Statistics of sunspot activity
April, 1983
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 | 83.17 | 89.33 | 96.50 | 77.33 | 61.60 | 73.80 | 95.67 | 85.67 | 83.60 | 86.33 | 83.17 | 82.25 | 73.00 | | | | | | 124.60 | 111.83 | 94.57 | 92.00 | 104.86 | 103.13 | 126.29 | 137.75 | 154.25 | 160.43 | 174.33 | 162.80 | 104.73 | 100 |
| Wn | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 5.50 | 10.00 | | | | | | 39.00 | 32.33 | 28.29 | 44.00 | 44.14 | 28.50 | 40.86 | 42.25 | 41.25 | 38.43 | 40.17 | 35.20 | 18.80 | 17.95 |
| Ws | 83.17 | 89.33 | 96.50 | 77.33 | 61.60 | 73.80 | 95.67 | 85.67 | 83.60 | 86.33 | 83.17 | 76.75 | 63.00 | | | | | | 85.60 | 79.50 | 66.29 | 48.00 | 60.71 | 74.63 | 85.43 | 95.50 | 113.00 | 122.00 | 134.17 | 127.60 | 85.93 | 82.05 |
| n | 5.33 | 5.50 | 6.00 | 5.33 | 3.80 | 4.60 | 5.50 | 3.83 | 3.80 | 4.17 | 4.83 | 5.50 | 4.80 | | | | | | 8.00 | 7.17 | 6.14 | 6.00 | 6.00 | 5.75 | 6.86 | 7.25 | 7.25 | 7.43 | 9.00 | 9.60 | 5.98 | 100 |
| A | 1.50 | 0.83 | 0.33 | 2.00 | 0.60 | 0.40 | 0.33 | 0.17 | 0.40 | 0.17 | 0.17 | 1.50 | 0.40 | | | | | | 0.60 | 0.67 | 0.29 | 2.00 | 1.00 | 0.50 | 0.86 | 0.25 | 0.75 | 0.00 | 0.83 | 0.80 | 0.69 | 11.60 |
| B | 2.67 | 2.00 | 2.33 | 0.67 | 0.80 | 1.00 | 1.17 | 0.67 | 0.40 | 0.33 | 0.67 | 0.75 | 0.60 | | | | | | 1.40 | 0.50 | 1.71 | 1.00 | 1.29 | 0.63 | 1.14 | 1.25 | 0.75 | 0.29 | 0.17 | 0.40 | 0.98 | 16.44 |
| C | 0.00 | 1.00 | 2.00 | 0.33 | 0.60 | 0.80 | 1.33 | 0.00 | 0.60 | 1.00 | 1.67 | 1.25 | 1.60 | | | | | | 2.40 | 3.33 | 2.00 | 1.50 | 1.71 | 1.75 | 1.14 | 1.50 | 2.50 | 1.57 | 2.00 | 2.20 | 1.43 | 23.95 |
| D | 1.00 | 1.67 | 1.33 | 1.33 | 1.60 | 1.80 | 1.33 | 1.67 | 1.80 | 1.33 | 1.50 | 1.50 | 1.20 | | | | | | 2.60 | 2.17 | 1.71 | 1.50 | 1.86 | 2.63 | 3.00 | 3.25 | 1.75 | 1.71 | 2.17 | 1.80 | 1.81 | 30.25 |
| E | 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 | 0.43 | 0.67 | 0.20 | 0.05 | 0.87 |
| F | 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 | 0.25 | 0.14 | 0.00 | 0.00 | 0.02 | 0.26 |
| G | 0.00 | 0.00 | 0.00 | 0.67 | 0.20 | 0.00 | 0.00 | 0.33 | 0.20 | 0.50 | 0.00 | 0.00 | 0.00 | | | | | | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.00 | 0.43 | 0.50 | 0.75 | 1.43 | 1.17 | 2.20 | 0.34 | 5.70 |
| H | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.00 | 0.20 | | | | | | 0.40 | 0.00 | 0.14 | 0.00 | 0.00 | 0.13 | 0.00 | 0.00 | 0.00 | 0.14 | 0.17 | 0.20 | 0.07 | 1.19 |
| I | 0.17 | 0.00 | 0.00 | 0.33 | 0.00 | 0.40 | 1.33 | 1.00 | 0.20 | 0.83 | 0.83 | 0.50 | 0.80 | | | | | | 0.60 | 0.50 | 0.29 | 0.00 | 0.00 | 0.13 | 0.29 | 0.50 | 0.50 | 1.71 | 1.83 | 1.80 | 0.58 | 9.73 |
