Statistics of sunspot activity
April, 1992
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 | 146.60 | 110.50 | 97.20 | 75.29 | 73.83 | 64.60 | 77.83 | 70.17 | 65.80 | 68.83 | 67.67 | 82.60 | 93.40 | 101.67 | 108.00 | 131.60 | 154.25 | 173.17 | 201.80 | 237.60 | 254.50 | 233.50 | 224.50 | 193.67 | 189.20 | 144.00 | 117.80 | 138.20 | 139.20 | 132.40 | 132.31 | 100 |
| Wn | 47.40 | 43.00 | 41.80 | 34.71 | 20.33 | 14.60 | 13.67 | 0.00 | 0.00 | 8.33 | 8.00 | 15.20 | 25.00 | 37.33 | 33.75 | 36.00 | 41.50 | 37.83 | 46.40 | 48.00 | 46.67 | 38.83 | 52.17 | 57.00 | 62.00 | 64.83 | 59.60 | 49.20 | 40.40 | 45.00 | 35.62 | 26.92 |
| Ws | 99.20 | 67.50 | 55.40 | 40.57 | 53.50 | 50.00 | 64.17 | 70.17 | 65.80 | 60.50 | 59.67 | 67.40 | 68.40 | 64.33 | 74.25 | 95.60 | 112.75 | 135.33 | 155.40 | 189.60 | 207.83 | 194.67 | 172.33 | 136.67 | 127.20 | 79.17 | 58.20 | 89.00 | 98.80 | 87.40 | 96.69 | 73.08 |
| n | 5.20 | 5.50 | 5.00 | 4.43 | 4.00 | 3.40 | 4.00 | 3.33 | 3.80 | 3.83 | 4.00 | 5.40 | 5.20 | 5.33 | 6.00 | 7.60 | 8.25 | 9.33 | 9.60 | 10.40 | 10.83 | 9.83 | 9.67 | 8.83 | 9.80 | 8.50 | 6.80 | 9.00 | 8.20 | 7.20 | 6.74 | 100 |
| A | 0.40 | 0.25 | 0.00 | 0.14 | 0.83 | 0.00 | 0.33 | 0.50 | 0.40 | 0.50 | 0.00 | 1.20 | 0.40 | 0.33 | 0.50 | 1.00 | 1.25 | 2.17 | 1.20 | 0.80 | 0.67 | 0.83 | 0.83 | 0.17 | 1.20 | 0.83 | 0.40 | 1.80 | 2.60 | 0.80 | 0.74 | 11.05 |
| B | 0.00 | 0.50 | 0.00 | 0.14 | 0.33 | 0.40 | 0.83 | 0.33 | 0.40 | 0.17 | 0.00 | 0.80 | 0.80 | 0.67 | 0.75 | 1.40 | 0.50 | 0.50 | 0.80 | 1.20 | 1.50 | 0.67 | 1.00 | 1.50 | 1.20 | 0.83 | 1.40 | 1.80 | 1.60 | 3.00 | 0.83 | 12.37 |
| C | 0.20 | 0.25 | 0.20 | 0.57 | 0.17 | 1.00 | 0.00 | 0.50 | 1.60 | 1.50 | 1.00 | 1.80 | 1.20 | 1.33 | 1.75 | 1.60 | 2.25 | 1.50 | 1.40 | 2.60 | 2.83 | 1.83 | 1.33 | 2.17 | 1.60 | 2.17 | 3.20 | 2.00 | 1.20 | 0.60 | 1.38 | 20.44 |
| D | 2.40 | 2.25 | 2.00 | 1.29 | 1.17 | 1.20 | 1.33 | 0.50 | 0.60 | 0.83 | 1.00 | 0.60 | 1.80 | 1.83 | 1.00 | 0.40 | 1.25 | 2.67 | 2.80 | 2.20 | 1.33 | 2.33 | 3.17 | 2.83 | 4.20 | 3.50 | 1.80 | 1.60 | 1.80 | 2.00 | 1.79 | 26.54 |
| E | 0.20 | 0.00 | 0.20 | 0.00 | 0.00 | 0.00 | 0.83 | 0.67 | 0.00 | 0.17 | 0.00 | 0.20 | 0.00 | 0.17 | 0.00 | 0.40 | 0.50 | 0.67 | 1.00 | 0.40 | 1.17 | 0.83 | 1.33 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.30 | 4.48 |
| F | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.04 | 0.66 |
| G | 1.20 | 2.00 | 2.60 | 1.86 | 0.83 | 0.80 | 0.33 | 0.17 | 0.40 | 0.17 | 0.00 | 0.00 | 0.00 | 0.50 | 1.25 | 1.20 | 0.50 | 0.50 | 0.80 | 1.40 | 0.83 | 1.17 | 1.33 | 1.67 | 1.20 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.77 | 11.39 |
| H | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.20 | 0.17 | 0.33 | 0.00 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.40 | 0.33 | 0.33 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.00 | 0.00 | 0.11 | 1.63 |
| I | 0.60 | 0.25 | 0.00 | 0.43 | 0.67 | 0.00 | 0.17 | 0.33 | 0.20 | 0.33 | 1.67 | 0.80 | 0.80 | 0.50 | 0.50 | 1.60 | 1.75 | 1.33 | 1.20 | 1.40 | 2.17 | 1.50 | 0.50 | 0.00 | 0.40 | 0.83 | 0.00 | 1.40 | 1.00 | 0.80 | 0.77 | 11.43 |
