Statistics of sunspot activity
August, 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 | 48.67 | 51.60 | 42.33 | 33.00 | 32.17 | 37.33 | 45.40 | 60.43 | 40.50 | 49.29 | 51.25 | 47.57 | 49.83 | 44.29 | 52.57 | 48.63 | 52.33 | 47.33 | 51.00 | 54.71 | 54.00 | 33.71 | 47.17 | 43.83 | 44.57 | 37.00 | 22.00 | 22.83 | 13.00 | 14.83 | 21.83 | 41.77 | 100 |
| Wn | 36.83 | 36.40 | 26.83 | 13.40 | 11.17 | 11.00 | 2.20 | 16.86 | 5.88 | 9.86 | 16.75 | 6.57 | 1.83 | 6.43 | 3.14 | 0.00 | 0.00 | 0.00 | 2.00 | 0.00 | 6.29 | 11.43 | 20.00 | 27.67 | 43.00 | 37.00 | 19.80 | 11.83 | 2.00 | 2.00 | 0.00 | 12.52 | 29.97 |
| Ws | 11.83 | 15.20 | 15.50 | 19.60 | 21.00 | 26.33 | 43.20 | 43.57 | 34.63 | 39.43 | 34.50 | 41.00 | 48.00 | 37.86 | 49.43 | 48.63 | 52.33 | 47.33 | 49.00 | 54.71 | 47.71 | 22.29 | 27.17 | 16.17 | 1.57 | 0.00 | 2.20 | 11.00 | 11.00 | 12.83 | 21.83 | 29.25 | 70.03 |
| n | 3.17 | 3.20 | 2.83 | 2.00 | 2.00 | 2.00 | 1.20 | 2.43 | 2.13 | 2.86 | 3.25 | 3.14 | 3.00 | 2.86 | 3.29 | 3.00 | 3.17 | 3.00 | 3.17 | 3.14 | 3.57 | 2.29 | 3.33 | 2.67 | 2.14 | 2.00 | 1.60 | 1.67 | 1.14 | 1.33 | 1.83 | 2.53 | 100 |
| A | 0.67 | 0.60 | 0.83 | 0.00 | 0.00 | 0.00 | 0.00 | 0.86 | 0.50 | 0.86 | 0.25 | 0.71 | 0.17 | 0.43 | 0.29 | 0.00 | 0.17 | 0.00 | 0.00 | 0.14 | 0.43 | 0.14 | 0.33 | 0.50 | 0.00 | 0.00 | 0.60 | 1.17 | 1.14 | 1.33 | 0.83 | 0.42 | 16.52 |
| B | 0.50 | 0.20 | 0.00 | 0.40 | 0.00 | 0.00 | 0.00 | 0.57 | 0.13 | 0.00 | 0.75 | 0.29 | 0.00 | 0.14 | 0.00 | 0.38 | 0.00 | 0.00 | 0.17 | 0.43 | 0.57 | 0.29 | 0.83 | 0.33 | 0.86 | 0.50 | 0.60 | 0.50 | 0.00 | 0.00 | 0.83 | 0.30 | 11.81 |
| C | 1.33 | 0.20 | 1.33 | 1.40 | 0.17 | 0.17 | 0.00 | 0.00 | 0.00 | 0.71 | 0.75 | 0.29 | 0.00 | 0.29 | 0.57 | 0.63 | 0.83 | 1.33 | 1.33 | 0.71 | 0.14 | 0.71 | 1.17 | 0.83 | 0.57 | 0.33 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.52 | 20.42 |
| D | 0.50 | 1.80 | 0.67 | 0.00 | 1.00 | 0.83 | 1.00 | 0.86 | 0.13 | 0.57 | 0.50 | 1.43 | 2.83 | 2.00 | 2.14 | 1.75 | 1.67 | 1.00 | 1.17 | 1.00 | 0.86 | 0.86 | 1.00 | 0.67 | 0.57 | 1.17 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.91 | 35.92 |
| E | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.63 | 0.43 | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.05 | 2.16 |
| 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 | 0.00 | 0.00 | 0.00 |
| G | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.13 | 0.29 | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.03 | 1.37 |
| H | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.17 | 0.00 | 0.00 | 0.38 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.33 | 0.14 | 0.14 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.06 | 2.22 |
| I | 0.00 | 0.40 | 0.00 | 0.20 | 0.67 | 0.83 | 0.20 | 0.00 | 0.25 | 0.00 | 0.00 | 0.43 | 0.00 | 0.00 | 0.29 | 0.00 | 0.50 | 0.67 | 0.17 | 0.71 | 1.43 | 0.29 | 0.00 | 0.17 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.24 | 9.57 |
| x | 1.17 | 0.80 | 0.83 | 0.40 | 0.00 | 0.00 | 0.00 | 1.43 | 0.63 | 0.86 | 1.00 | 1.00 | 0.17 | 0.57 | 0.29 | 0.38 | 0.17 | 0.00 | 0.17 | 0.57 | 1.00 | 0.43 | 1.17 | 0.83 | 0.86 | 0.50 | 1.20 | 1.67 | 1.14 | 1.33 | 1.67 | 0.72 | 28.33 |
