Statistics of sunspot activity
December, 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 | 63.00 | 47.00 | 46.25 | 48.00 | 42.00 | 42.67 | 57.00 | 81.00 | 86.25 | 71.33 | 79.67 | 66.00 | 62.67 | 52.67 | 48.00 | 43.67 | 41.67 | 27.33 | 18.00 | 32.50 | 33.33 | 37.00 | 56.50 | 66.67 | 56.33 | 44.00 | 51.33 | 51.00 | 57.25 | 55.75 | 55.00 | 52.28 | 100 |
| Wn | 59.75 | 47.00 | 40.00 | 36.33 | 34.67 | 42.67 | 53.33 | 57.33 | 51.25 | 43.00 | 58.67 | 55.00 | 48.00 | 41.33 | 36.75 | 32.67 | 30.67 | 27.33 | 14.33 | 16.00 | 12.00 | 11.00 | 23.00 | 34.00 | 22.33 | 12.00 | 21.00 | 26.25 | 28.75 | 18.50 | 18.75 | 33.99 | 65.01 |
| Ws | 3.25 | 0.00 | 6.25 | 11.67 | 7.33 | 0.00 | 3.67 | 23.67 | 35.00 | 28.33 | 21.00 | 11.00 | 14.67 | 11.33 | 11.25 | 11.00 | 11.00 | 0.00 | 3.67 | 16.50 | 21.33 | 26.00 | 33.50 | 32.67 | 34.00 | 32.00 | 30.33 | 24.75 | 28.50 | 37.25 | 36.25 | 18.30 | 34.99 |
| n | 1.25 | 1.00 | 1.50 | 2.00 | 2.67 | 3.00 | 4.00 | 6.00 | 5.50 | 5.00 | 5.33 | 4.50 | 4.33 | 4.00 | 3.25 | 3.00 | 3.00 | 1.33 | 1.33 | 2.50 | 2.33 | 2.00 | 3.00 | 4.00 | 3.00 | 2.50 | 2.67 | 3.00 | 3.50 | 3.00 | 3.25 | 3.12 | 100 |
| A | 0.25 | 0.00 | 0.00 | 0.67 | 1.00 | 0.33 | 0.67 | 1.00 | 0.25 | 0.00 | 0.67 | 1.00 | 1.33 | 0.67 | 0.25 | 0.33 | 0.33 | 0.00 | 0.67 | 1.00 | 0.00 | 0.00 | 1.00 | 1.33 | 0.67 | 0.50 | 0.33 | 0.50 | 0.50 | 0.00 | 0.25 | 0.50 | 16.02 |
| B | 0.00 | 0.00 | 0.50 | 0.33 | 0.67 | 1.33 | 1.33 | 3.00 | 1.75 | 1.00 | 0.67 | 0.00 | 0.00 | 0.33 | 0.25 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.50 | 0.67 | 0.33 | 0.00 | 0.33 | 0.50 | 1.00 | 0.00 | 0.00 | 0.49 | 15.68 |
| C | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 1.00 | 1.67 | 1.00 | 3.25 | 2.00 | 1.33 | 1.00 | 1.00 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.67 | 0.50 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.33 | 0.50 | 0.00 | 0.75 | 1.25 | 0.60 | 19.12 |
| D | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.67 | 1.33 | 1.50 | 1.00 | 0.67 | 0.75 | 1.00 | 1.00 | 1.00 | 0.00 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 1.25 | 1.50 | 0.43 | 13.87 |
| E | 0.00 | 0.33 | 0.50 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.67 | 0.75 | 1.00 | 1.00 | 0.50 | 1.00 | 0.75 | 0.50 | 0.00 | 0.00 | 0.27 | 8.61 |
| F | 0.75 | 0.33 | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.05 | 1.64 |
| G | 0.25 | 0.33 | 0.00 | 0.00 | 0.67 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.67 | 0.33 | 0.00 | 0.00 | 0.00 | 0.33 | 0.33 | 0.25 | 0.00 | 0.00 | 0.50 | 0.00 | 0.25 | 0.50 | 0.50 | 0.00 | 0.20 | 6.46 |
| 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 | 0.25 | 1.00 | 1.00 | 0.50 | 0.33 | 0.25 | 0.00 | 0.25 | 0.00 | 0.12 | 3.70 |
| I | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 1.00 | 0.00 | 1.33 | 1.33 | 1.00 | 1.00 | 1.67 | 1.00 | 0.67 | 1.33 | 0.33 | 0.00 | 0.50 | 0.33 | 1.00 | 0.25 | 0.00 | 0.00 | 0.25 | 0.33 | 0.25 | 0.00 | 0.25 | 0.25 | 0.47 | 14.90 |
