Statistics of sunspot activity
March, 1991
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 | 148.50 | 149.60 | 88.14 | 110.80 | 126.67 | 120.86 | 160.33 | 192.00 | 162.83 | 157.57 | 131.50 | 125.17 | 134.83 | 178.50 | 244.50 | 264.50 | 267.80 | 227.50 | 194.25 | 230.25 | 195.25 | 188.00 | 216.83 | 190.33 | 174.00 | 172.57 | 160.60 | 180.20 | 163.00 | 150.25 | 162.40 | 173.21 | 100 |
| Wn | 42.67 | 49.00 | 55.57 | 76.80 | 76.50 | 59.71 | 72.83 | 80.00 | 69.50 | 37.86 | 18.83 | 14.00 | 11.33 | 12.33 | 23.75 | 31.50 | 23.20 | 25.50 | 38.25 | 36.50 | 32.50 | 22.00 | 26.33 | 22.50 | 17.17 | 15.57 | 17.00 | 32.60 | 48.67 | 45.75 | 80.80 | 39.24 | 22.66 |
| Ws | 105.83 | 100.60 | 32.57 | 34.00 | 50.17 | 61.14 | 87.50 | 112.00 | 93.33 | 119.71 | 112.67 | 111.17 | 123.50 | 166.17 | 220.75 | 233.00 | 244.60 | 202.00 | 156.00 | 193.75 | 162.75 | 166.00 | 190.50 | 167.83 | 156.83 | 157.00 | 143.60 | 147.60 | 114.33 | 104.50 | 81.60 | 133.97 | 77.34 |
| n | 8.00 | 8.60 | 6.14 | 7.40 | 8.83 | 7.71 | 8.83 | 8.75 | 8.67 | 7.57 | 6.83 | 6.50 | 6.17 | 7.83 | 10.75 | 11.75 | 10.40 | 10.75 | 9.50 | 10.25 | 9.25 | 9.25 | 8.83 | 9.33 | 7.17 | 7.29 | 6.00 | 6.80 | 7.67 | 7.25 | 8.40 | 8.34 | 100 |
| A | 2.00 | 2.20 | 2.57 | 1.80 | 1.67 | 1.29 | 1.00 | 1.25 | 1.50 | 1.14 | 0.50 | 0.33 | 0.17 | 1.50 | 2.75 | 2.75 | 0.80 | 1.75 | 0.25 | 1.25 | 1.25 | 1.75 | 0.67 | 2.17 | 0.83 | 1.14 | 0.60 | 0.60 | 1.00 | 1.25 | 2.00 | 1.35 | 16.14 |
| B | 1.17 | 1.40 | 0.71 | 2.80 | 2.33 | 0.71 | 0.83 | 0.50 | 1.67 | 1.71 | 0.50 | 0.17 | 0.17 | 0.33 | 1.25 | 1.50 | 0.20 | 1.50 | 3.00 | 1.50 | 1.75 | 1.25 | 2.17 | 0.83 | 1.17 | 1.14 | 1.00 | 0.60 | 1.00 | 0.50 | 0.80 | 1.17 | 13.99 |
| C | 0.83 | 0.60 | 0.00 | 0.40 | 2.33 | 1.43 | 1.83 | 1.75 | 1.33 | 0.86 | 1.50 | 2.00 | 1.00 | 2.00 | 2.50 | 2.25 | 2.60 | 2.50 | 1.25 | 2.75 | 1.50 | 3.00 | 2.00 | 2.50 | 1.83 | 1.00 | 0.60 | 1.00 | 1.83 | 0.25 | 0.60 | 1.54 | 18.51 |
| D | 2.50 | 3.20 | 1.29 | 0.60 | 1.33 | 0.86 | 1.17 | 1.75 | 1.33 | 0.57 | 0.83 | 1.50 | 1.00 | 0.33 | 0.00 | 1.75 | 2.20 | 0.75 | 0.50 | 1.00 | 0.50 | 0.75 | 0.67 | 0.67 | 1.17 | 1.43 | 1.60 | 2.80 | 2.17 | 3.25 | 4.00 | 1.40 | 16.81 |
