Statistics of sunspot activity
May, 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 | 114.29 | 108.00 | 128.60 | 142.00 | 144.33 | 127.29 | 126.33 | 126.25 | 184.17 | 166.86 | 198.50 | 199.43 | 152.00 | 160.33 | 162.50 | 164.40 | 175.00 | 176.29 | 160.67 | 168.80 | 127.40 | 150.14 | 221.00 | 142.20 | 164.57 | 232.80 | 187.50 | 154.20 | 139.67 | 92.67 | 69.50 | 153.80 | 100 |
| Wn | 30.86 | 33.71 | 29.80 | 38.83 | 39.17 | 46.00 | 56.83 | 66.75 | 106.00 | 94.14 | 113.33 | 122.14 | 93.14 | 84.17 | 78.50 | 83.40 | 72.50 | 64.43 | 48.17 | 56.20 | 41.40 | 57.14 | 113.50 | 91.40 | 103.43 | 134.00 | 103.83 | 102.60 | 92.33 | 62.17 | 45.00 | 74.35 | 48.34 |
| Ws | 83.43 | 74.29 | 98.80 | 103.17 | 105.17 | 81.29 | 69.50 | 59.50 | 78.17 | 72.71 | 85.17 | 77.29 | 58.86 | 76.17 | 84.00 | 81.00 | 102.50 | 111.86 | 112.50 | 112.60 | 86.00 | 93.00 | 107.50 | 50.80 | 61.14 | 98.80 | 83.67 | 51.60 | 47.33 | 30.50 | 24.50 | 79.44 | 51.66 |
| n | 6.43 | 5.43 | 7.60 | 7.17 | 7.00 | 6.29 | 6.50 | 7.00 | 9.17 | 8.14 | 9.67 | 8.71 | 7.71 | 9.67 | 10.83 | 10.60 | 11.33 | 11.43 | 10.00 | 10.40 | 7.80 | 8.57 | 13.00 | 6.60 | 7.86 | 12.20 | 9.00 | 7.40 | 6.33 | 5.17 | 3.75 | 8.35 | 100 |
| A | 0.29 | 0.14 | 0.60 | 0.83 | 0.67 | 0.14 | 0.33 | 0.50 | 0.67 | 0.57 | 1.17 | 0.43 | 1.00 | 1.00 | 1.83 | 1.80 | 2.67 | 2.14 | 0.50 | 2.40 | 1.80 | 1.00 | 1.75 | 0.40 | 0.71 | 0.40 | 0.83 | 0.80 | 0.50 | 0.50 | 0.00 | 0.92 | 10.97 |
| B | 1.00 | 0.29 | 0.60 | 0.50 | 1.50 | 0.43 | 0.00 | 1.13 | 1.83 | 1.14 | 2.17 | 1.29 | 0.71 | 1.50 | 2.50 | 2.00 | 1.00 | 1.86 | 4.50 | 2.80 | 3.00 | 2.29 | 5.50 | 1.80 | 1.43 | 4.80 | 3.67 | 1.80 | 0.33 | 0.33 | 0.00 | 1.73 | 20.75 |
| C | 1.57 | 1.71 | 1.40 | 1.50 | 0.50 | 0.57 | 0.83 | 1.00 | 1.33 | 1.14 | 1.83 | 2.71 | 2.57 | 3.67 | 2.33 | 3.00 | 3.33 | 2.57 | 2.00 | 1.80 | 1.60 | 2.29 | 1.75 | 1.40 | 2.86 | 1.80 | 1.83 | 0.80 | 1.67 | 1.67 | 2.50 | 1.86 | 22.24 |
| D | 0.43 | 0.00 | 0.20 | 0.67 | 1.50 | 1.71 | 1.50 | 1.63 | 2.33 | 3.14 | 2.33 | 2.29 | 1.57 | 1.17 | 1.50 | 1.40 | 1.33 | 0.57 | 0.17 | 1.40 | 0.40 | 1.86 | 0.25 | 0.80 | 1.00 | 2.00 | 1.00 | 2.20 | 2.00 | 0.67 | 0.00 | 1.26 | 15.08 |
