Statistics of sunspot activity
May, 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 | 0.00 | 13.00 | 11.50 | 11.00 | 11.00 | 11.00 | 18.67 | 12.50 | 21.00 | 24.75 | 12.00 | 14.75 | 16.75 | 17.75 | 26.00 | 31.67 | 32.50 | 42.50 | 54.75 | 76.25 | 52.60 | 55.50 | 43.00 | 59.00 | 51.33 | 43.00 | 16.25 | 19.67 | 28.00 | 0.00 | 26.70 | 100 |
| Wn | 0.00 | 0.00 | 0.00 | 0.00 | 11.00 | 11.00 | 11.00 | 18.67 | 12.50 | 21.00 | 24.75 | 12.00 | 14.75 | 16.75 | 15.00 | 26.00 | 31.67 | 32.50 | 39.75 | 43.25 | 65.00 | 42.80 | 35.75 | 20.00 | 34.00 | 38.33 | 29.25 | 13.50 | 16.00 | 13.33 | 0.00 | 20.95 | 78.48 |
| Ws | 0.00 | 0.00 | 13.00 | 11.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 2.75 | 0.00 | 0.00 | 0.00 | 2.75 | 11.50 | 11.25 | 9.80 | 19.75 | 23.00 | 25.00 | 13.00 | 13.75 | 2.75 | 3.67 | 14.67 | 0.00 | 5.75 | 21.52 |
| n | 0.00 | 0.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.67 | 1.00 | 1.75 | 2.00 | 1.00 | 1.00 | 1.00 | 1.25 | 2.00 | 2.67 | 2.00 | 2.25 | 3.00 | 3.75 | 3.20 | 3.75 | 3.25 | 5.00 | 4.33 | 3.25 | 1.25 | 1.33 | 2.33 | 0.00 | 1.90 | 100 |
| A | 0.00 | 0.00 | 0.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.50 | 0.50 | 0.00 | 0.00 | 0.00 | 0.25 | 0.75 | 1.00 | 1.00 | 0.25 | 0.50 | 0.50 | 0.40 | 0.75 | 0.50 | 3.00 | 1.67 | 1.00 | 0.25 | 0.33 | 1.33 | 0.00 | 0.51 | 26.79 |
| B | 0.00 | 0.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.25 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 1.67 | 0.00 | 1.00 | 0.25 | 0.50 | 0.40 | 1.00 | 0.75 | 1.00 | 1.33 | 2.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.43 | 22.84 |
| C | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.25 | 0.25 | 0.00 | 0.50 | 0.75 | 1.00 | 0.50 | 0.00 | 0.75 | 0.25 | 1.00 | 1.00 | 1.00 | 0.00 | 0.75 | 0.50 | 0.33 | 0.25 | 0.00 | 0.67 | 1.00 | 0.00 | 0.36 | 19.06 |
| 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 | 0.50 | 0.25 | 0.00 | 0.00 | 0.00 | 0.25 | 0.75 | 0.75 | 0.75 | 0.40 | 0.50 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.15 | 8.02 |
| 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 | 0.20 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.76 |
| 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 | 0.25 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.85 |
| H | 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 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.76 |
| I | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.75 | 1.00 | 1.00 | 0.50 | 0.75 | 1.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.75 | 0.60 | 1.00 | 1.00 | 0.50 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 20.92 |
| x | 0.00 | 0.00 | 1.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.67 | 0.00 | 0.75 | 0.75 | 0.00 | 0.00 | 0.00 | 0.25 | 1.50 | 2.67 | 1.00 | 1.25 | 0.75 | 1.00 | 0.80 | 1.75 | 1.25 | 4.00 | 3.00 | 3.00 | 1.25 | 0.33 | 1.33 | 0.00 | 0.95 | 49.63 |
| r | 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 | 0.00 | 0.25 | 0.00 | 0.25 | 0.00 | 0.50 | 0.00 | 0.60 | 0.00 | 0.00 | 0.00 | 0.67 | 0.25 | 0.00 | 1.00 | 1.00 | 0.00 | 0.15 | 8.07 |
| s | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 0.50 | 1.00 | 1.00 | 1.00 | 0.75 | 1.00 | 1.00 | 1.00 | 0.75 | 0.25 | 0.25 | 0.00 | 0.50 | 0.75 | 0.75 | 1.50 | 1.00 | 1.50 | 2.00 | 1.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.61 | 31.90 |
| a | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.25 | 0.75 | 0.00 | 0.00 | 0.25 | 0.25 | 1.00 | 1.25 | 0.40 | 0.50 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.18 | 9.29 |
| 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 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.68 |
| k | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.42 |
| x | 0.00 | 0.00 | 0.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.33 | 0.50 | 1.25 | 1.50 | 1.00 | 0.00 | 0.00 | 0.25 | 0.75 | 1.00 | 1.00 | 0.25 | 1.00 | 1.25 | 1.20 | 1.75 | 1.50 | 3.50 | 2.67 | 1.00 | 0.25 | 0.33 | 1.33 | 0.00 | 0.92 | 48.48 |
| o | 0.00 | 0.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.50 | 0.50 | 0.50 | 0.00 | 1.00 | 1.00 | 1.00 | 1.25 | 1.67 | 0.75 | 2.00 | 1.50 | 1.75 | 1.60 | 1.75 | 1.75 | 1.50 | 1.67 | 2.25 | 1.00 | 1.00 | 1.00 | 0.00 | 0.91 | 47.88 |
| 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 | 0.25 | 0.00 | 0.50 | 0.75 | 0.40 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.07 | 3.64 |
| 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 | 0.00 | 0.00 | 2.00 | 1.00 | 10.00 | 16.00 | 10.00 | 11.00 | 10.50 | 10.50 | 12.25 | 10.00 | 18.00 | 13.75 | 9.00 | 6.25 | 4.33 | 14.00 | 22.25 | 28.50 | 42.25 | 42.60 | 36.75 | 26.50 | 15.50 | 13.00 | 6.25 | 2.25 | 8.00 | 6.33 | 0.00 | 13.19 | 100 |
| CVn | 0.00 | 0.00 | 0.00 | 0.00 | 10.00 | 16.00 | 10.00 | 11.00 | 10.50 | 10.50 | 12.25 | 10.00 | 18.00 | 13.75 | 8.75 | 6.25 | 4.33 | 14.00 | 22.00 | 23.00 | 35.25 | 31.40 | 28.00 | 15.00 | 13.00 | 11.00 | 4.50 | 2.00 | 7.67 | 5.00 | 0.00 | 11.39 | 86.39 |
| CVs | 0.00 | 0.00 | 2.00 | 1.00 | 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 | 0.25 | 5.50 | 7.00 | 11.20 | 8.75 | 11.50 | 2.50 | 2.00 | 1.75 | 0.25 | 0.33 | 1.33 | 0.00 | 1.79 | 13.61 |
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