| E | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.71 | 0.17 | 0.00 | 0.00 | 0.43 | 0.67 | 0.00 | 0.50 | 0.83 | 0.50 | 0.00 | 0.40 | 0.50 | 0.25 | 0.25 | 0.00 | 0.25 | 0.00 | 0.00 | 0.50 | 0.57 | 0.00 | 0.00 | 0.00 | 0.75 | 0.80 | 0.27 | 3.19 |
| F | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.83 | 1.00 | 1.00 | 0.86 | 0.50 | 0.83 | 0.83 | 1.17 | 1.50 | 1.75 | 1.00 | 1.25 | 2.00 | 1.75 | 1.00 | 0.75 | 1.17 | 1.50 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.50 | 0.20 | 0.86 | 10.27 |
| G | 1.00 | 0.60 | 0.00 | 0.00 | 0.00 | 0.43 | 0.67 | 1.25 | 0.50 | 0.57 | 0.67 | 0.83 | 1.00 | 0.50 | 0.00 | 0.25 | 1.20 | 0.50 | 0.00 | 0.00 | 0.75 | 0.50 | 0.67 | 0.83 | 0.50 | 0.43 | 1.00 | 0.80 | 0.67 | 0.25 | 0.00 | 0.53 | 6.33 |
| H | 0.00 | 0.00 | 0.43 | 0.40 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.71 | 0.17 | 0.00 | 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 | 0.07 | 0.79 |
| I | 0.33 | 0.60 | 1.14 | 1.40 | 0.83 | 2.14 | 2.33 | 1.25 | 1.33 | 0.71 | 1.50 | 0.83 | 1.50 | 1.17 | 2.25 | 1.50 | 2.00 | 2.00 | 2.25 | 1.75 | 2.50 | 1.00 | 1.50 | 0.83 | 0.17 | 0.57 | 0.20 | 0.00 | 0.00 | 0.50 | 0.00 | 1.16 | 13.97 |
| x | 3.17 | 3.60 | 3.29 | 4.60 | 4.00 | 2.00 | 1.83 | 1.75 | 3.17 | 2.86 | 1.00 | 0.50 | 0.33 | 1.83 | 4.00 | 4.25 | 1.00 | 3.25 | 3.25 | 2.75 | 3.00 | 3.00 | 2.83 | 3.00 | 2.00 | 2.29 | 1.60 | 1.20 | 2.00 | 1.75 | 2.80 | 2.51 | 30.14 |
| r | 0.67 | 0.60 | 0.29 | 0.20 | 0.00 | 0.14 | 0.83 | 1.25 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.20 | 0.50 | 0.50 | 1.00 | 0.25 | 0.25 | 0.00 | 1.00 | 0.67 | 0.43 | 0.20 | 0.20 | 0.17 | 0.50 | 0.20 | 0.34 | 4.08 |
| s | 1.00 | 1.60 | 0.57 | 0.40 | 1.17 | 1.71 | 2.00 | 1.75 | 2.17 | 1.57 | 2.83 | 2.17 | 1.50 | 1.17 | 2.25 | 1.25 | 3.40 | 3.75 | 1.75 | 2.50 | 2.25 | 3.75 | 2.83 | 1.83 | 1.00 | 0.71 | 0.80 | 1.60 | 0.83 | 1.50 | 1.00 | 1.76 | 21.13 |
| a | 1.83 | 1.60 | 1.43 | 1.80 | 2.67 | 2.29 | 3.00 | 2.50 | 2.00 | 1.57 | 1.17 | 2.00 | 3.00 | 3.00 | 3.00 | 5.00 | 4.60 | 1.25 | 2.25 | 2.75 | 3.00 | 1.25 | 2.17 | 2.50 | 2.33 | 2.86 | 2.40 | 2.80 | 3.50 | 2.25 | 2.80 | 2.47 | 29.62 |
