Statistics of sunspot activity
September, 2001
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 | Average | % |
| W | 152.75 | 148.33 | 159.50 | 159.33 | 269.00 | 199.33 | 262.67 | 268.00 | 266.50 | 211.75 | 169.00 | 240.50 | 217.00 | 215.50 | 195.67 | 186.00 | 156.75 | 198.00 | 218.00 | 250.50 | 257.25 | 239.75 | 268.50 | 312.25 | 309.75 | 274.50 | 276.25 | 211.67 | 219.00 | 255.00 | 225.60 | 100 |
| Wn | 77.50 | 72.33 | 73.50 | 68.33 | 102.00 | 55.67 | 71.33 | 75.25 | 68.25 | 47.75 | 35.50 | 52.50 | 44.67 | 54.50 | 67.00 | 86.25 | 83.00 | 122.75 | 149.25 | 159.50 | 156.50 | 162.00 | 154.25 | 177.50 | 186.00 | 170.75 | 169.25 | 126.33 | 119.75 | 138.00 | 104.24 | 46.21 |
| Ws | 75.25 | 76.00 | 86.00 | 91.00 | 167.00 | 143.67 | 191.33 | 192.75 | 198.25 | 164.00 | 133.50 | 188.00 | 172.33 | 161.00 | 128.67 | 99.75 | 73.75 | 75.25 | 68.75 | 91.00 | 100.75 | 77.75 | 114.25 | 134.75 | 123.75 | 103.75 | 107.00 | 85.33 | 99.25 | 117.00 | 121.36 | 53.79 |
| n | 6.25 | 6.67 | 8.50 | 8.33 | 14.00 | 10.00 | 11.00 | 10.50 | 9.75 | 7.75 | 6.25 | 9.00 | 9.00 | 8.00 | 9.00 | 10.75 | 10.00 | 13.00 | 13.25 | 14.25 | 12.50 | 12.50 | 12.75 | 15.00 | 14.25 | 14.25 | 15.00 | 12.33 | 11.00 | 13.00 | 10.93 | 100 |
| A | 0.50 | 0.00 | 0.00 | 0.00 | 0.50 | 0.67 | 0.00 | 1.00 | 1.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.33 | 1.75 | 0.25 | 0.50 | 0.75 | 1.50 | 1.00 | 0.50 | 0.00 | 1.00 | 1.00 | 0.50 | 1.25 | 0.67 | 0.25 | 1.00 | 0.60 | 5.47 |
| B | 0.50 | 0.67 | 0.50 | 0.00 | 0.00 | 0.00 | 0.33 | 1.00 | 0.25 | 0.50 | 0.00 | 0.50 | 0.33 | 0.00 | 0.33 | 1.25 | 0.00 | 0.25 | 1.75 | 1.75 | 0.50 | 0.75 | 1.00 | 0.00 | 0.50 | 0.00 | 0.75 | 0.33 | 0.00 | 1.00 | 0.49 | 4.50 |
| C | 0.00 | 0.00 | 2.00 | 1.67 | 1.50 | 0.33 | 2.67 | 0.00 | 0.75 | 0.50 | 1.00 | 1.50 | 1.00 | 0.50 | 0.33 | 2.25 | 2.00 | 3.00 | 3.25 | 2.50 | 2.25 | 2.25 | 2.50 | 3.25 | 1.50 | 1.00 | 0.75 | 0.33 | 1.00 | 3.00 | 1.49 | 13.60 |
| D | 1.00 | 1.67 | 2.50 | 2.00 | 3.00 | 1.33 | 1.33 | 2.75 | 2.25 | 1.50 | 2.25 | 3.00 | 2.67 | 3.50 | 3.33 | 1.00 | 2.00 | 3.50 | 3.25 | 4.25 | 5.50 | 5.00 | 4.00 | 5.25 | 5.00 | 5.75 | 4.75 | 4.00 | 4.50 | 4.00 | 3.19 | 29.23 |
