Statistics of sunspot activity
July, 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 | 237.67 | 251.83 | 293.67 | 290.25 | 254.00 | 241.57 | 288.25 | 223.67 | 221.33 | 204.83 | 167.00 | 170.00 | 181.71 | 155.50 | 139.00 | 124.40 | 103.57 | 102.00 | 137.57 | 128.00 | 211.67 | 230.00 | 286.00 | 254.57 | 302.86 | 231.50 | 255.17 | 240.00 | 237.50 | 213.00 | 227.14 | 213.07 | 100 |
| Wn | 140.67 | 177.83 | 205.67 | 208.75 | 194.00 | 177.14 | 181.75 | 131.67 | 116.83 | 111.67 | 68.50 | 48.40 | 60.29 | 40.83 | 26.57 | 15.40 | 11.43 | 9.57 | 25.29 | 28.00 | 74.67 | 95.80 | 134.80 | 109.71 | 146.14 | 132.00 | 153.67 | 148.50 | 143.25 | 133.33 | 138.00 | 109.36 | 51.32 |
| Ws | 97.00 | 74.00 | 88.00 | 81.50 | 60.00 | 64.43 | 106.50 | 92.00 | 104.50 | 93.17 | 98.50 | 121.60 | 121.43 | 114.67 | 112.43 | 109.00 | 92.14 | 92.43 | 112.29 | 100.00 | 137.00 | 134.20 | 151.20 | 144.86 | 156.71 | 99.50 | 101.50 | 91.50 | 94.25 | 79.67 | 89.14 | 103.71 | 48.68 |
| n | 12.50 | 12.83 | 15.33 | 16.25 | 14.25 | 13.14 | 15.25 | 14.00 | 14.33 | 12.00 | 10.00 | 7.20 | 7.71 | 7.00 | 6.57 | 6.00 | 5.14 | 6.14 | 9.29 | 8.25 | 12.50 | 12.60 | 13.40 | 13.43 | 16.14 | 11.50 | 13.17 | 13.83 | 14.00 | 11.50 | 11.00 | 11.49 | 100 |
| A | 1.83 | 0.67 | 0.33 | 0.38 | 0.50 | 0.57 | 1.00 | 2.17 | 3.33 | 2.33 | 2.75 | 2.20 | 2.14 | 0.50 | 0.57 | 0.40 | 0.29 | 0.43 | 0.86 | 1.00 | 1.00 | 1.40 | 1.20 | 2.43 | 3.71 | 1.67 | 1.67 | 2.67 | 3.00 | 1.17 | 0.86 | 1.45 | 12.64 |
| B | 1.83 | 1.33 | 2.17 | 1.63 | 0.50 | 0.86 | 1.50 | 2.17 | 1.00 | 1.67 | 0.50 | 0.00 | 0.57 | 0.33 | 0.00 | 0.00 | 0.00 | 0.43 | 0.71 | 1.25 | 2.50 | 2.00 | 1.60 | 1.71 | 3.43 | 2.67 | 2.83 | 3.00 | 1.50 | 0.83 | 1.29 | 1.35 | 11.73 |
| C | 2.33 | 3.50 | 2.50 | 3.88 | 5.00 | 5.00 | 7.25 | 4.33 | 4.67 | 2.50 | 1.50 | 0.20 | 0.57 | 1.50 | 1.86 | 0.20 | 0.29 | 2.00 | 2.29 | 1.75 | 2.33 | 3.00 | 3.60 | 2.43 | 2.29 | 2.83 | 3.50 | 3.17 | 2.50 | 1.83 | 1.57 | 2.65 | 23.06 |
| D | 2.83 | 4.00 | 4.67 | 4.75 | 3.75 | 2.43 | 1.50 | 1.00 | 1.17 | 1.17 | 2.00 | 3.00 | 2.43 | 1.50 | 1.86 | 3.20 | 2.57 | 1.57 | 2.00 | 2.25 | 2.67 | 3.00 | 3.40 | 3.57 | 2.14 | 3.00 | 3.50 | 3.50 | 4.75 | 5.00 | 4.43 | 2.86 | 24.87 |
