.71 | 4.57 | 4.43 | 2.75 | 1.33 | 2.71 | 2.40 | 0.80 | 1.50 | 2.00 | 1.20 | 2.01 | 24.57 |
| D | 0.00 | 0.17 | 0.00 | 0.67 | 1.14 | 2.00 | 2.75 | 3.40 | 3.33 | 1.17 | 1.50 | 2.00 | 1.43 | 0.33 | 0.33 | 0.86 | 1.50 | 1.43 | 1.71 | 1.29 | 0.86 | 2.29 | 2.00 | 3.33 | 1.43 | 0.20 | 0.00 | 0.00 | 0.00 | 0.40 | 1.25 | 15.26 |
| E | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.17 | 0.17 | 0.00 | 0.00 | 0.00 | 1.17 | 1.67 | 1.14 | 1.67 | 1.00 | 0.57 | 0.43 | 0.14 | 0.00 | 0.50 | 0.67 | 0.86 | 1.80 | 2.20 | 1.50 | 0.67 | 0.00 | 0.55 | 6.71 |
| F | 0.60 | 1.00 | 1.00 | 1.00 | 0.86 | 0.75 | 0.75 | 0.20 | 0.17 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.14 | 0.50 | 0.29 | 0.29 | 0.57 | 1.00 | 0.57 | 0.75 | 0.33 | 0.14 | 0.20 | 0.20 | 0.17 | 0.50 | 0.80 | 0.44 | 5.40 |
| G | 0.40 | 0.00 | 0.00 | 0.17 | 0.00 | 0.13 | 0.25 | 0.80 | 1.00 | 1.00 | 0.75 | 0.00 | 0.86 | 0.83 | 0.17 | 0.71 | 0.17 | 1.57 | 1.29 | 1.14 | 0.29 | 0.43 | 0.00 | 0.17 | 0.57 | 0.60 | 0.60 | 1.33 | 0.50 | 0.80 | 0.55 | 6.72 |
| H | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.17 | 0.14 | 0.57 | 0.71 | 1.00 | 0.29 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.13 | 1.63 |
| I | 1.40 | 1.33 | 0.80 | 0.67 | 1.00 | 0.63 | 0.25 | 0.20 | 0.33 | 0.83 | 2.50 | 1.83 | 1.00 | 0.17 | 0.67 | 1.14 | 0.83 | 0.86 | 0.71 | 0.29 | 1.14 | 1.14 | 0.75 | 0.00 | 0.14 | 0.40 | 0.60 | 0.00 | 0.50 | 1.20 | 0.78 | 9.49 |
| x | 4.20 | 5.17 | 5.60 | 3.67 | 1.86 | 2.88 | 3.25 | 2.80 | 3.83 | 2.17 | 4.00 | 2.67 | 2.29 | 2.83 | 1.83 | 1.86 | 1.00 | 0.00 | 0.57 | 2.14 | 1.57 | 2.00 | 1.75 | 2.33 | 2.00 | 2.60 | 2.20 | 2.00 | 1.67 | 1.60 | 2.48 | 30.23 |
| r | 1.00 | 0.50 | 0.80 | 0.17 | 0.29 | 0.38 | 0.50 | 0.20 | 0.50 | 0.33 | 1.00 | 0.83 | 0.57 | 0.17 | 0.50 | 0.43 | 0.33 | 0.00 | 0.00 | 0.14 | 0.86 | 0.43 | 0.75 | 0.50 | 0.43 | 0.80 | 0.00 | 0.50 | 0.50 | 0.00 | 0.45 | 5.45 |
| s | 2.00 | 1.83 | 0.60 | 2.33 | 1.00 | 2.13 | 1.50 | 1.80 | 2.33 | 1.83 | 2.75 | 1.17 | 1.00 | 1.67 | 2.17 | 0.86 | 1.00 | 1.71 | 1.14 | 1.29 | 2.00 | 3.43 | 1.25 | 1.17 | 1.14 | 2.80 | 1.20 | 0.83 | 1.00 | 2.20 | 1.64 | 19.98 |
| a | 0.00 | 0.33 | 0.80 | 0.33 | 1.71 | 1.38 | 4.75 | 4.40 | 2.50 | 2.00 | 2.50 | 2.67 | 2.29 | 1.17 | 1.00 | 1.86 | 3.00 | 2.29 | 2.29 | 1.86 | 2.43 | 3.29 | 2.75 | 3.00 | 2.86 | 0.20 | 1.20 | 1.00 | 1.17 | 1.20 | 1.94 | 23.67 |