| E | 0.00 | 1.00 | 0.00 | 0.33 | 1.50 | 2.00 | 2.00 | 2.25 | 1.25 | 0.75 | 1.00 | 0.50 | 1.00 | 0.50 | 0.67 | 0.00 | 0.25 | 0.25 | 0.50 | 0.75 | 0.25 | 0.00 | 0.50 | 0.25 | 0.50 | 0.50 | 1.00 | 1.33 | 1.00 | 1.00 | 0.76 | 6.96 |
| F | 1.25 | 0.33 | 1.00 | 0.67 | 0.50 | 1.67 | 1.00 | 1.25 | 1.50 | 1.25 | 1.00 | 1.50 | 1.33 | 1.50 | 1.67 | 2.00 | 1.00 | 0.75 | 1.00 | 0.50 | 0.75 | 1.50 | 1.50 | 1.00 | 1.00 | 1.25 | 1.00 | 1.33 | 1.00 | 1.00 | 1.13 | 10.37 |
| G | 0.75 | 0.67 | 0.50 | 0.67 | 2.00 | 0.00 | 1.67 | 1.25 | 1.50 | 1.50 | 0.75 | 1.00 | 1.00 | 1.00 | 0.67 | 1.00 | 0.75 | 0.25 | 0.25 | 1.00 | 1.25 | 0.50 | 1.25 | 1.25 | 0.75 | 0.75 | 0.25 | 0.00 | 0.00 | 0.00 | 0.81 | 7.37 |
| H | 0.25 | 0.00 | 0.00 | 0.67 | 0.50 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.50 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.10 | 0.89 |
| I | 2.00 | 2.33 | 2.00 | 2.33 | 4.50 | 4.00 | 2.00 | 1.00 | 1.00 | 0.75 | 0.25 | 1.00 | 1.67 | 1.00 | 0.67 | 1.50 | 3.50 | 4.00 | 2.25 | 2.00 | 1.00 | 2.00 | 2.00 | 2.75 | 4.00 | 4.50 | 5.25 | 4.33 | 3.25 | 2.00 | 2.36 | 21.61 |
| x | 1.00 | 0.67 | 0.50 | 0.00 | 0.50 | 0.67 | 0.33 | 2.00 | 1.25 | 1.50 | 0.00 | 0.50 | 0.33 | 0.00 | 1.67 | 3.00 | 0.25 | 0.75 | 2.50 | 3.25 | 1.50 | 1.25 | 1.00 | 1.00 | 1.50 | 0.50 | 2.00 | 1.00 | 0.25 | 2.00 | 1.09 | 9.96 |
| r | 0.00 | 0.33 | 0.50 | 0.00 | 0.00 | 0.67 | 0.00 | 0.25 | 0.25 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 1.00 | 0.50 | 0.75 | 0.25 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.25 | 0.67 | 0.00 | 0.00 | 0.22 | 2.03 |
| s | 1.50 | 2.67 | 5.00 | 3.67 | 6.50 | 2.33 | 2.33 | 2.75 | 2.25 | 1.25 | 1.00 | 1.00 | 2.33 | 4.00 | 3.33 | 3.50 | 4.25 | 6.25 | 5.00 | 3.00 | 2.75 | 4.75 | 4.50 | 6.25 | 6.00 | 8.00 | 7.25 | 5.33 | 5.00 | 5.00 | 3.96 | 36.22 |
| a | 1.50 | 1.00 | 0.50 | 3.00 | 4.50 | 4.00 | 5.67 | 2.75 | 3.75 | 2.75 | 3.25 | 6.50 | 5.00 | 3.00 | 3.00 | 2.25 | 4.00 | 3.25 | 4.00 | 5.50 | 5.75 | 3.75 | 3.50 | 4.75 | 4.75 | 3.75 | 3.25 | 3.33 | 4.00 | 3.00 | 3.63 | 33.25 |
| h | 0.25 | 0.00 | 0.00 | 0.33 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.33 | 0.25 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.08 | 0.74 |