| E | 1.17 | 1.33 | 1.50 | 0.75 | 0.00 | 0.00 | 0.75 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 | 0.14 | 0.00 | 0.29 | 0.14 | 0.29 | 0.00 | 0.67 | 0.40 | 1.40 | 0.71 | 1.14 | 0.17 | 0.17 | 0.00 | 0.00 | 0.67 | 0.71 | 0.42 | 3.62 |
| F | 0.00 | 0.33 | 0.33 | 0.50 | 0.50 | 0.43 | 0.25 | 0.00 | 0.17 | 0.67 | 0.50 | 0.20 | 0.00 | 0.00 | 0.14 | 0.00 | 0.00 | 0.00 | 0.14 | 0.50 | 0.00 | 0.20 | 0.20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.16 | 1.42 |
| G | 0.33 | 0.33 | 1.00 | 1.38 | 0.50 | 1.00 | 1.00 | 1.50 | 0.83 | 0.33 | 0.50 | 0.60 | 1.14 | 1.17 | 0.71 | 1.20 | 0.86 | 0.57 | 0.43 | 0.25 | 1.33 | 0.60 | 0.40 | 0.29 | 0.71 | 0.00 | 0.00 | 0.00 | 0.25 | 0.17 | 0.29 | 0.63 | 5.52 |
| H | 0.17 | 0.33 | 1.17 | 1.13 | 0.25 | 0.14 | 0.00 | 0.33 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.17 | 0.29 | 0.00 | 0.00 | 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 | 0.29 | 0.15 | 1.29 |
| I | 2.00 | 1.00 | 1.67 | 1.88 | 3.25 | 2.71 | 2.00 | 2.50 | 3.00 | 3.17 | 2.25 | 1.00 | 0.86 | 1.50 | 1.00 | 1.00 | 0.86 | 1.00 | 2.57 | 1.25 | 1.83 | 2.00 | 1.60 | 2.29 | 2.71 | 1.17 | 1.50 | 1.50 | 2.00 | 1.83 | 1.57 | 1.82 | 15.85 |
| x | 3.67 | 2.00 | 2.50 | 2.00 | 1.00 | 1.43 | 2.50 | 4.33 | 4.33 | 4.00 | 3.25 | 2.20 | 2.71 | 0.83 | 0.57 | 0.40 | 0.29 | 0.86 | 1.57 | 2.25 | 3.50 | 3.40 | 2.80 | 4.14 | 7.14 | 4.33 | 4.50 | 5.67 | 4.50 | 2.00 | 2.14 | 2.80 | 24.37 |
| r | 0.33 | 0.67 | 0.50 | 0.13 | 0.25 | 0.43 | 1.50 | 0.33 | 0.50 | 0.50 | 0.50 | 0.20 | 0.00 | 0.17 | 0.29 | 0.00 | 0.14 | 0.57 | 1.29 | 0.50 | 0.17 | 0.20 | 2.00 | 1.29 | 0.57 | 0.00 | 0.67 | 0.33 | 0.50 | 0.00 | 0.57 | 0.49 | 4.23 |
| s | 2.83 | 3.00 | 3.00 | 5.00 | 5.00 | 3.43 | 2.75 | 3.00 | 3.50 | 2.00 | 1.50 | 0.40 | 0.57 | 1.17 | 1.00 | 1.40 | 1.57 | 3.14 | 4.43 | 2.50 | 2.00 | 2.40 | 3.00 | 3.29 | 3.71 | 3.00 | 3.50 | 3.33 | 3.00 | 3.00 | 2.29 | 2.70 | 23.50 |
| a | 2.83 | 3.33 | 6.50 | 7.00 | 7.00 | 6.71 | 6.50 | 4.33 | 4.17 | 3.67 | 3.00 | 3.40 | 2.71 | 3.00 | 3.14 | 3.20 | 2.14 | 1.43 | 1.00 | 1.75 | 4.33 | 4.60 | 3.00 | 2.71 | 2.43 | 2.33 | 2.33 | 2.17 | 4.50 | 5.17 | 3.71 | 3.68 | 32.03 |
| h | 0.33 | 0.33 | 0.50 | 0.75 | 0.00 | 0.00 | 0.25 | 0.33 | 0.50 | 0.00 | 0.00 | 0.00 | 0.14 | 0.17 | 0.29 | 0.40 | 0.00 | 0.00 | 0.29 | 0.00 | 0.00 | 0.40 | 0.20 | 0.43 | 0.29 | 0.00 | 0.17 | 0.17 | 0.00 | 0.00 | 0.43 | 0.21 | 1.78 |
