Statistics of sunspot activity
October, 1987
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 | 31 | Average | % |
| W | 39.29 | 29.83 | 43.33 | 64.86 | 52.43 | 46.14 | 35.57 | 55.86 | 46.50 | 64.50 | 66.50 | 57.17 | 99.00 | 99.00 | 99.67 | 98.25 | 89.00 | 84.86 | 93.40 | 82.00 | 62.00 | 52.80 | 28.60 | 21.67 | 26.50 | 46.71 | 76.00 | 82.50 | 78.33 | 80.33 | 71.00 | 63.66 | 100 |
| Wn | 20.00 | 27.83 | 41.50 | 55.57 | 50.14 | 42.71 | 35.57 | 43.86 | 27.83 | 30.50 | 34.83 | 27.50 | 36.00 | 40.20 | 49.83 | 48.75 | 39.83 | 31.29 | 31.00 | 24.00 | 15.60 | 4.40 | 2.20 | 13.50 | 18.50 | 30.86 | 46.50 | 45.00 | 38.83 | 40.67 | 41.83 | 33.44 | 52.53 |
| Ws | 19.29 | 2.00 | 1.83 | 9.29 | 2.29 | 3.43 | 0.00 | 12.00 | 18.67 | 34.00 | 31.67 | 29.67 | 63.00 | 58.80 | 49.83 | 49.50 | 49.17 | 53.57 | 62.40 | 58.00 | 46.40 | 48.40 | 26.40 | 8.17 | 8.00 | 15.86 | 29.50 | 37.50 | 39.50 | 39.67 | 29.17 | 30.22 | 47.47 |
| n | 2.57 | 1.83 | 2.17 | 2.57 | 2.14 | 2.29 | 2.14 | 4.14 | 3.67 | 4.50 | 4.00 | 3.33 | 5.25 | 4.40 | 4.00 | 4.00 | 4.17 | 4.71 | 5.60 | 5.40 | 4.40 | 3.40 | 1.80 | 1.67 | 1.67 | 3.14 | 4.17 | 3.17 | 3.00 | 3.00 | 2.83 | 3.39 | 100 |
| A | 0.43 | 0.33 | 0.33 | 0.71 | 0.00 | 0.29 | 0.14 | 0.43 | 0.83 | 1.00 | 0.17 | 0.67 | 1.00 | 0.40 | 0.00 | 0.00 | 0.83 | 0.71 | 1.00 | 0.40 | 0.20 | 0.40 | 0.20 | 0.33 | 0.00 | 1.57 | 0.83 | 0.00 | 0.17 | 0.00 | 0.00 | 0.43 | 12.73 |
| B | 1.14 | 0.50 | 0.83 | 0.86 | 0.29 | 0.57 | 0.71 | 2.71 | 0.83 | 1.00 | 0.17 | 0.67 | 1.25 | 0.60 | 0.00 | 0.00 | 0.00 | 0.86 | 0.80 | 1.80 | 0.20 | 0.60 | 1.40 | 0.67 | 0.67 | 0.57 | 2.00 | 0.50 | 0.50 | 0.33 | 0.67 | 0.76 | 22.54 |
| C | 0.71 | 0.17 | 0.00 | 0.00 | 0.86 | 0.71 | 1.29 | 0.86 | 1.00 | 0.67 | 0.83 | 0.67 | 1.00 | 1.60 | 0.17 | 0.25 | 0.17 | 0.00 | 1.40 | 1.80 | 2.80 | 0.80 | 0.00 | 0.17 | 0.00 | 0.14 | 0.50 | 0.67 | 0.33 | 1.33 | 1.00 | 0.71 | 20.82 |
| D | 0.14 | 0.00 | 0.17 | 0.00 | 0.14 | 0.43 | 0.00 | 0.00 | 0.50 | 0.33 | 0.33 | 0.00 | 0.50 | 0.60 | 2.17 | 1.50 | 1.50 | 1.86 | 0.80 | 0.60 | 0.20 | 0.80 | 0.00 | 0.33 | 0.50 | 0.29 | 0.17 | 1.17 | 1.00 | 0.50 | 0.17 | 0.54 | 15.88 |
| E | 0.14 | 0.67 | 0.83 | 0.86 | 0.57 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.67 | 0.00 | 0.50 | 0.40 | 0.67 | 0.25 | 0.50 | 0.14 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.83 | 0.33 | 0.33 | 0.33 | 0.29 | 8.62 |
| 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.01 | 0.16 |
| G | 0.00 | 0.17 | 0.00 | 0.14 | 0.29 | 0.14 | 0.00 | 0.00 | 0.00 | 0.17 | 0.17 | 0.33 | 0.00 | 0.00 | 0.17 | 1.00 | 0.17 | 0.14 | 0.40 | 0.00 | 0.20 | 0.00 | 0.00 | 0.00 | 0.50 | 0.57 | 0.17 | 0.00 | 0.67 | 0.50 | 0.33 | 0.20 | 5.92 |
| H | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.17 | 0.00 | 0.00 | 0.50 | 0.25 | 0.60 | 0.33 | 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 | 0.17 | 0.09 | 2.53 |
| I | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.00 | 0.00 | 0.33 | 1.00 | 1.67 | 0.50 | 0.75 | 0.20 | 0.50 | 0.50 | 1.00 | 1.00 | 1.00 | 0.80 | 0.80 | 0.80 | 0.20 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.37 | 10.81 |