| r | 0.00 | 0.80 | 0.50 | 0.60 | 0.50 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.29 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.33 | 0.29 | 0.14 | 0.29 | 0.50 | 0.83 | 0.29 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.21 | 8.21 |
| s | 2.00 | 1.40 | 1.00 | 1.00 | 1.33 | 1.00 | 0.60 | 0.00 | 0.25 | 0.43 | 0.25 | 0.86 | 1.17 | 1.14 | 1.43 | 0.75 | 1.17 | 1.17 | 1.00 | 1.14 | 1.29 | 0.71 | 1.00 | 0.50 | 0.57 | 0.33 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.76 | 30.21 |
| a | 0.00 | 0.20 | 0.50 | 0.00 | 0.00 | 0.67 | 0.60 | 0.29 | 0.13 | 0.71 | 0.50 | 0.71 | 0.17 | 0.29 | 0.71 | 0.88 | 0.67 | 0.83 | 0.33 | 0.14 | 0.00 | 0.00 | 0.00 | 0.17 | 0.43 | 0.67 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.32 | 12.48 |
| h | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.17 | 0.00 | 0.00 | 0.50 | 0.29 | 0.75 | 0.14 | 0.33 | 0.14 | 0.00 | 0.25 | 0.50 | 0.67 | 1.00 | 0.43 | 0.71 | 0.57 | 0.50 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.24 | 9.29 |
| k | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.71 | 0.63 | 0.57 | 0.50 | 0.14 | 1.17 | 0.71 | 0.86 | 0.75 | 0.67 | 0.17 | 0.33 | 0.57 | 0.43 | 0.29 | 0.17 | 0.17 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.29 | 11.47 |
| x | 0.67 | 1.00 | 0.83 | 0.20 | 0.83 | 1.00 | 0.20 | 0.86 | 1.13 | 0.86 | 0.25 | 1.14 | 0.17 | 0.43 | 0.57 | 0.25 | 0.67 | 0.67 | 0.50 | 1.00 | 2.00 | 0.43 | 0.33 | 0.83 | 0.14 | 0.00 | 0.60 | 1.17 | 1.14 | 1.33 | 1.00 | 0.72 | 28.31 |
| o | 2.00 | 2.20 | 2.00 | 1.60 | 0.83 | 0.50 | 0.00 | 0.71 | 0.38 | 1.43 | 2.00 | 1.57 | 2.33 | 2.43 | 2.43 | 2.00 | 2.17 | 2.33 | 2.50 | 1.71 | 0.86 | 1.57 | 2.67 | 1.17 | 1.43 | 1.83 | 1.00 | 0.50 | 0.00 | 0.00 | 0.83 | 1.45 | 57.38 |
| i | 0.50 | 0.00 | 0.00 | 0.20 | 0.33 | 0.50 | 1.00 | 0.86 | 0.63 | 0.57 | 0.75 | 0.43 | 0.50 | 0.00 | 0.14 | 0.63 | 0.33 | 0.00 | 0.17 | 0.43 | 0.57 | 0.14 | 0.00 | 0.67 | 0.57 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 12.86 |
| c | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.14 | 0.13 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.14 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.04 | 1.45 |
| CV | 34.33 | 43.80 | 25.17 | 14.80 | 35.17 | 33.67 | 26.40 | 40.86 | 56.63 | 58.29 | 77.00 | 45.71 | 100.50 | 68.43 | 76.71 | 73.38 | 80.00 | 64.83 | 81.67 | 64.00 | 69.00 | 51.71 | 54.83 | 32.83 | 21.14 | 30.33 | 8.40 | 2.17 | 1.14 | 1.33 | 3.17 | 44.43 | 100 |
| CVn | 32.83 | 29.40 | 15.50 | 10.80 | 15.17 | 15.00 | 2.00 | 2.00 | 0.63 | 0.86 | 3.00 | 0.57 | 0.17 | 0.71 | 0.29 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 4.86 | 7.57 | 14.50 | 11.50 | 19.71 | 30.33 | 8.20 | 1.17 | 0.14 | 0.17 | 0.00 | 7.34 | 16.51 |
| CVs | 1.50 | 14.40 | 9.67 | 4.00 | 20.00 | 18.67 | 24.40 | 38.86 | 56.00 | 57.43 | 74.00 | 45.14 | 100.33 | 67.71 | 76.43 | 73.38 | 80.00 | 64.83 | 81.33 | 64.00 | 64.14 | 44.14 | 40.33 | 21.33 | 1.43 | 0.00 | 0.20 | 1.00 | 1.00 | 1.17 | 3.17 | 37.10 | 83.49 |
|
