Statistics of sunspot activity
July, 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 12.00 | 14.00 | 14.14 | 12.25 | 0.00 | 0.00 | 0.00 | 0.00 | 18.00 | 24.25 | 12.86 | 20.43 | 23.33 | 34.83 | 75.33 | 104.83 | 114.86 | 106.71 | 97.29 | 89.50 | 84.57 | 70.00 | 64.33 | 66.43 | 68.57 | 36.40 | 100 |
| Wn | 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 | 18.00 | 12.25 | 0.00 | 0.00 | 0.00 | 4.17 | 17.17 | 13.67 | 18.29 | 17.29 | 18.00 | 20.13 | 25.57 | 26.00 | 38.17 | 36.57 | 40.71 | 9.87 | 27.11 |
| Ws | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 12.00 | 14.00 | 14.14 | 12.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 12.00 | 12.86 | 20.43 | 23.33 | 30.67 | 58.17 | 91.17 | 96.57 | 89.43 | 79.29 | 69.38 | 59.00 | 44.00 | 26.17 | 29.86 | 27.86 | 26.53 | 72.89 |
| n | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.25 | 2.00 | 1.00 | 1.57 | 1.67 | 2.50 | 4.33 | 5.83 | 6.43 | 5.14 | 5.00 | 4.63 | 4.43 | 3.67 | 3.67 | 4.14 | 4.57 | 2.12 | 100 |
| A | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 0.00 | 0.43 | 0.00 | 0.00 | 0.17 | 1.00 | 1.14 | 0.14 | 0.14 | 0.38 | 0.14 | 0.67 | 0.17 | 0.00 | 0.57 | 0.20 | 9.41 |
| B | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 0.86 | 0.86 | 0.75 | 0.00 | 0.00 | 0.00 | 0.00 | 1.25 | 0.75 | 0.00 | 0.14 | 0.83 | 1.00 | 1.17 | 1.50 | 1.14 | 0.14 | 0.43 | 0.63 | 0.57 | 0.17 | 1.00 | 2.29 | 2.14 | 0.59 | 27.90 |
| C | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.14 | 0.33 | 0.17 | 1.00 | 1.50 | 1.43 | 0.86 | 0.43 | 0.13 | 1.00 | 0.83 | 1.83 | 1.43 | 1.71 | 0.43 | 20.25 |
| D | 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 | 0.71 | 0.57 | 0.00 | 0.00 | 1.17 | 1.33 | 1.57 | 1.71 | 1.14 | 0.88 | 1.00 | 0.33 | 0.00 | 0.29 | 0.00 | 0.35 | 16.27 |
| 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 | 0.00 | 0.43 | 0.71 | 0.63 | 0.14 | 0.17 | 0.00 | 0.00 | 0.00 | 0.07 | 3.16 |
| 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 | 0.00 | 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 | 0.00 | 0.57 | 0.86 | 1.14 | 1.13 | 0.71 | 0.67 | 0.50 | 0.14 | 0.14 | 0.19 | 9.16 |
| 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 | 0.00 | 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 | 0.00 | 0.00 | 0.22 |
| I | 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 | 0.29 | 0.29 | 0.50 | 1.33 | 0.67 | 0.50 | 0.43 | 1.00 | 1.00 | 0.88 | 0.86 | 0.83 | 0.17 | 0.00 | 0.00 | 0.29 | 13.64 |
| x | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.86 | 0.86 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.25 | 1.50 | 0.00 | 0.57 | 0.83 | 1.00 | 1.33 | 2.50 | 2.29 | 0.29 | 0.57 | 1.00 | 0.71 | 0.83 | 1.17 | 2.29 | 2.71 | 0.79 | 37.31 |
| r | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.50 | 0.50 | 0.43 | 0.14 | 0.29 | 0.00 | 0.00 | 0.50 | 0.83 | 0.71 | 0.29 | 0.15 | 6.84 |
| s | 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 | 0.29 | 0.33 | 0.50 | 1.00 | 1.67 | 2.43 | 2.86 | 1.57 | 1.88 | 2.29 | 1.33 | 1.17 | 1.00 | 1.14 | 0.64 | 30.19 |
| a | 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 | 0.50 | 0.43 | 0.71 | 0.50 | 0.83 | 1.33 | 1.17 | 1.14 | 1.71 | 2.29 | 1.25 | 1.43 | 1.00 | 0.50 | 0.14 | 0.43 | 0.50 | 23.56 |
| 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 | 0.14 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.14 | 0.14 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.03 | 1.28 |
| k | 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 | 0.29 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.81 |
| x | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.29 | 0.71 | 0.50 | 1.33 | 0.83 | 1.50 | 1.71 | 1.14 | 1.14 | 1.25 | 1.00 | 1.50 | 0.33 | 0.00 | 0.57 | 0.49 | 23.28 |
| o | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 1.00 | 1.00 | 0.75 | 0.00 | 0.00 | 0.00 | 0.00 | 1.25 | 1.00 | 0.71 | 0.86 | 1.17 | 1.17 | 3.33 | 3.83 | 3.43 | 2.71 | 2.29 | 2.25 | 2.71 | 1.67 | 3.33 | 3.86 | 3.86 | 1.38 | 65.21 |
| i | 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 | 0.50 | 1.29 | 1.29 | 1.57 | 1.13 | 0.71 | 0.50 | 0.00 | 0.29 | 0.14 | 0.24 | 11.26 |
| 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 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.25 |
| CV | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.75 | 2.43 | 2.86 | 1.75 | 0.00 | 0.00 | 0.00 | 0.00 | 2.50 | 6.00 | 22.00 | 15.57 | 8.83 | 13.67 | 50.33 | 52.17 | 78.14 | 94.00 | 88.00 | 85.88 | 62.86 | 42.33 | 30.50 | 25.86 | 24.57 | 22.97 | 100 |
| CVn | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 2.50 | 1.50 | 0.00 | 0.00 | 0.00 | 0.67 | 5.00 | 2.33 | 20.14 | 28.43 | 27.71 | 30.38 | 23.86 | 23.67 | 20.00 | 17.57 | 20.86 | 7.25 | 31.55 |
| CVs | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.75 | 2.43 | 2.86 | 1.75 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 4.50 | 22.00 | 15.57 | 8.83 | 13.00 | 45.33 | 49.83 | 58.00 | 65.57 | 60.29 | 55.50 | 39.00 | 18.67 | 10.50 | 8.29 | 3.71 | 15.72 | 68.45 |
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