| k | 2.50 | 3.50 | 2.33 | 1.38 | 1.00 | 1.14 | 1.75 | 1.67 | 1.33 | 1.83 | 1.75 | 1.00 | 1.57 | 1.67 | 1.29 | 0.60 | 1.00 | 0.14 | 0.71 | 1.25 | 2.50 | 1.60 | 2.40 | 1.57 | 2.00 | 1.83 | 2.00 | 2.17 | 1.50 | 1.33 | 1.86 | 1.62 | 14.08 |
| x | 4.00 | 2.00 | 3.17 | 3.38 | 4.00 | 3.43 | 3.00 | 5.00 | 6.33 | 5.67 | 5.00 | 3.20 | 3.00 | 2.17 | 1.86 | 1.40 | 1.14 | 1.43 | 3.43 | 2.25 | 3.00 | 3.40 | 2.80 | 4.71 | 6.43 | 2.83 | 3.17 | 4.17 | 5.00 | 3.00 | 2.71 | 3.42 | 29.77 |
| o | 5.67 | 7.33 | 8.50 | 10.00 | 7.75 | 8.57 | 10.25 | 8.83 | 7.50 | 5.33 | 4.25 | 3.00 | 3.43 | 3.83 | 3.43 | 3.20 | 2.71 | 3.71 | 4.71 | 5.00 | 8.17 | 7.20 | 8.20 | 6.86 | 8.00 | 7.17 | 8.00 | 8.17 | 7.75 | 6.50 | 6.57 | 6.44 | 56.02 |
| i | 2.83 | 3.33 | 3.33 | 2.75 | 2.50 | 1.00 | 2.00 | 0.17 | 0.50 | 0.83 | 0.75 | 1.00 | 1.29 | 1.00 | 1.14 | 1.40 | 1.00 | 1.00 | 1.14 | 0.75 | 1.17 | 1.60 | 2.00 | 1.43 | 1.00 | 0.67 | 0.83 | 0.67 | 1.25 | 2.00 | 1.57 | 1.42 | 12.32 |
| c | 0.00 | 0.17 | 0.33 | 0.13 | 0.00 | 0.14 | 0.00 | 0.00 | 0.00 | 0.17 | 0.00 | 0.00 | 0.00 | 0.00 | 0.14 | 0.00 | 0.29 | 0.00 | 0.00 | 0.25 | 0.17 | 0.40 | 0.40 | 0.43 | 0.71 | 0.83 | 1.17 | 0.83 | 0.00 | 0.00 | 0.14 | 0.22 | 1.88 |
| CV | 212.00 | 274.83 | 292.17 | 291.88 | 213.00 | 182.86 | 210.25 | 175.67 | 171.67 | 152.67 | 143.00 | 112.20 | 132.29 | 140.50 | 130.57 | 131.20 | 117.57 | 85.43 | 133.57 | 128.00 | 204.50 | 192.40 | 230.80 | 199.14 | 207.29 | 166.67 | 197.33 | 195.00 | 185.50 | 193.67 | 206.57 | 180.97 | 100 |
| CVn | 138.33 | 199.00 | 216.17 | 224.88 | 172.50 | 138.57 | 130.50 | 107.17 | 94.33 | 82.50 | 64.25 | 42.60 | 47.86 | 40.67 | 19.29 | 8.60 | 8.86 | 6.43 | 50.57 | 43.25 | 102.00 | 100.80 | 130.80 | 112.86 | 133.00 | 113.50 | 128.67 | 126.83 | 114.75 | 117.83 | 135.00 | 101.69 | 56.19 |
| CVs | 73.67 | 75.83 | 76.00 | 67.00 | 40.50 | 44.29 | 79.75 | 68.50 | 77.33 | 70.17 | 78.75 | 69.60 | 84.43 | 99.83 | 111.29 | 122.60 | 108.71 | 79.00 | 83.00 | 84.75 | 102.50 | 91.60 | 100.00 | 86.29 | 74.29 | 53.17 | 68.67 | 68.17 | 70.75 | 75.83 | 71.57 | 79.28 | 43.81 |
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