| k | 2.00 | 2.00 | 2.00 | 1.33 | 2.00 | 2.33 | 2.67 | 2.75 | 2.25 | 1.75 | 1.75 | 1.00 | 1.33 | 1.00 | 0.67 | 1.25 | 1.50 | 1.50 | 1.25 | 1.75 | 2.25 | 2.75 | 3.50 | 3.00 | 2.00 | 2.00 | 2.00 | 2.00 | 1.75 | 3.00 | 1.94 | 17.79 |
| x | 2.75 | 2.33 | 2.00 | 3.00 | 5.50 | 4.67 | 2.00 | 2.00 | 2.25 | 1.75 | 0.25 | 1.00 | 1.67 | 1.00 | 2.00 | 3.25 | 4.00 | 5.00 | 3.25 | 3.50 | 2.00 | 2.50 | 2.00 | 4.00 | 5.00 | 5.00 | 6.50 | 5.00 | 3.50 | 3.00 | 3.06 | 27.96 |
| o | 2.25 | 3.00 | 5.50 | 4.33 | 6.00 | 1.67 | 6.00 | 4.75 | 4.75 | 3.75 | 4.00 | 6.00 | 5.00 | 5.00 | 4.67 | 5.50 | 4.75 | 6.75 | 8.25 | 8.25 | 7.75 | 6.75 | 7.75 | 8.75 | 7.00 | 6.75 | 5.50 | 4.33 | 5.00 | 7.00 | 5.56 | 50.86 |
| i | 1.00 | 0.67 | 0.50 | 0.67 | 1.50 | 3.00 | 2.33 | 2.75 | 1.75 | 1.50 | 1.25 | 0.50 | 1.00 | 0.50 | 2.33 | 2.00 | 1.25 | 1.25 | 0.75 | 1.50 | 1.50 | 2.25 | 1.75 | 1.00 | 1.25 | 1.25 | 1.75 | 3.00 | 2.25 | 2.00 | 1.53 | 14.03 |
| c | 0.25 | 0.67 | 0.50 | 0.33 | 1.00 | 0.67 | 0.67 | 1.00 | 1.00 | 0.75 | 0.75 | 1.50 | 1.33 | 1.50 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 1.00 | 1.25 | 1.00 | 1.25 | 1.25 | 1.00 | 1.25 | 1.25 | 0.00 | 0.25 | 1.00 | 0.78 | 7.14 |
| CV | 145.00 | 158.00 | 185.00 | 170.33 | 288.50 | 210.67 | 243.33 | 259.00 | 228.00 | 170.75 | 175.50 | 185.50 | 201.67 | 204.50 | 184.67 | 168.50 | 179.00 | 220.00 | 211.25 | 233.75 | 262.75 | 281.25 | 303.75 | 319.00 | 272.00 | 301.00 | 285.50 | 241.00 | 228.00 | 263.00 | 226.01 | 100 |
| CVn | 67.75 | 63.33 | 62.50 | 69.67 | 111.00 | 62.00 | 78.00 | 74.50 | 68.00 | 47.25 | 47.00 | 57.50 | 44.33 | 59.00 | 63.33 | 58.75 | 85.75 | 135.25 | 120.25 | 123.75 | 144.50 | 165.50 | 182.50 | 197.75 | 155.25 | 172.50 | 153.25 | 115.67 | 109.25 | 138.00 | 101.10 | 44.73 |
| CVs | 77.25 | 94.67 | 122.50 | 100.67 | 177.50 | 148.67 | 165.33 | 184.50 | 160.00 | 123.50 | 128.50 | 128.00 | 157.33 | 145.50 | 121.33 | 109.75 | 93.25 | 84.75 | 91.00 | 110.00 | 118.25 | 115.75 | 121.25 | 121.25 | 116.75 | 128.50 | 132.25 | 125.33 | 118.75 | 125.00 | 124.90 | 55.27 |
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