Statistics of sunspot activity
April, 1984
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 | 144.00 | 110.33 | 108.75 | 98.60 | 72.33 | 88.00 | 56.20 | 39.50 | 19.00 | 16.50 | 24.00 | 32.86 | 30.60 | 46.71 | 74.67 | 80.86 | 76.67 | 105.40 | 102.75 | 104.00 | 101.00 | 60.50 | 62.40 | 86.17 | 114.33 | 120.20 | 125.83 | 142.00 | 138.25 | 130.00 | 83.75 | 100 |
| Wn | 28.17 | 17.17 | 20.25 | 15.40 | 16.00 | 21.50 | 18.40 | 8.75 | 13.50 | 5.50 | 13.00 | 28.14 | 30.60 | 35.71 | 40.33 | 44.86 | 38.33 | 57.60 | 45.75 | 41.33 | 40.00 | 10.00 | 0.00 | 0.00 | 6.00 | 9.80 | 1.83 | 1.83 | 0.00 | 0.00 | 20.33 | 24.27 |
| Ws | 115.83 | 93.17 | 88.50 | 83.20 | 56.33 | 66.50 | 37.80 | 30.75 | 5.50 | 11.00 | 11.00 | 4.71 | 0.00 | 11.00 | 34.33 | 36.00 | 38.33 | 47.80 | 57.00 | 62.67 | 61.00 | 50.50 | 62.40 | 86.17 | 108.33 | 110.40 | 124.00 | 140.17 | 138.25 | 130.00 | 63.42 | 75.73 |
| n | 5.67 | 5.17 | 4.75 | 5.00 | 4.67 | 5.50 | 4.00 | 3.25 | 1.50 | 1.50 | 2.00 | 1.43 | 1.00 | 1.86 | 2.83 | 3.14 | 3.00 | 5.20 | 5.00 | 5.00 | 5.33 | 3.50 | 3.00 | 3.17 | 3.67 | 3.60 | 3.17 | 3.17 | 3.00 | 2.00 | 3.50 | 100 |
| A | 0.50 | 0.00 | 0.00 | 1.40 | 1.67 | 1.67 | 0.60 | 0.75 | 0.00 | 1.50 | 1.00 | 0.43 | 0.00 | 0.14 | 0.17 | 0.86 | 0.33 | 0.60 | 0.50 | 0.67 | 0.33 | 0.00 | 0.60 | 0.00 | 0.83 | 0.80 | 0.17 | 0.17 | 0.00 | 0.00 | 0.52 | 14.92 |
| B | 0.17 | 0.00 | 0.75 | 0.40 | 0.50 | 1.33 | 1.60 | 1.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.43 | 0.50 | 0.00 | 0.00 | 1.00 | 0.25 | 0.33 | 0.33 | 0.75 | 0.40 | 1.00 | 0.67 | 0.20 | 0.50 | 0.00 | 0.25 | 0.00 | 0.43 | 12.24 |
| C | 2.00 | 2.67 | 1.75 | 1.40 | 1.00 | 1.00 | 0.80 | 0.00 | 1.00 | 0.00 | 1.00 | 0.00 | 0.00 | 0.14 | 0.33 | 0.43 | 0.33 | 0.20 | 1.00 | 1.00 | 1.67 | 1.00 | 0.80 | 1.17 | 1.00 | 1.40 | 1.33 | 0.83 | 0.50 | 0.00 | 0.86 | 24.51 |
| D | 2.00 | 1.50 | 0.75 | 0.80 | 0.50 | 0.33 | 0.60 | 0.00 | 0.00 | 0.00 | 0.00 | 0.86 | 0.20 | 0.14 | 0.83 | 1.14 | 1.17 | 1.80 | 2.00 | 1.67 | 2.67 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 1.17 | 1.00 | 0.00 | 0.73 | 20.74 |
| E | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.29 | 0.83 | 0.57 | 0.17 | 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 | 0.09 | 2.47 |
| F | 1.00 | 0.83 | 0.25 | 0.60 | 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 | 0.25 | 0.60 | 0.83 | 0.83 | 1.00 | 1.00 | 0.83 | 1.00 | 1.00 | 0.35 | 10.03 |
| G | 0.00 | 0.17 | 0.75 | 0.40 | 0.33 | 0.83 | 0.40 | 0.25 | 0.00 | 0.00 | 0.00 | 0.14 | 0.40 | 0.71 | 0.17 | 0.14 | 0.33 | 0.60 | 0.50 | 1.00 | 0.33 | 0.75 | 0.40 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.33 | 9.31 |
| 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 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.02 | 0.48 |
| I | 0.00 | 0.00 | 0.50 | 0.00 | 0.00 | 0.17 | 0.00 | 0.75 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 1.00 | 0.75 | 0.33 | 0.00 | 0.25 | 0.20 | 0.00 | 0.17 | 0.20 | 0.00 | 0.00 | 0.25 | 0.00 | 0.19 | 5.30 |