| x | 1.57 | 0.83 | 1.17 | 1.57 | 0.29 | 0.86 | 0.86 | 3.14 | 1.67 | 2.00 | 0.33 | 1.33 | 2.25 | 1.00 | 0.00 | 0.00 | 0.83 | 1.57 | 1.80 | 2.20 | 0.40 | 1.00 | 1.60 | 1.00 | 0.67 | 2.14 | 2.83 | 0.50 | 0.67 | 0.33 | 0.67 | 1.20 | 35.27 |
| r | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.29 | 0.00 | 0.00 | 0.00 | 0.00 | 0.67 | 0.00 | 0.50 | 0.20 | 0.00 | 0.25 | 0.00 | 0.00 | 0.40 | 0.60 | 0.60 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.50 | 0.17 | 0.17 | 0.17 | 0.18 | 5.39 |
| s | 0.57 | 0.33 | 0.50 | 0.29 | 0.57 | 0.86 | 0.57 | 0.29 | 0.67 | 0.83 | 1.33 | 0.17 | 0.50 | 0.80 | 1.17 | 0.75 | 0.83 | 1.43 | 1.80 | 1.00 | 1.20 | 1.20 | 0.20 | 0.50 | 0.33 | 0.29 | 0.17 | 0.67 | 0.67 | 0.83 | 0.50 | 0.70 | 20.74 |
| a | 0.29 | 0.67 | 0.33 | 0.57 | 1.29 | 0.29 | 0.71 | 0.57 | 0.83 | 0.83 | 0.67 | 0.33 | 0.75 | 0.80 | 1.50 | 1.75 | 2.17 | 1.71 | 1.60 | 1.60 | 2.20 | 0.20 | 0.00 | 0.17 | 0.33 | 0.57 | 0.67 | 1.50 | 1.50 | 1.67 | 0.67 | 0.93 | 27.33 |
| h | 0.14 | 0.00 | 0.17 | 0.14 | 0.00 | 0.00 | 0.00 | 0.14 | 0.33 | 0.50 | 0.17 | 0.33 | 0.25 | 0.20 | 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 | 0.08 | 2.42 |
| k | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.33 | 0.83 | 1.17 | 1.00 | 1.40 | 1.33 | 1.25 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.14 | 0.33 | 0.00 | 0.00 | 0.00 | 0.67 | 0.30 | 8.84 |
| x | 0.43 | 0.33 | 0.33 | 0.71 | 0.00 | 0.43 | 0.14 | 0.57 | 1.33 | 2.00 | 1.83 | 1.67 | 2.00 | 1.20 | 0.83 | 1.00 | 1.83 | 1.71 | 2.00 | 1.20 | 1.00 | 1.20 | 0.40 | 0.50 | 0.00 | 1.57 | 0.83 | 0.00 | 0.17 | 0.00 | 0.17 | 0.88 | 26.07 |
| o | 1.57 | 0.83 | 0.83 | 0.86 | 1.29 | 1.57 | 2.00 | 3.57 | 2.17 | 2.17 | 1.00 | 1.17 | 2.50 | 2.00 | 2.33 | 2.00 | 0.83 | 1.57 | 2.60 | 4.20 | 3.20 | 2.20 | 1.40 | 1.17 | 1.67 | 1.57 | 2.67 | 2.17 | 2.33 | 2.17 | 2.17 | 1.93 | 56.85 |
| i | 0.57 | 0.67 | 1.00 | 1.00 | 0.86 | 0.29 | 0.00 | 0.00 | 0.17 | 0.33 | 1.17 | 0.50 | 0.75 | 1.20 | 0.67 | 1.00 | 1.50 | 1.43 | 1.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.67 | 1.00 | 0.50 | 0.83 | 0.50 | 0.57 | 16.92 |
| 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 | 0.17 | 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 | 0.00 | 0.00 | 0.00 | 0.01 | 0.16 |
| CV | 22.14 | 22.83 | 32.83 | 31.14 | 32.57 | 22.71 | 13.57 | 19.29 | 40.67 | 59.17 | 72.17 | 66.00 | 75.00 | 90.60 | 109.50 | 101.75 | 68.00 | 62.43 | 56.80 | 36.60 | 39.00 | 28.80 | 5.00 | 12.50 | 30.83 | 25.86 | 35.50 | 50.17 | 47.50 | 42.83 | 58.50 | 45.56 | 100 |
| CVn | 19.43 | 22.50 | 32.67 | 30.43 | 32.29 | 22.29 | 13.57 | 17.57 | 37.33 | 52.00 | 55.83 | 41.00 | 43.50 | 42.00 | 47.67 | 38.50 | 31.83 | 26.43 | 25.40 | 12.20 | 11.20 | 2.20 | 2.00 | 11.33 | 29.50 | 24.29 | 31.83 | 24.17 | 23.00 | 21.67 | 27.50 | 27.52 | 60.41 |
| CVs | 2.71 | 0.33 | 0.17 | 0.71 | 0.29 | 0.43 | 0.00 | 1.71 | 3.33 | 7.17 | 16.33 | 25.00 | 31.50 | 48.60 | 61.83 | 63.25 | 36.17 | 36.00 | 31.40 | 24.40 | 27.80 | 26.60 | 3.00 | 1.17 | 1.33 | 1.57 | 3.67 | 26.00 | 24.50 | 21.17 | 31.00 | 18.04 | 39.59 |
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