| E | 0.43 | 0.14 | 0.20 | 0.33 | 0.00 | 0.57 | 0.67 | 0.88 | 0.83 | 1.00 | 0.83 | 0.43 | 0.43 | 0.33 | 0.67 | 0.20 | 0.33 | 0.43 | 0.33 | 0.20 | 0.00 | 0.00 | 1.00 | 0.20 | 0.71 | 1.20 | 1.00 | 0.80 | 0.83 | 1.17 | 0.75 | 0.55 | 6.53 |
| F | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 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 | 0.00 | 0.00 | 0.02 | 0.19 |
| G | 1.14 | 1.43 | 1.80 | 0.83 | 0.67 | 0.57 | 0.67 | 0.38 | 0.33 | 0.14 | 0.33 | 0.29 | 0.71 | 0.50 | 0.33 | 0.60 | 0.50 | 0.57 | 0.67 | 0.80 | 1.00 | 1.00 | 2.50 | 1.80 | 0.86 | 0.40 | 0.00 | 0.20 | 0.17 | 0.00 | 0.25 | 0.69 | 8.29 |
| H | 0.00 | 0.00 | 0.20 | 0.33 | 0.33 | 0.14 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.00 | 0.00 | 0.00 | 0.20 | 0.17 | 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 | 0.08 | 0.93 |
| I | 1.57 | 1.71 | 2.60 | 2.17 | 1.50 | 2.14 | 2.50 | 1.50 | 1.67 | 1.00 | 1.00 | 1.14 | 0.71 | 1.50 | 1.67 | 1.40 | 2.00 | 2.57 | 1.67 | 1.00 | 0.00 | 0.14 | 0.25 | 0.20 | 0.29 | 1.60 | 0.67 | 0.80 | 0.83 | 0.83 | 0.25 | 1.25 | 15.03 |
| x | 1.29 | 0.43 | 1.20 | 1.33 | 2.17 | 0.57 | 0.33 | 1.63 | 2.50 | 1.71 | 3.33 | 1.71 | 1.71 | 2.50 | 4.33 | 3.80 | 3.67 | 4.00 | 5.00 | 5.20 | 4.80 | 3.29 | 7.25 | 2.20 | 2.14 | 5.20 | 4.50 | 2.60 | 0.83 | 0.83 | 0.00 | 2.65 | 31.72 |
| r | 0.29 | 0.00 | 0.20 | 0.33 | 0.17 | 0.00 | 0.00 | 0.25 | 0.50 | 0.86 | 0.67 | 0.00 | 0.14 | 0.33 | 0.17 | 1.00 | 1.17 | 1.43 | 0.83 | 1.00 | 0.20 | 1.14 | 1.25 | 0.80 | 0.57 | 0.40 | 0.67 | 0.20 | 0.33 | 1.17 | 0.50 | 0.53 | 6.40 |
| s | 2.29 | 1.43 | 2.80 | 1.00 | 1.17 | 2.00 | 2.00 | 1.00 | 1.50 | 1.14 | 1.17 | 1.71 | 2.00 | 2.83 | 2.00 | 1.80 | 1.83 | 2.43 | 2.50 | 2.60 | 1.00 | 1.00 | 0.50 | 1.00 | 2.29 | 2.60 | 1.33 | 1.60 | 1.33 | 1.17 | 1.25 | 1.69 | 20.20 |
| a | 1.71 | 3.14 | 3.20 | 4.00 | 1.67 | 1.57 | 1.67 | 1.88 | 2.00 | 1.00 | 1.33 | 2.71 | 1.00 | 1.83 | 2.33 | 2.00 | 2.67 | 2.43 | 1.17 | 1.60 | 1.80 | 2.71 | 3.50 | 1.80 | 1.86 | 2.80 | 1.50 | 2.00 | 2.83 | 1.00 | 1.00 | 2.06 | 24.62 |
| h | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.25 | 0.00 | 0.57 | 1.00 | 0.86 | 0.29 | 0.00 | 0.17 | 0.20 | 0.17 | 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 | 0.25 | 0.14 | 1.67 |