| x | 4.17 | 2.83 | 2.67 | 2.67 | 1.40 | 1.40 | 1.50 | 0.83 | 0.80 | 0.50 | 0.83 | 2.25 | 1.00 | | | | | | 2.00 | 1.17 | 2.00 | 3.00 | 2.29 | 1.13 | 2.00 | 1.50 | 1.50 | 0.29 | 1.00 | 1.20 | 1.68 | 28.05 |
| r | 0.00 | 0.50 | 0.83 | 0.33 | 0.60 | 0.40 | 1.00 | 0.17 | 0.20 | 0.50 | 1.33 | 1.75 | 0.60 | | | | | | 1.60 | 1.17 | 1.00 | 0.50 | 0.14 | 0.13 | 0.43 | 0.50 | 0.50 | 1.71 | 1.50 | 1.20 | 0.74 | 12.44 |
| s | 0.50 | 0.67 | 1.00 | 0.67 | 0.60 | 2.20 | 2.17 | 1.17 | 1.00 | 1.50 | 2.17 | 1.00 | 2.00 | | | | | | 2.00 | 3.00 | 0.71 | 1.00 | 0.43 | 1.00 | 0.86 | 2.25 | 1.75 | 2.00 | 3.50 | 3.80 | 1.56 | 26.05 |
| a | 0.50 | 1.50 | 1.50 | 1.67 | 1.20 | 0.40 | 0.83 | 1.17 | 1.00 | 0.83 | 0.50 | 0.50 | 0.60 | | | | | | 0.60 | 0.33 | 0.57 | 0.00 | 1.43 | 1.13 | 2.29 | 1.00 | 2.25 | 2.14 | 0.83 | 1.40 | 1.05 | 17.51 |
| h | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.20 | 0.50 | 0.00 | 0.00 | 0.40 | | | | | | 0.60 | 0.33 | 0.29 | 0.50 | 0.29 | 0.25 | 0.00 | 0.50 | 0.25 | 0.29 | 0.83 | 1.40 | 0.28 | 4.68 |
| k | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.60 | 0.33 | 0.00 | 0.00 | 0.20 | | | | | | 1.20 | 1.17 | 1.57 | 1.00 | 1.43 | 2.13 | 1.29 | 1.50 | 1.00 | 1.00 | 1.33 | 0.60 | 0.67 | 11.27 |
| x | 1.67 | 0.83 | 0.33 | 2.33 | 0.60 | 1.00 | 1.67 | 1.17 | 0.80 | 1.00 | 1.00 | 2.00 | 1.40 | | | | | | 1.60 | 1.17 | 0.71 | 2.00 | 1.00 | 0.75 | 1.14 | 0.75 | 1.25 | 1.86 | 2.83 | 2.80 | 1.35 | 22.53 |
| o | 3.67 | 4.50 | 5.50 | 3.00 | 3.00 | 3.60 | 3.83 | 2.17 | 2.80 | 3.17 | 3.67 | 3.50 | 3.40 | | | | | | 5.40 | 5.00 | 4.71 | 3.50 | 4.86 | 4.88 | 5.71 | 5.00 | 4.25 | 4.14 | 4.83 | 6.40 | 4.18 | 69.92 |
| i | 0.00 | 0.17 | 0.17 | 0.00 | 0.20 | 0.00 | 0.00 | 0.50 | 0.20 | 0.00 | 0.17 | 0.00 | 0.00 | | | | | | 1.00 | 0.67 | 0.57 | 0.50 | 0.14 | 0.13 | 0.00 | 1.50 | 1.75 | 1.43 | 1.33 | 0.40 | 0.43 | 7.24 |
| 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 | 0.33 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.32 |
| CV | 35.00 | 46.50 | 47.33 | 49.00 | 43.20 | 62.20 | 54.00 | 65.33 | 71.60 | 77.50 | 56.17 | 44.25 | 67.00 | | | | | | 132.40 | 125.00 | 107.29 | 90.00 | 104.29 | 136.00 | 114.57 | 155.75 | 121.00 | 135.71 | 181.17 | 185.00 | 92.29 | 100 |
| CVn | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 12.80 | | | | | | 17.00 | 21.83 | 9.14 | 14.50 | 13.57 | 15.38 | 23.14 | 29.00 | 30.75 | 23.14 | 27.00 | 20.40 | 10.33 | 11.19 |
| CVs | 35.00 | 46.50 | 47.33 | 49.00 | 43.20 | 62.20 | 54.00 | 65.33 | 71.60 | 77.50 | 56.17 | 43.75 | 54.20 | | | | | | 115.40 | 103.17 | 98.14 | 75.50 | 90.71 | 120.63 | 91.43 | 126.75 | 90.25 | 112.57 | 154.17 | 164.60 | 81.96 | 88.81 |
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