Statistics of sunspot activity
March, 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 | 18.00 | 25.00 | 14.60 | 24.80 | 22.67 | 29.60 | 30.20 | 27.60 | 15.60 | 11.00 | 11.00 | 0.00 | 0.00 | 13.20 | 11.00 | 14.83 | 21.00 | 25.67 | 15.67 | 11.75 | 17.33 | 19.00 | 27.75 | 20.83 | 18.80 | 19.75 | 11.67 | 15.00 | 11.33 | 18.13 | 24.20 | 17.64 | 100 |
| Wn | 11.00 | 12.20 | 11.60 | 19.60 | 20.50 | 29.60 | 30.20 | 27.60 | 15.60 | 11.00 | 11.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 9.00 | 17.33 | 19.00 | 24.75 | 20.83 | 18.80 | 19.75 | 11.67 | 12.80 | 11.33 | 15.25 | 19.40 | 12.90 | 73.10 |
| Ws | 7.00 | 12.80 | 3.00 | 5.20 | 2.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 13.20 | 11.00 | 14.83 | 21.00 | 25.67 | 15.67 | 2.75 | 0.00 | 0.00 | 3.00 | 0.00 | 0.00 | 0.00 | 0.00 | 2.20 | 0.00 | 2.88 | 4.80 | 4.75 | 26.90 |
| n | 1.60 | 2.00 | 1.20 | 2.00 | 1.50 | 1.40 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.00 | 0.00 | 1.20 | 1.00 | 1.33 | 1.67 | 2.00 | 1.33 | 1.00 | 1.00 | 1.00 | 2.00 | 1.33 | 1.40 | 1.75 | 1.00 | 1.20 | 1.00 | 1.25 | 1.60 | 1.25 | 100 |
| A | 0.20 | 0.00 | 0.00 | 0.00 | 0.33 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.00 | 0.33 | 0.17 | 0.00 | 1.00 | 0.25 | 0.00 | 0.00 | 1.00 | 0.33 | 0.00 | 0.50 | 0.00 | 0.20 | 0.00 | 0.25 | 0.20 | 0.18 | 14.36 |
| B | 0.20 | 0.80 | 0.40 | 1.40 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.83 | 0.00 | 0.75 | 1.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.13 | 0.40 | 0.24 | 19.33 |
| C | 0.00 | 1.00 | 0.20 | 0.00 | 0.17 | 0.40 | 0.20 | 0.60 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.33 | 0.33 | 0.00 | 0.00 | 1.00 | 0.75 | 0.50 | 0.60 | 0.00 | 0.50 | 0.40 | 0.00 | 0.75 | 1.00 | 0.32 | 25.97 |
| D | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.60 | 0.80 | 0.40 | 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 | 0.33 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.09 | 7.18 |
| 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| H | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.17 | 0.40 | 0.00 | 0.13 | 0.00 | 0.05 | 3.72 |
| I | 1.20 | 0.20 | 0.60 | 0.60 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 1.00 | 0.00 | 0.00 | 0.80 | 1.00 | 1.00 | 0.67 | 0.83 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.50 | 0.33 | 0.20 | 1.00 | 0.00 | 0.00 | 0.37 | 29.45 |
| x | 0.40 | 0.80 | 0.40 | 1.40 | 1.00 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.00 | 0.33 | 0.67 | 0.83 | 1.00 | 1.00 | 1.00 | 0.00 | 1.00 | 0.50 | 0.00 | 0.75 | 0.00 | 0.20 | 0.00 | 0.38 | 0.60 | 0.42 | 33.68 |
| r | 0.20 | 0.20 | 0.20 | 0.00 | 0.33 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.00 | 0.17 | 0.50 | 0.67 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.11 | 8.77 |
| s | 0.80 | 1.00 | 0.60 | 0.60 | 0.17 | 0.20 | 0.40 | 0.20 | 0.80 | 0.50 | 1.00 | 0.00 | 0.00 | 0.60 | 0.75 | 0.83 | 0.50 | 0.33 | 0.00 | 0.00 | 0.00 | 1.00 | 1.00 | 0.67 | 0.80 | 0.50 | 0.50 | 0.40 | 1.00 | 0.63 | 1.00 | 0.54 | 43.27 |
| a | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.60 | 0.60 | 0.60 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.20 | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.00 | 0.10 | 8.34 |
| h | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.33 | 0.20 | 0.00 | 0.25 | 0.00 | 0.05 | 3.96 |
| k | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 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 | 0.00 | 0.17 | 0.20 | 0.00 | 0.00 | 0.00 | 0.02 | 1.98 |
| x | 1.40 | 0.20 | 0.60 | 0.60 | 0.67 | 0.40 | 0.00 | 0.00 | 0.00 | 1.00 | 1.00 | 0.00 | 0.00 | 1.20 | 1.00 | 1.33 | 0.83 | 0.83 | 1.00 | 0.25 | 0.00 | 0.00 | 1.00 | 0.33 | 0.40 | 1.50 | 0.50 | 0.80 | 1.00 | 0.38 | 0.20 | 0.59 | 47.53 |
| o | 0.20 | 1.80 | 0.60 | 1.40 | 0.50 | 0.60 | 0.60 | 0.40 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.83 | 1.17 | 0.33 | 0.75 | 1.00 | 1.00 | 1.00 | 0.50 | 0.60 | 0.25 | 0.50 | 0.20 | 0.00 | 0.88 | 1.20 | 0.56 | 44.65 |
| i | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.40 | 0.40 | 0.60 | 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 | 0.40 | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.20 | 0.10 | 7.82 |
| 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| CV | 10.80 | 13.40 | 7.80 | 8.80 | 5.17 | 15.80 | 20.00 | 20.60 | 16.40 | 16.75 | 10.00 | 0.00 | 0.00 | 7.20 | 9.25 | 9.33 | 8.50 | 9.17 | 2.67 | 1.75 | 2.00 | 11.00 | 15.50 | 14.83 | 16.00 | 26.00 | 25.00 | 21.60 | 10.00 | 17.50 | 12.20 | 11.77 | 100 |
| CVn | 9.40 | 10.80 | 7.40 | 8.00 | 4.33 | 15.80 | 20.00 | 20.60 | 16.40 | 16.75 | 10.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.50 | 2.00 | 11.00 | 15.25 | 14.83 | 16.00 | 26.00 | 25.00 | 21.40 | 10.00 | 17.13 | 11.40 | 10.03 | 85.20 |
| CVs | 1.40 | 2.60 | 0.40 | 0.80 | 0.83 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 7.20 | 9.25 | 9.33 | 8.50 | 9.17 | 2.67 | 0.25 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.00 | 0.38 | 0.80 | 1.74 | 14.80 |
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