Statistics of sunspot activity
Solar activity in 1997
Visual indices of solar activity by National Geophysical Data Center
| | Average by |
monthIIIIII
IVVVI
VIIVIIIIX
XXIXIIdays| months | | | | | | | | | | | | | | |
| W | 10.14 | 0.00 | 12.36 | 22.51 | 26.70 | 20.74 | 16.36 | 32.47 | 55.46 | 31.04 | 48.33 | 52.29 | 27.49 | 27.37 |
| Wn | 3.11 | 0.00 | 4.92 | 5.55 | 20.95 | 13.83 | 11.33 | 23.79 | 27.23 | 22.95 | 31.31 | 33.99 | 16.68 | 16.58 |
| Ws | 7.03 | 0.00 | 7.44 | 16.96 | 5.75 | 6.91 | 5.03 | 8.68 | 28.23 | 8.09 | 17.02 | 18.30 | 10.81 | 10.79 |
| n | 0.81 | 0.00 | 0.80 | 1.41 | 1.90 | 1.42 | 1.23 | 2.13 | 2.82 | 2.08 | 2.41 | 3.12 | 1.69 | 1.68 |
| A | 0.39 | 0.00 | 0.17 | 0.28 | 0.51 | 0.49 | 0.51 | 0.47 | 0.42 | 0.30 | 0.56 | 0.50 | 0.39 | 0.38 |
| B | 0.32 | 0.00 | 0.25 | 0.28 | 0.43 | 0.37 | 0.50 | 0.35 | 0.20 | 0.54 | 0.23 | 0.49 | 0.33 | 0.33 |
| C | 0.06 | 0.00 | 0.24 | 0.44 | 0.36 | 0.19 | 0.05 | 0.37 | 0.43 | 0.62 | 0.49 | 0.60 | 0.33 | 0.32 |
| D | 0.04 | 0.00 | 0.04 | 0.26 | 0.15 | 0.29 | 0.16 | 0.28 | 0.69 | 0.26 | 0.23 | 0.43 | 0.24 | 0.24 |
| E | 0.00 | 0.00 | 0.00 | 0.03 | 0.01 | 0.00 | 0.00 | 0.09 | 0.16 | 0.01 | 0.32 | 0.27 | 0.07 | 0.07 |
| F | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.24 | 0.00 | 0.14 | 0.05 | 0.04 | 0.04 |
| G | 0.00 | 0.00 | 0.05 | 0.05 | 0.02 | 0.02 | 0.00 | 0.00 | 0.35 | 0.03 | 0.28 | 0.20 | 0.08 | 0.08 |
| H | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.02 | 0.04 | 0.00 | 0.00 | 0.12 | 0.02 | 0.02 |
| I | 0.00 | 0.00 | 0.06 | 0.07 | 0.40 | 0.06 | 0.01 | 0.56 | 0.28 | 0.31 | 0.15 | 0.46 | 0.19 | 0.20 |
| x | 0.71 | 0.00 | 0.42 | 0.56 | 0.95 | 0.86 | 1.00 | 0.82 | 0.62 | 0.84 | 0.79 | 0.99 | 0.72 | 0.71 |
| r | 0.06 | 0.00 | 0.09 | 0.14 | 0.15 | 0.22 | 0.11 | 0.16 | 0.13 | 0.22 | 0.28 | 0.19 | 0.15 | 0.15 |
| s | 0.04 | 0.00 | 0.13 | 0.28 | 0.61 | 0.18 | 0.05 | 0.87 | 0.82 | 0.68 | 0.38 | 1.01 | 0.42 | 0.42 |
| a | 0.00 | 0.00 | 0.17 | 0.40 | 0.18 | 0.15 | 0.06 | 0.26 | 0.66 | 0.29 | 0.48 | 0.49 | 0.26 | 0.26 |
| h | 0.00 | 0.00 | 0.00 | 0.01 | 0.01 | 0.00 | 0.00 | 0.02 | 0.13 | 0.00 | 0.06 | 0.25 | 0.04 | 0.04 |
| k | 0.00 | 0.00 | 0.00 | 0.01 | 0.01 | 0.00 | 0.00 | 0.00 | 0.46 | 0.05 | 0.42 | 0.19 | 0.10 | 0.10 |
| x | 0.39 | 0.00 | 0.24 | 0.35 | 0.92 | 0.55 | 0.51 | 1.04 | 0.74 | 0.62 | 0.71 | 1.08 | 0.60 | 0.60 |
| o | 0.42 | 0.00 | 0.56 | 1.00 | 0.91 | 0.84 | 0.71 | 0.95 | 1.50 | 1.42 | 1.23 | 1.71 | 0.94 | 0.94 |
| i | 0.00 | 0.00 | 0.01 | 0.06 | 0.07 | 0.03 | 0.00 | 0.12 | 0.49 | 0.05 | 0.30 | 0.17 | 0.11 | 0.11 |
| c | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.09 | 0.00 | 0.18 | 0.16 | 0.04 | 0.04 |
| CV | 2.19 | 0.00 | 4.82 | 12.56 | 13.19 | 9.19 | 4.82 | 19.04 | 56.16 | 17.60 | 41.33 | 47.49 | 19.07 | 19.03 |
| CVn | 0.84 | 0.00 | 2.06 | 2.32 | 11.39 | 3.52 | 4.13 | 14.45 | 19.62 | 12.08 | 24.73 | 32.06 | 10.67 | 10.60 |
| CVs | 1.36 | 0.00 | 2.76 | 10.25 | 1.79 | 5.68 | 0.69 | 4.59 | 36.54 | 5.52 | 16.61 | 15.44 | 8.40 | 8.43 |
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