| h | 0.17 | 0.00 | 0.29 | 0.00 | 0.17 | 0.14 | 0.00 | 0.50 | 0.00 | 0.43 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.20 | 0.25 | 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 | 0.09 | 1.02 |
| k | 1.17 | 1.20 | 0.29 | 0.40 | 0.83 | 1.43 | 1.17 | 1.00 | 1.17 | 1.14 | 1.83 | 1.83 | 1.33 | 1.50 | 1.50 | 1.00 | 1.00 | 1.75 | 1.75 | 1.25 | 0.75 | 0.75 | 1.00 | 1.00 | 1.17 | 1.00 | 1.00 | 1.00 | 1.17 | 1.25 | 1.60 | 1.17 | 14.01 |
| x | 2.33 | 2.80 | 4.14 | 3.60 | 2.83 | 3.43 | 3.33 | 2.50 | 2.83 | 2.57 | 2.17 | 1.17 | 1.67 | 2.67 | 5.00 | 4.25 | 2.80 | 3.75 | 2.50 | 3.00 | 3.75 | 2.75 | 2.17 | 3.00 | 1.00 | 1.71 | 0.80 | 0.60 | 1.00 | 1.75 | 2.00 | 2.58 | 30.90 |
| o | 4.67 | 5.40 | 1.57 | 3.60 | 5.83 | 3.29 | 4.17 | 5.25 | 4.67 | 3.71 | 3.17 | 3.83 | 3.00 | 3.17 | 3.75 | 5.75 | 6.20 | 5.00 | 4.75 | 3.50 | 4.50 | 5.25 | 5.33 | 4.83 | 4.67 | 3.71 | 4.00 | 5.00 | 5.17 | 3.25 | 4.80 | 4.35 | 52.15 |
| i | 1.00 | 0.40 | 0.43 | 0.20 | 0.17 | 1.00 | 1.33 | 1.00 | 1.00 | 1.29 | 1.17 | 1.17 | 1.00 | 1.67 | 1.50 | 1.75 | 1.40 | 1.75 | 2.00 | 3.25 | 1.00 | 1.00 | 1.00 | 0.83 | 0.67 | 0.86 | 0.20 | 0.40 | 1.00 | 1.75 | 1.60 | 1.12 | 13.45 |
| c | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.33 | 0.33 | 0.50 | 0.33 | 0.50 | 0.00 | 0.00 | 0.25 | 0.25 | 0.50 | 0.00 | 0.25 | 0.33 | 0.67 | 0.83 | 1.00 | 1.00 | 0.80 | 0.50 | 0.50 | 0.00 | 0.29 | 3.50 |
| CV | 123.00 | 121.80 | 59.57 | 47.80 | 91.50 | 118.71 | 129.00 | 149.25 | 121.50 | 123.86 | 141.00 | 144.50 | 131.67 | 131.33 | 137.25 | 150.75 | 178.40 | 168.00 | 144.00 | 147.75 | 107.50 | 125.50 | 124.00 | 128.67 | 123.33 | 123.00 | 119.60 | 142.60 | 133.83 | 148.75 | 152.60 | 128.71 | 100 |
| CVn | 30.67 | 29.00 | 32.43 | 27.40 | 38.67 | 37.00 | 47.67 | 65.75 | 44.50 | 16.71 | 11.17 | 10.33 | 8.50 | 5.33 | 6.25 | 13.50 | 21.60 | 17.25 | 16.75 | 20.00 | 12.25 | 2.50 | 9.33 | 6.67 | 4.00 | 6.71 | 12.40 | 25.40 | 34.17 | 38.75 | 63.60 | 23.11 | 17.95 |
| CVs | 92.33 | 92.80 | 27.14 | 20.40 | 52.83 | 81.71 | 81.33 | 83.50 | 77.00 | 107.14 | 129.83 | 134.17 | 123.17 | 126.00 | 131.00 | 137.25 | 156.80 | 150.75 | 127.25 | 127.75 | 95.25 | 123.00 | 114.67 | 122.00 | 119.33 | 116.29 | 107.20 | 117.20 | 99.67 | 110.00 | 89.00 | 105.61 | 82.05 |
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