| x | 0.40 | 0.75 | 0.00 | 0.29 | 1.17 | 0.40 | 1.17 | 0.83 | 0.80 | 0.67 | 0.00 | 2.00 | 1.20 | 1.00 | 1.25 | 2.40 | 1.75 | 2.67 | 2.00 | 2.00 | 2.17 | 1.50 | 1.83 | 1.67 | 2.40 | 1.67 | 1.80 | 3.60 | 4.20 | 3.80 | 1.58 | 23.42 |
| r | 0.00 | 0.50 | 0.20 | 0.14 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.33 | 0.20 | 0.40 | 0.17 | 0.25 | 0.00 | 0.50 | 0.17 | 0.20 | 1.00 | 0.50 | 0.67 | 0.33 | 0.33 | 0.20 | 0.17 | 0.40 | 0.60 | 0.20 | 0.40 | 0.27 | 4.05 |
| s | 0.80 | 0.75 | 0.80 | 1.43 | 1.33 | 2.00 | 1.17 | 1.33 | 2.00 | 1.33 | 2.33 | 1.60 | 1.00 | 1.67 | 1.25 | 1.80 | 2.00 | 3.33 | 3.00 | 1.80 | 4.00 | 2.00 | 0.83 | 1.67 | 2.80 | 2.33 | 1.40 | 1.80 | 1.00 | 0.40 | 1.70 | 25.19 |
| a | 2.80 | 2.50 | 3.00 | 1.71 | 1.00 | 1.00 | 1.17 | 0.50 | 0.60 | 1.00 | 0.33 | 1.20 | 1.00 | 1.50 | 2.25 | 3.20 | 4.00 | 3.17 | 2.80 | 3.60 | 2.67 | 3.83 | 5.17 | 3.50 | 3.80 | 4.17 | 2.40 | 2.20 | 2.80 | 2.60 | 2.38 | 35.33 |
| h | 0.20 | 0.25 | 0.40 | 0.29 | 0.00 | 0.00 | 0.33 | 0.00 | 0.20 | 0.17 | 0.00 | 0.20 | 0.60 | 0.50 | 0.75 | 0.20 | 0.00 | 0.00 | 0.00 | 0.40 | 0.17 | 0.17 | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 2.48 |
| k | 1.00 | 0.75 | 0.60 | 0.57 | 0.33 | 0.00 | 0.17 | 0.67 | 0.20 | 0.50 | 1.00 | 0.20 | 1.00 | 0.50 | 0.25 | 0.00 | 0.00 | 0.00 | 1.60 | 1.60 | 1.33 | 1.67 | 1.50 | 1.67 | 0.40 | 0.17 | 0.80 | 0.80 | 0.00 | 0.00 | 0.64 | 9.53 |
| x | 1.20 | 0.50 | 0.00 | 0.57 | 1.50 | 0.00 | 0.50 | 1.00 | 0.80 | 1.00 | 2.00 | 2.00 | 1.40 | 0.83 | 1.00 | 2.60 | 3.00 | 3.50 | 2.80 | 2.60 | 3.17 | 2.67 | 1.50 | 0.17 | 1.60 | 1.67 | 0.40 | 3.60 | 3.60 | 1.60 | 1.63 | 24.11 |
| o | 2.80 | 4.25 | 4.40 | 3.71 | 2.50 | 3.20 | 2.50 | 1.50 | 2.60 | 2.50 | 1.67 | 2.60 | 2.80 | 4.17 | 4.75 | 4.40 | 3.50 | 4.67 | 5.40 | 5.80 | 5.67 | 5.17 | 5.83 | 7.00 | 7.00 | 6.33 | 5.20 | 4.40 | 3.20 | 4.00 | 4.12 | 61.06 |
| i | 1.20 | 0.75 | 0.60 | 0.14 | 0.00 | 0.20 | 1.00 | 0.83 | 0.40 | 0.33 | 0.33 | 0.80 | 1.00 | 0.33 | 0.25 | 0.60 | 1.75 | 1.00 | 1.00 | 2.00 | 1.83 | 1.83 | 2.00 | 1.17 | 0.80 | 0.17 | 1.00 | 0.60 | 1.20 | 1.40 | 0.88 | 13.11 |
| 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.40 | 0.00 | 0.17 | 0.17 | 0.33 | 0.50 | 0.40 | 0.33 | 0.20 | 0.40 | 0.20 | 0.20 | 0.12 | 1.71 |
| CV | 120.40 | 118.50 | 128.40 | 100.71 | 60.33 | 56.80 | 78.83 | 65.83 | 57.40 | 61.83 | 77.00 | 56.40 | 103.80 | 99.50 | 106.25 | 81.60 | 91.50 | 116.50 | 175.00 | 180.40 | 168.83 | 184.17 | 181.50 | 174.33 | 161.60 | 115.83 | 93.60 | 96.40 | 64.60 | 61.00 | 107.96 | 100 |
| CVn | 46.00 | 51.25 | 63.60 | 53.29 | 26.67 | 20.40 | 19.00 | 0.00 | 0.00 | 1.33 | 4.67 | 2.60 | 16.80 | 25.00 | 23.75 | 21.40 | 16.75 | 18.67 | 48.40 | 51.00 | 36.83 | 38.33 | 35.33 | 49.83 | 65.00 | 47.00 | 32.60 | 24.40 | 13.80 | 7.60 | 28.71 | 26.59 |
| CVs | 74.40 | 67.25 | 64.80 | 47.43 | 33.67 | 36.40 | 59.83 | 65.83 | 57.40 | 60.50 | 72.33 | 53.80 | 87.00 | 74.50 | 82.50 | 60.20 | 74.75 | 97.83 | 126.60 | 129.40 | 132.00 | 145.83 | 146.17 | 124.50 | 96.60 | 68.83 | 61.00 | 72.00 | 50.80 | 53.40 | 79.25 | 73.41 |
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