Statistics of sunspot activity
August, 1997
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 | 11.00 | 21.00 | 12.00 | 21.00 | 44.75 | 54.33 | 57.50 | 56.75 | 30.50 | 43.75 | 65.25 | 65.75 | 52.50 | 52.50 | 25.50 | 22.50 | 13.75 | 11.00 | 11.00 | 11.00 | 11.00 | 11.50 | 0.00 | 21.00 | 27.75 | 33.25 | 31.20 | 50.00 | 64.00 | 73.50 | 32.47 | 100 |
| Wn | 0.00 | 11.00 | 5.50 | 0.00 | 5.33 | 20.50 | 23.67 | 24.50 | 35.00 | 13.50 | 27.50 | 42.75 | 45.50 | 35.50 | 46.50 | 25.50 | 22.50 | 11.00 | 11.00 | 11.00 | 11.00 | 11.00 | 11.50 | 0.00 | 15.00 | 19.25 | 33.25 | 31.20 | 50.00 | 64.00 | 73.50 | 23.79 | 73.27 |
| Ws | 0.00 | 0.00 | 15.50 | 12.00 | 15.67 | 24.25 | 30.67 | 33.00 | 21.75 | 17.00 | 16.25 | 22.50 | 20.25 | 17.00 | 6.00 | 0.00 | 0.00 | 2.75 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 6.00 | 8.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 8.68 | 26.73 |
| n | 0.00 | 1.00 | 1.50 | 1.00 | 1.67 | 3.00 | 3.00 | 3.50 | 3.75 | 2.00 | 3.00 | 4.75 | 4.50 | 4.25 | 4.25 | 2.25 | 2.00 | 1.25 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.00 | 1.50 | 1.75 | 2.00 | 1.40 | 1.67 | 2.67 | 3.50 | 2.13 | 100 |
| A | 0.00 | 1.00 | 0.50 | 0.00 | 0.33 | 0.00 | 0.33 | 1.00 | 1.00 | 0.25 | 0.00 | 0.75 | 0.00 | 0.25 | 1.00 | 0.25 | 1.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.00 | 0.25 | 0.75 | 1.00 | 0.80 | 0.67 | 0.33 | 1.75 | 0.47 | 21.87 |
| B | 0.00 | 0.00 | 0.75 | 0.25 | 0.33 | 1.00 | 0.00 | 0.00 | 1.25 | 0.75 | 0.75 | 1.50 | 0.50 | 0.50 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 0.00 | 0.00 | 0.00 | 0.00 | 1.33 | 0.25 | 0.35 | 16.50 |
| C | 0.00 | 0.00 | 0.25 | 0.25 | 1.00 | 0.25 | 0.67 | 0.50 | 1.25 | 0.75 | 1.25 | 0.25 | 1.75 | 0.25 | 1.25 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.50 | 0.00 | 0.00 | 0.33 | 0.25 | 0.37 | 17.38 |
| D | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 1.67 | 2.00 | 0.25 | 0.25 | 0.00 | 0.25 | 0.50 | 0.75 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.50 | 0.40 | 0.00 | 0.00 | 0.00 | 0.28 | 12.95 |
| 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 | 0.20 | 1.00 | 0.67 | 1.00 | 0.09 | 4.33 |
| 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 | 0.00 | 0.00 | 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 | 0.02 | 0.76 |
| I | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 0.75 | 0.33 | 0.00 | 0.00 | 0.00 | 1.00 | 1.50 | 1.75 | 2.50 | 1.00 | 1.50 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.56 | 26.20 |
| x | 0.00 | 1.00 | 1.25 | 0.25 | 0.67 | 1.00 | 0.33 | 1.00 | 2.25 | 1.00 | 0.75 | 2.25 | 0.50 | 0.75 | 2.00 | 0.25 | 1.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.00 | 1.00 | 0.75 | 1.00 | 0.80 | 0.67 | 1.67 | 2.00 | 0.82 | 38.37 |
| r | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 1.00 | 0.50 | 0.50 | 0.50 | 0.00 | 0.25 | 0.00 | 0.50 | 0.25 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.16 | 7.68 |
| s | 0.00 | 0.00 | 0.25 | 0.75 | 0.67 | 1.25 | 0.33 | 0.75 | 0.25 | 0.25 | 2.00 | 1.00 | 2.75 | 3.00 | 2.00 | 1.50 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.75 | 0.60 | 1.00 | 1.00 | 0.75 | 0.87 | 40.97 |
| a | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 1.33 | 1.25 | 0.75 | 0.25 | 0.25 | 0.75 | 1.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 0.25 | 0.00 | 0.00 | 0.00 | 0.50 | 0.26 | 12.22 |
| h | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.76 |
| 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| x | 0.00 | 1.00 | 0.50 | 0.50 | 0.33 | 0.75 | 0.67 | 1.00 | 1.00 | 0.25 | 1.00 | 2.75 | 1.75 | 2.75 | 2.00 | 1.75 | 2.00 | 1.25 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.00 | 0.50 | 0.75 | 1.00 | 0.80 | 0.67 | 0.33 | 2.00 | 1.04 | 48.83 |
| o | 0.00 | 0.00 | 1.00 | 0.50 | 1.33 | 2.25 | 2.33 | 2.25 | 2.75 | 1.75 | 2.00 | 2.00 | 2.75 | 1.50 | 2.25 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.25 | 1.00 | 0.00 | 0.00 | 1.67 | 0.50 | 0.95 | 44.72 |
| i | 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 | 0.00 | 0.00 | 0.75 | 0.00 | 0.40 | 1.00 | 0.67 | 0.50 | 0.12 | 5.39 |
| 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 | 0.20 | 0.00 | 0.00 | 0.50 | 0.02 | 1.06 |
| CV | 0.00 | 1.00 | 4.75 | 8.25 | 10.00 | 32.75 | 38.67 | 46.00 | 17.50 | 12.50 | 24.50 | 43.25 | 45.75 | 44.75 | 25.25 | 17.75 | 11.00 | 10.25 | 10.00 | 10.00 | 10.00 | 10.00 | 1.00 | 0.00 | 4.00 | 23.50 | 17.50 | 19.00 | 29.67 | 26.00 | 35.75 | 19.04 | 100 |
| CVn | 0.00 | 1.00 | 0.50 | 0.00 | 0.67 | 20.50 | 19.00 | 23.75 | 6.75 | 1.75 | 20.25 | 40.75 | 30.00 | 25.00 | 24.50 | 17.75 | 11.00 | 10.00 | 10.00 | 10.00 | 10.00 | 10.00 | 1.00 | 0.00 | 3.25 | 22.75 | 17.50 | 19.00 | 29.67 | 26.00 | 35.75 | 14.45 | 75.90 |
| CVs | 0.00 | 0.00 | 4.25 | 8.25 | 9.33 | 12.25 | 19.67 | 22.25 | 10.75 | 10.75 | 4.25 | 2.50 | 15.75 | 19.75 | 0.75 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 0.75 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 4.59 | 24.10 |
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