Statistics of sunspot activity
May, 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 | 41.20 | 43.00 | 40.80 | 25.75 | 24.00 | 27.57 | 34.86 | 26.00 | 27.17 | 31.86 | 29.17 | 28.29 | 21.80 | 20.60 | 39.60 | 54.71 | 66.50 | 57.14 | 62.50 | 52.50 | 37.17 | 42.00 | 39.14 | 37.00 | 39.71 | 33.43 | 34.00 | 21.50 | 15.50 | 15.40 | 12.67 | 34.92 | 100 |
| Wn | 15.40 | 17.33 | 16.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 7.71 | 9.60 | 2.20 | 14.00 | 22.57 | 24.17 | 29.86 | 36.33 | 36.50 | 32.67 | 42.00 | 39.14 | 37.00 | 39.71 | 33.43 | 34.00 | 21.50 | 15.50 | 15.40 | 12.67 | 17.90 | 51.26 |
| Ws | 25.80 | 25.67 | 24.60 | 25.75 | 24.00 | 27.57 | 34.86 | 26.00 | 27.17 | 31.86 | 29.17 | 20.57 | 12.20 | 18.40 | 25.60 | 32.14 | 42.33 | 27.29 | 26.17 | 16.00 | 4.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 17.02 | 48.74 |
| n | 3.00 | 3.33 | 3.40 | 2.25 | 2.00 | 2.00 | 2.00 | 1.43 | 1.33 | 1.71 | 1.67 | 2.14 | 1.80 | 1.80 | 3.00 | 3.43 | 4.00 | 3.00 | 2.83 | 2.00 | 1.17 | 1.00 | 1.00 | 1.00 | 1.71 | 2.00 | 2.00 | 1.17 | 1.00 | 1.00 | 1.00 | 2.01 | 100 |
| A | 0.00 | 0.33 | 0.80 | 0.50 | 0.00 | 0.14 | 0.00 | 0.29 | 0.33 | 0.43 | 0.50 | 0.43 | 0.20 | 0.00 | 0.00 | 0.14 | 0.17 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.57 | 0.43 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.18 | 8.73 |
| B | 1.20 | 1.17 | 1.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.29 | 0.17 | 0.71 | 0.40 | 0.40 | 0.00 | 0.29 | 0.17 | 0.29 | 0.83 | 0.67 | 0.33 | 0.00 | 0.14 | 0.00 | 0.14 | 0.57 | 0.33 | 0.17 | 0.00 | 0.00 | 0.00 | 0.31 | 15.54 |
| C | 0.80 | 0.83 | 0.00 | 0.00 | 0.17 | 0.00 | 0.14 | 0.00 | 0.17 | 0.14 | 0.50 | 0.71 | 0.40 | 0.20 | 1.00 | 1.29 | 0.17 | 0.29 | 0.50 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.83 | 0.83 | 0.80 | 0.33 | 0.34 | 16.79 |
| D | 0.00 | 0.17 | 0.20 | 0.50 | 1.00 | 0.86 | 0.43 | 0.43 | 0.17 | 0.29 | 0.17 | 0.00 | 0.20 | 0.00 | 0.80 | 0.00 | 0.83 | 0.57 | 0.00 | 0.17 | 0.00 | 0.17 | 0.29 | 0.00 | 0.00 | 0.00 | 0.67 | 0.17 | 0.17 | 0.00 | 0.00 | 0.27 | 13.23 |
| E | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.14 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.86 | 1.00 | 0.71 | 0.67 | 0.83 | 0.83 | 0.83 | 0.57 | 1.00 | 0.86 | 0.71 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.32 | 16.08 |
| 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 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.23 |
| G | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.29 | 0.43 | 0.67 | 0.57 | 0.17 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.29 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.29 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.11 | 5.32 |
| 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 | 0.20 | 0.00 | 0.00 | 0.33 | 0.29 | 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 | 0.03 | 1.32 |
| I | 1.00 | 0.83 | 1.00 | 1.25 | 0.83 | 0.86 | 1.00 | 0.14 | 0.00 | 0.00 | 0.00 | 0.14 | 0.60 | 1.00 | 1.20 | 0.86 | 1.33 | 0.57 | 0.50 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.67 | 0.46 | 22.76 |