| x | 0.25 | 0.00 | 0.50 | 1.00 | 1.67 | 1.67 | 2.00 | 4.00 | 2.00 | 1.00 | 1.33 | 1.00 | 1.33 | 1.00 | 0.50 | 0.67 | 0.33 | 0.00 | 0.67 | 1.00 | 0.33 | 0.00 | 1.50 | 2.00 | 1.00 | 0.50 | 0.67 | 1.00 | 1.50 | 0.00 | 0.25 | 0.99 | 31.70 |
| r | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.75 | 0.67 | 1.00 | 1.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.33 | 0.33 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.25 | 0.19 | 5.94 |
| s | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 1.00 | 1.33 | 1.75 | 2.33 | 2.67 | 2.00 | 1.67 | 1.33 | 1.50 | 2.33 | 2.00 | 1.33 | 0.67 | 1.50 | 1.00 | 0.67 | 0.00 | 0.00 | 0.33 | 1.25 | 1.33 | 0.25 | 0.50 | 0.75 | 1.50 | 1.01 | 32.39 |
| a | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.67 | 0.33 | 1.00 | 1.00 | 0.33 | 0.50 | 1.33 | 1.67 | 1.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.67 | 1.00 | 0.00 | 0.00 | 0.67 | 0.00 | 0.00 | 1.00 | 1.00 | 1.75 | 0.75 | 0.49 | 15.85 |
| h | 0.75 | 0.33 | 0.00 | 1.00 | 0.67 | 0.33 | 0.33 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 1.00 | 0.33 | 0.75 | 0.67 | 0.75 | 0.00 | 0.00 | 0.25 | 0.25 | 8.01 |
| k | 0.25 | 0.67 | 1.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 1.00 | 0.67 | 0.00 | 0.00 | 0.00 | 0.50 | 0.25 | 0.25 | 0.19 | 6.12 |
| x | 0.25 | 0.00 | 0.00 | 0.67 | 1.00 | 0.33 | 1.00 | 2.00 | 0.25 | 1.33 | 2.00 | 2.00 | 2.33 | 2.33 | 1.25 | 1.00 | 1.67 | 0.33 | 0.67 | 1.50 | 0.33 | 1.00 | 1.50 | 2.33 | 1.67 | 1.25 | 1.00 | 1.00 | 0.50 | 0.50 | 0.50 | 1.08 | 34.63 |
| o | 0.25 | 0.33 | 0.50 | 0.33 | 1.67 | 2.67 | 3.00 | 4.00 | 5.25 | 3.67 | 3.33 | 2.50 | 2.00 | 1.67 | 2.00 | 1.67 | 1.33 | 1.00 | 0.67 | 1.00 | 1.67 | 0.33 | 0.75 | 0.67 | 0.33 | 0.75 | 0.67 | 1.25 | 2.50 | 2.50 | 2.75 | 1.71 | 54.78 |
| i | 0.50 | 0.33 | 0.75 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.33 | 0.00 | 0.33 | 1.00 | 0.25 | 0.00 | 0.25 | 0.25 | 0.00 | 0.00 | 0.17 | 5.51 |
| c | 0.25 | 0.33 | 0.25 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.75 | 0.67 | 0.00 | 0.25 | 1.00 | 0.50 | 0.25 | 0.00 | 0.00 | 0.16 | 5.08 |
| CV | 53.50 | 51.67 | 50.75 | 56.33 | 48.67 | 28.67 | 33.00 | 37.00 | 38.25 | 45.00 | 51.33 | 47.50 | 40.33 | 35.00 | 47.25 | 51.00 | 43.33 | 28.33 | 8.00 | 24.00 | 27.33 | 34.00 | 66.00 | 95.67 | 64.33 | 62.25 | 66.33 | 61.25 | 60.25 | 53.00 | 63.00 | 47.49 | 100 |
| CVn | 53.25 | 51.67 | 49.75 | 55.00 | 48.00 | 28.67 | 32.67 | 34.00 | 22.25 | 30.00 | 40.00 | 37.50 | 30.00 | 26.00 | 38.00 | 44.00 | 36.33 | 28.33 | 7.67 | 18.00 | 8.67 | 7.00 | 13.00 | 41.67 | 39.33 | 32.75 | 31.33 | 34.50 | 34.25 | 15.75 | 24.50 | 32.06 | 67.50 |
| CVs | 0.25 | 0.00 | 1.00 | 1.33 | 0.67 | 0.00 | 0.33 | 3.00 | 16.00 | 15.00 | 11.33 | 10.00 | 10.33 | 9.00 | 9.25 | 7.00 | 7.00 | 0.00 | 0.33 | 6.00 | 18.67 | 27.00 | 53.00 | 54.00 | 25.00 | 29.50 | 35.00 | 26.75 | 26.00 | 37.25 | 38.50 | 15.44 | 32.50 |
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