| k | 0.86 | 0.43 | 0.20 | 0.50 | 1.50 | 2.14 | 2.50 | 2.00 | 2.67 | 2.86 | 2.17 | 1.71 | 2.57 | 2.17 | 1.83 | 1.80 | 1.83 | 1.14 | 0.50 | 0.00 | 0.00 | 0.43 | 0.25 | 0.80 | 1.00 | 1.20 | 1.00 | 1.00 | 1.00 | 1.00 | 0.75 | 1.28 | 15.39 |
| x | 1.86 | 1.86 | 3.40 | 3.33 | 2.50 | 2.43 | 2.83 | 2.00 | 2.33 | 1.57 | 2.17 | 1.71 | 1.71 | 2.50 | 3.50 | 3.40 | 4.83 | 5.43 | 2.33 | 3.40 | 1.80 | 1.14 | 2.00 | 0.60 | 1.00 | 2.00 | 1.50 | 1.60 | 1.33 | 1.33 | 0.25 | 2.25 | 26.92 |
| o | 4.00 | 3.00 | 4.00 | 3.00 | 3.67 | 2.86 | 2.17 | 3.13 | 4.50 | 4.00 | 4.50 | 4.43 | 4.29 | 5.67 | 6.17 | 6.00 | 5.00 | 4.71 | 7.33 | 6.00 | 6.00 | 7.14 | 9.75 | 5.60 | 5.14 | 8.60 | 6.17 | 4.60 | 3.67 | 2.67 | 2.50 | 4.85 | 58.07 |
| i | 0.57 | 0.57 | 0.20 | 0.83 | 0.83 | 0.43 | 0.83 | 0.63 | 0.67 | 0.71 | 1.33 | 1.57 | 0.71 | 0.50 | 0.50 | 0.40 | 0.67 | 0.86 | 0.33 | 1.00 | 0.00 | 0.29 | 1.25 | 0.20 | 1.29 | 1.00 | 1.00 | 1.20 | 1.33 | 1.00 | 1.00 | 0.76 | 9.16 |
| c | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.57 | 0.67 | 1.25 | 1.67 | 1.86 | 1.67 | 1.00 | 1.00 | 1.00 | 0.67 | 0.80 | 0.83 | 0.43 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 0.43 | 0.60 | 0.33 | 0.00 | 0.00 | 0.17 | 0.00 | 0.49 | 5.85 |
| CV | 93.86 | 73.29 | 91.40 | 84.83 | 123.50 | 145.29 | 158.17 | 152.50 | 189.83 | 211.71 | 204.00 | 185.00 | 175.71 | 158.83 | 152.67 | 151.60 | 156.83 | 123.43 | 84.00 | 87.20 | 52.40 | 91.14 | 119.75 | 96.00 | 117.57 | 152.40 | 99.33 | 111.20 | 109.17 | 84.33 | 72.00 | 126.10 | 100 |
| CVn | 40.29 | 23.71 | 22.00 | 17.33 | 60.83 | 81.29 | 91.50 | 90.50 | 114.50 | 133.43 | 127.50 | 137.86 | 129.71 | 100.00 | 87.33 | 97.80 | 93.17 | 63.43 | 26.00 | 29.80 | 17.20 | 38.00 | 70.50 | 60.60 | 75.71 | 106.00 | 72.67 | 84.60 | 86.17 | 67.33 | 56.75 | 74.31 | 58.93 |
| CVs | 53.57 | 49.57 | 69.40 | 67.50 | 62.67 | 64.00 | 66.67 | 62.00 | 75.33 | 78.29 | 76.50 | 47.14 | 46.00 | 58.83 | 65.33 | 53.80 | 63.67 | 60.00 | 58.00 | 57.40 | 35.20 | 53.14 | 49.25 | 35.40 | 41.86 | 46.40 | 26.67 | 26.60 | 23.00 | 17.00 | 15.25 | 51.79 | 41.07 |
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