| x | 1.20 | 1.50 | 2.20 | 0.50 | 0.00 | 0.14 | 0.00 | 0.29 | 0.33 | 0.71 | 0.67 | 1.14 | 0.60 | 0.40 | 0.00 | 0.43 | 0.33 | 0.29 | 1.00 | 0.67 | 0.33 | 0.00 | 0.14 | 0.00 | 0.71 | 1.00 | 0.33 | 0.17 | 0.00 | 0.00 | 0.00 | 0.49 | 24.27 |
| r | 0.60 | 0.67 | 0.20 | 0.00 | 0.00 | 0.00 | 0.14 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.20 | 0.20 | 0.29 | 0.67 | 0.29 | 0.50 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.15 | 7.38 |
| s | 1.20 | 1.17 | 1.00 | 1.50 | 1.50 | 1.43 | 0.86 | 0.71 | 0.83 | 1.00 | 0.83 | 1.00 | 1.00 | 0.80 | 1.60 | 1.14 | 1.00 | 0.57 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.29 | 0.67 | 0.83 | 0.83 | 0.80 | 0.67 | 0.75 | 37.37 |
| a | 0.00 | 0.00 | 0.00 | 0.25 | 0.33 | 0.14 | 0.57 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.20 | 0.40 | 0.71 | 0.67 | 0.57 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.17 | 0.20 | 0.33 | 0.17 | 8.39 |
| h | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.14 | 0.43 | 0.29 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.33 | 0.00 | 0.17 | 0.00 | 0.00 | 0.33 | 0.57 | 0.60 | 0.00 | 0.57 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.15 | 7.45 |
| k | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.80 | 0.86 | 1.00 | 1.29 | 0.83 | 1.00 | 0.83 | 0.67 | 0.29 | 0.40 | 1.00 | 0.14 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.30 | 15.14 |
| x | 1.00 | 1.17 | 1.80 | 1.75 | 0.83 | 1.00 | 1.00 | 0.43 | 0.33 | 0.43 | 0.50 | 0.57 | 0.80 | 1.20 | 1.20 | 1.00 | 1.83 | 0.86 | 0.67 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.57 | 0.43 | 0.00 | 0.00 | 0.00 | 0.20 | 0.67 | 0.66 | 32.81 |
| o | 2.00 | 2.17 | 1.60 | 0.50 | 1.17 | 0.86 | 0.86 | 0.86 | 1.00 | 1.14 | 0.83 | 1.43 | 1.00 | 0.60 | 1.20 | 1.57 | 1.17 | 1.29 | 1.33 | 1.00 | 0.33 | 0.00 | 0.14 | 0.00 | 0.14 | 0.86 | 1.33 | 1.17 | 1.00 | 0.80 | 0.33 | 0.96 | 47.73 |
| i | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.14 | 0.14 | 0.00 | 0.14 | 0.33 | 0.14 | 0.00 | 0.00 | 0.60 | 0.86 | 1.00 | 0.86 | 0.83 | 0.83 | 0.50 | 0.50 | 0.29 | 0.80 | 0.86 | 0.71 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 16.65 |
| 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 | 0.00 | 0.00 | 0.00 | 0.33 | 0.50 | 0.57 | 0.20 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.06 | 2.81 |
| CV | 17.60 | 20.33 | 16.20 | 24.00 | 37.67 | 39.86 | 42.00 | 33.71 | 27.67 | 25.00 | 18.83 | 15.00 | 14.00 | 19.20 | 57.40 | 60.71 | 87.33 | 75.43 | 52.67 | 49.17 | 42.83 | 52.83 | 48.00 | 52.40 | 49.29 | 46.14 | 61.00 | 13.17 | 12.83 | 10.20 | 9.33 | 36.51 | 100 |
| CVn | 4.40 | 3.33 | 2.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.29 | 3.60 | 8.00 | 36.60 | 42.29 | 48.00 | 46.14 | 46.17 | 46.33 | 42.17 | 52.83 | 48.00 | 52.40 | 49.29 | 46.14 | 61.00 | 13.17 | 12.83 | 10.20 | 9.33 | 22.11 | 60.57 |
| CVs | 13.20 | 17.00 | 14.20 | 24.00 | 37.67 | 39.86 | 42.00 | 33.71 | 27.67 | 25.00 | 18.83 | 13.71 | 10.40 | 11.20 | 20.80 | 18.43 | 39.33 | 29.29 | 6.50 | 2.83 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 14.40 | 39.43 |
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