Statistics of sunspot activity
Solar activity in 1991
Visual indices of solar activity by author's observations
| | Average by |
monthIIIIII
IVVVI
VIIVIIIIX
XXIXIIdays| months | | | | | | | | | | | | | | |
| N | | | 1 | 11 | 18 | 9 | 17 | 12 | 5 | 5 | 2 | 1 | 8.10 | 8.10 |
| W | | | 246.00 | 180.73 | 183.06 | 240.33 | 321.12 | 388.17 | 204.20 | 313.60 | 175.00 | 155.00 | 258.06 | 240.72 |
| Wn | | | 28.00 | 83.18 | 82.94 | 139.22 | 159.18 | 139.08 | 67.00 | 95.20 | 37.00 | 0.00 | 110.48 | 83.08 |
| Ws | | | 218.00 | 97.55 | 100.11 | 101.11 | 161.94 | 249.08 | 137.20 | 218.40 | 138.00 | 155.00 | 147.58 | 157.64 |
| n | | | 10.00 | 8.09 | 8.33 | 9.67 | 10.88 | 12.00 | 6.80 | 7.80 | 9.00 | 5.00 | 9.40 | 8.76 |
| A | | | 2.00 | 1.91 | 1.22 | 0.78 | 0.76 | 1.00 | 0.40 | 1.00 | 0.00 | 0.00 | 1.04 | 0.91 |
| B | | | 0.00 | 2.00 | 2.11 | 1.33 | 1.06 | 1.50 | 1.00 | 0.40 | 3.00 | 0.00 | 1.49 | 1.24 |
| C | | | 2.00 | 0.55 | 1.28 | 1.89 | 1.47 | 3.33 | 1.00 | 1.20 | 2.00 | 1.00 | 1.59 | 1.57 |
| D | | | 1.00 | 1.09 | 1.06 | 2.22 | 2.82 | 1.67 | 2.00 | 1.40 | 0.50 | 2.00 | 1.73 | 1.58 |
| E | | | 0.00 | 0.91 | 0.72 | 0.56 | 1.18 | 0.67 | 0.40 | 1.00 | 0.50 | 0.00 | 0.79 | 0.59 |
| F | | | 2.00 | 0.09 | 0.11 | 0.33 | 0.41 | 0.92 | 0.60 | 1.20 | 0.00 | 1.00 | 0.44 | 0.67 |
| G | | | 0.00 | 0.36 | 0.17 | 0.11 | 0.41 | 0.17 | 0.20 | 1.00 | 0.50 | 0.00 | 0.30 | 0.29 |
| H | | | 2.00 | 0.55 | 1.33 | 1.56 | 1.65 | 1.67 | 1.20 | 0.00 | 2.00 | 1.00 | 1.30 | 1.30 |
| I | | | 1.00 | 0.64 | 0.33 | 0.89 | 1.12 | 1.08 | 0.00 | 0.60 | 0.50 | 0.00 | 0.72 | 0.62 |
| x | | | 2.00 | 3.91 | 3.33 | 2.11 | 1.82 | 2.50 | 1.40 | 1.40 | 3.00 | 0.00 | 2.53 | 2.15 |
| r | | | 1.00 | 0.36 | 0.28 | 0.56 | 0.76 | 0.17 | 0.80 | 0.20 | 1.00 | 0.00 | 0.46 | 0.51 |
| s | | | 3.00 | 2.09 | 2.61 | 4.22 | 3.41 | 3.42 | 2.00 | 2.20 | 3.00 | 1.00 | 2.94 | 2.69 |
| a | | | 3.00 | 0.82 | 0.78 | 1.22 | 2.82 | 4.00 | 1.60 | 1.60 | 1.50 | 2.00 | 1.90 | 1.93 |
| h | | | 0.00 | 0.09 | 0.11 | 0.22 | 0.29 | 0.25 | 0.20 | 0.20 | 0.50 | 0.00 | 0.20 | 0.19 |
| k | | | 1.00 | 0.82 | 1.22 | 1.33 | 1.76 | 1.67 | 0.80 | 2.20 | 0.00 | 2.00 | 1.37 | 1.28 |
| x | | | 5.00 | 3.09 | 2.89 | 3.22 | 3.53 | 3.75 | 1.60 | 1.60 | 2.50 | 1.00 | 3.05 | 2.82 |
| o | | | 3.00 | 3.09 | 3.44 | 3.89 | 3.47 | 5.00 | 2.40 | 3.00 | 4.50 | 1.00 | 3.58 | 3.28 |
| i | | | 1.00 | 1.45 | 1.11 | 1.89 | 3.06 | 2.25 | 2.20 | 2.20 | 1.50 | 1.00 | 1.96 | 1.77 |
| c | | | 1.00 | 0.45 | 0.89 | 0.67 | 0.82 | 1.00 | 0.60 | 1.00 | 0.50 | 2.00 | 0.80 | 0.89 |
| CV | | | 145.00 | 105.27 | 123.78 | 164.78 | 209.59 | 197.75 | 123.40 | 194.00 | 96.00 | 150.00 | 159.00 | 150.96 |
| CVn | | | 12.00 | 57.27 | 57.94 | 94.67 | 109.47 | 80.42 | 46.40 | 70.00 | 28.00 | 0.00 | 74.09 | 55.62 |
| CVs | | | 133.00 | 48.00 | 65.83 | 70.11 | 100.12 | 117.33 | 77.00 | 124.00 | 68.00 | 150.00 | 84.91 | 95.34
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