| h | 0.00 | 0.17 | 0.20 | 0.00 | 0.43 | 0.38 | 0.25 | 0.40 | 0.50 | 0.33 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.57 | 0.86 | 1.14 | 1.57 | 1.00 | 0.75 | 0.50 | 1.00 | 0.80 | 1.40 | 1.33 | 1.33 | 0.80 | 0.55 | 6.70 |
| k | 1.00 | 0.83 | 1.00 | 1.00 | 0.57 | 0.88 | 1.00 | 1.80 | 1.50 | 1.33 | 0.25 | 0.00 | 0.43 | 1.00 | 1.17 | 1.43 | 2.00 | 2.43 | 3.14 | 2.71 | 2.14 | 1.00 | 1.50 | 0.67 | 0.43 | 1.00 | 0.60 | 0.83 | 0.50 | 0.20 | 1.14 | 13.97 |
| x | 3.40 | 3.67 | 2.20 | 2.17 | 1.86 | 3.00 | 1.75 | 1.00 | 2.17 | 1.33 | 5.75 | 3.33 | 1.71 | 1.33 | 1.17 | 2.43 | 1.50 | 1.00 | 1.43 | 1.29 | 3.14 | 2.43 | 2.00 | 0.67 | 0.43 | 1.80 | 1.80 | 0.83 | 1.17 | 1.60 | 1.98 | 24.14 |
| o | 4.20 | 4.17 | 5.80 | 4.17 | 3.00 | 3.88 | 8.50 | 9.40 | 8.00 | 5.67 | 4.75 | 3.83 | 4.57 | 4.00 | 3.50 | 2.71 | 3.83 | 4.29 | 4.57 | 6.71 | 5.57 | 6.86 | 3.75 | 5.17 | 5.71 | 4.20 | 2.40 | 4.00 | 3.50 | 3.20 | 4.80 | 58.53 |
| i | 0.60 | 1.00 | 1.00 | 1.17 | 0.86 | 1.13 | 1.00 | 0.80 | 0.83 | 1.00 | 0.25 | 0.17 | 0.29 | 1.50 | 2.00 | 1.29 | 2.50 | 1.71 | 1.86 | 1.14 | 1.86 | 1.86 | 3.00 | 2.33 | 1.71 | 2.20 | 2.40 | 1.67 | 1.50 | 1.20 | 1.39 | 17.01 |
| c | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.00 | 0.00 | 0.20 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.03 | 0.32 |
| CV | 78.80 | 83.33 | 82.20 | 92.83 | 91.00 | 122.88 | 151.75 | 195.80 | 181.50 | 131.83 | 103.75 | 62.50 | 76.00 | 98.17 | 108.67 | 112.57 | 175.17 | 195.57 | 224.14 | 217.86 | 218.86 | 191.43 | 171.75 | 142.33 | 134.29 | 146.20 | 142.40 | 142.67 | 120.33 | 100.60 | 136.57 | 100 |
| CVn | 17.40 | 24.50 | 9.00 | 13.33 | 19.00 | 38.50 | 65.25 | 102.20 | 96.17 | 54.50 | 48.00 | 34.67 | 53.57 | 71.17 | 69.33 | 55.57 | 80.17 | 93.57 | 122.00 | 121.29 | 111.57 | 92.57 | 84.25 | 63.67 | 38.00 | 26.80 | 14.80 | 20.17 | 20.00 | 29.80 | 56.36 | 41.27 |
| CVs | 61.40 | 58.83 | 73.20 | 79.50 | 72.00 | 84.38 | 86.50 | 93.60 | 85.33 | 77.33 | 55.75 | 27.83 | 22.43 | 27.00 | 39.33 | 57.00 | 95.00 | 102.00 | 102.14 | 96.57 | 107.29 | 98.86 | 87.50 | 78.67 | 96.29 | 119.40 | 127.60 | 122.50 | 100.33 | 70.80 | 80.21 | 58.73 |
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