| x | 0.67 | 0.00 | 0.75 | 1.80 | 2.17 | 3.00 | 2.20 | 2.25 | 0.00 | 1.50 | 1.00 | 0.43 | 0.00 | 0.57 | 0.67 | 0.86 | 0.33 | 1.60 | 0.75 | 1.00 | 0.67 | 0.75 | 1.00 | 1.00 | 1.50 | 1.00 | 0.67 | 0.17 | 0.25 | 0.00 | 0.95 | 27.17 |
| r | 0.17 | 0.67 | 0.25 | 0.40 | 0.17 | 0.17 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.17 | 0.00 | 0.17 | 0.00 | 0.50 | 0.00 | 0.33 | 0.00 | 0.00 | 0.17 | 0.17 | 0.60 | 0.17 | 0.00 | 0.50 | 0.00 | 0.17 | 4.88 |
| s | 2.50 | 2.67 | 1.50 | 1.20 | 1.33 | 0.83 | 0.00 | 0.50 | 0.50 | 0.00 | 1.00 | 0.14 | 0.00 | 0.14 | 0.67 | 0.29 | 0.50 | 1.40 | 1.50 | 2.00 | 1.67 | 0.50 | 0.40 | 0.83 | 0.83 | 0.80 | 0.83 | 0.33 | 0.25 | 0.00 | 0.84 | 23.91 |
| a | 1.33 | 0.83 | 1.25 | 0.60 | 0.00 | 0.50 | 0.60 | 0.25 | 1.00 | 0.00 | 0.00 | 0.43 | 0.00 | 0.00 | 0.33 | 1.00 | 0.83 | 1.20 | 1.25 | 1.00 | 1.33 | 0.50 | 0.60 | 0.17 | 0.17 | 0.20 | 0.50 | 1.50 | 0.00 | 0.00 | 0.58 | 16.54 |
| h | 0.67 | 0.17 | 0.00 | 0.20 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.60 | 0.71 | 0.00 | 0.14 | 0.17 | 0.20 | 0.25 | 0.00 | 0.67 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.18 | 5.00 |
| k | 0.33 | 0.83 | 1.00 | 0.80 | 0.67 | 1.00 | 0.80 | 0.25 | 0.00 | 0.00 | 0.00 | 0.29 | 0.40 | 0.29 | 1.00 | 0.86 | 1.00 | 0.80 | 0.75 | 1.00 | 0.67 | 0.75 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.17 | 2.00 | 2.00 | 0.79 | 22.51 |
| x | 0.50 | 0.00 | 0.50 | 1.40 | 1.67 | 1.83 | 0.60 | 1.50 | 0.50 | 1.50 | 1.00 | 0.43 | 0.00 | 0.14 | 0.17 | 0.86 | 1.00 | 1.60 | 1.25 | 1.00 | 0.33 | 0.25 | 0.80 | 0.17 | 1.00 | 1.00 | 0.17 | 0.33 | 0.25 | 0.00 | 0.72 | 20.70 |
| o | 4.17 | 4.33 | 3.75 | 3.00 | 2.33 | 3.33 | 3.40 | 1.75 | 1.00 | 0.00 | 1.00 | 0.86 | 0.60 | 1.43 | 1.67 | 1.14 | 1.00 | 2.60 | 2.75 | 3.33 | 4.67 | 3.00 | 1.60 | 2.17 | 1.83 | 1.60 | 2.00 | 1.83 | 1.25 | 1.00 | 2.15 | 61.29 |
| i | 1.00 | 0.83 | 0.50 | 0.60 | 0.67 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.40 | 0.29 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.67 | 0.33 | 0.25 | 0.40 | 0.67 | 0.83 | 0.60 | 1.00 | 1.00 | 1.50 | 1.00 | 0.60 | 17.14 |
| 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 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.17 | 0.00 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.03 | 0.87 |
| CV | 116.83 | 106.83 | 83.75 | 80.20 | 74.00 | 67.83 | 47.80 | 21.50 | 13.00 | 1.50 | 12.00 | 32.00 | 48.60 | 54.43 | 69.33 | 70.43 | 73.33 | 91.00 | 94.25 | 96.67 | 115.00 | 92.50 | 59.00 | 61.00 | 60.83 | 66.00 | 65.50 | 80.67 | 98.00 | 92.00 | 68.19 | 100 |
| CVn | 14.00 | 10.50 | 13.25 | 12.00 | 9.67 | 10.67 | 4.20 | 1.25 | 9.50 | 0.50 | 11.00 | 31.57 | 48.60 | 49.14 | 46.50 | 48.29 | 46.33 | 61.60 | 63.50 | 65.33 | 76.33 | 16.75 | 0.00 | 0.00 | 0.83 | 1.60 | 0.17 | 0.17 | 0.00 | 0.00 | 21.78 | 31.93 |
| CVs | 102.83 | 96.33 | 70.50 | 68.20 | 64.33 | 57.17 | 43.60 | 20.25 | 3.50 | 1.00 | 1.00 | 0.43 | 0.00 | 5.29 | 22.83 | 22.14 | 27.00 | 29.40 | 30.75 | 31.33 | 38.67 | 75.75 | 59.00 | 61.00 | 60.00 | 64.40 | 65.33 | 80.50 | 98.00 | 92.00 | 46.42 | 68.07 |
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