Statistics of sunspot activity
September, 2000
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 | 180.25 | 162.33 | 169.00 | 178.00 | 144.00 | 152.50 | 146.25 | 116.50 | 100.00 | 43.00 | 19.25 | 34.00 | 82.25 | 86.50 | 103.50 | 137.00 | 141.33 | 145.25 | 144.25 | 170.50 | 193.33 | 168.00 | 160.75 | 130.67 | 194.00 | 224.75 | 241.00 | 205.33 | 155.50 | 139.00 | 142.27 | 100 |
| Wn | 130.00 | 115.00 | 92.50 | 80.00 | 80.00 | 84.50 | 86.75 | 80.50 | 65.33 | 24.50 | 15.50 | 11.00 | 26.50 | 35.75 | 52.50 | 82.33 | 85.00 | 98.75 | 99.00 | 110.25 | 117.67 | 78.75 | 68.25 | 37.67 | 103.50 | 125.50 | 138.33 | 93.67 | 55.75 | 37.25 | 77.07 | 54.17 |
| Ws | 50.25 | 47.33 | 76.50 | 98.00 | 64.00 | 68.00 | 59.50 | 36.00 | 34.67 | 18.50 | 3.75 | 23.00 | 55.75 | 50.75 | 51.00 | 54.67 | 56.33 | 46.50 | 45.25 | 60.25 | 75.67 | 89.25 | 92.50 | 93.00 | 90.50 | 99.25 | 102.67 | 111.67 | 99.75 | 101.75 | 65.20 | 45.83 |
| n | 11.25 | 10.67 | 10.50 | 10.00 | 7.00 | 8.50 | 8.75 | 8.00 | 6.67 | 3.00 | 1.50 | 2.75 | 6.00 | 5.25 | 5.50 | 5.00 | 5.67 | 5.50 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 6.33 | 7.75 | 9.25 | 11.67 | 10.00 | 8.50 | 7.00 | 6.90 | 100 |
| A | 1.00 | 1.33 | 0.50 | 1.00 | 0.00 | 2.00 | 1.75 | 1.00 | 0.33 | 1.50 | 0.50 | 0.50 | 1.75 | 1.50 | 0.25 | 0.00 | 0.00 | 0.00 | 0.25 | 1.00 | 0.00 | 0.50 | 0.00 | 0.00 | 0.50 | 1.25 | 1.67 | 1.33 | 0.75 | 0.25 | 0.75 | 10.83 |
| B | 0.25 | 1.00 | 4.50 | 2.50 | 0.00 | 1.50 | 1.75 | 1.50 | 1.33 | 0.50 | 0.25 | 0.00 | 2.75 | 0.25 | 0.75 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 1.33 | 1.00 | 1.25 | 1.00 | 0.82 | 11.88 |
| C | 3.75 | 2.33 | 2.00 | 2.50 | 0.00 | 1.00 | 0.75 | 0.50 | 1.67 | 0.00 | 0.25 | 1.50 | 0.50 | 1.00 | 1.25 | 0.67 | 0.67 | 0.75 | 0.00 | 0.50 | 0.67 | 0.50 | 1.50 | 1.00 | 1.50 | 2.50 | 2.33 | 3.33 | 2.25 | 1.50 | 1.29 | 18.68 |
| D | 2.25 | 2.33 | 1.00 | 1.00 | 2.00 | 0.50 | 0.75 | 1.00 | 1.00 | 0.00 | 0.00 | 0.00 | 0.75 | 2.50 | 2.50 | 2.67 | 3.67 | 2.50 | 2.00 | 0.50 | 0.67 | 1.00 | 1.75 | 2.33 | 3.00 | 1.75 | 0.00 | 0.67 | 1.25 | 1.25 | 1.42 | 20.57 |
| E | 0.75 | 1.00 | 0.50 | 0.50 | 2.00 | 2.00 | 1.75 | 1.50 | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.67 | 0.67 | 1.25 | 0.50 | 0.75 | 0.33 | 0.50 | 0.50 | 1.00 | 0.25 | 0.25 | 0.00 | 0.33 | 2.00 | 2.00 | 0.73 | 10.63 |
| F | 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 | 0.75 | 1.25 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.50 | 1.00 | 0.67 | 0.00 | 0.00 | 0.34 | 4.91 |
| G | 0.50 | 0.00 | 0.50 | 0.50 | 0.00 | 0.00 | 0.25 | 0.50 | 0.00 | 1.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.75 | 1.00 | 1.00 | 1.33 | 1.00 | 0.00 | 0.00 | 0.25 | 1.25 | 2.00 | 1.67 | 0.75 | 0.00 | 0.49 | 7.13 |
| H | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| I | 2.75 | 2.67 | 1.50 | 2.00 | 3.00 | 1.50 | 1.75 | 2.00 | 1.33 | 0.00 | 0.25 | 0.75 | 0.25 | 0.00 | 0.50 | 1.00 | 0.33 | 0.25 | 0.50 | 0.00 | 0.67 | 0.50 | 0.25 | 1.00 | 1.25 | 0.25 | 3.33 | 1.00 | 0.25 | 1.00 | 1.06 | 15.38 |
| x | 1.25 | 2.33 | 5.00 | 3.50 | 0.00 | 3.50 | 3.50 | 2.50 | 1.67 | 2.00 | 0.75 | 0.50 | 4.50 | 1.75 | 1.00 | 0.00 | 0.33 | 0.00 | 0.25 | 1.00 | 0.33 | 0.50 | 0.00 | 0.00 | 0.50 | 1.75 | 3.00 | 2.33 | 2.00 | 1.25 | 1.57 | 22.71 |
| r | 1.50 | 0.67 | 1.00 | 0.50 | 0.00 | 0.50 | 0.25 | 0.00 | 0.33 | 0.00 | 0.50 | 1.00 | 0.25 | 0.25 | 0.50 | 1.00 | 0.33 | 0.25 | 0.25 | 0.25 | 1.00 | 0.25 | 0.00 | 0.00 | 0.25 | 0.25 | 1.00 | 0.67 | 0.25 | 0.00 | 0.43 | 6.28 |
| s | 4.50 | 4.33 | 1.00 | 2.00 | 1.00 | 1.00 | 3.00 | 3.50 | 3.33 | 0.50 | 0.25 | 1.25 | 0.25 | 0.50 | 2.25 | 1.33 | 2.00 | 0.75 | 1.00 | 0.50 | 1.33 | 1.75 | 2.00 | 3.33 | 2.75 | 2.75 | 3.67 | 3.00 | 2.50 | 1.75 | 1.97 | 28.54 |
| a | 3.50 | 2.67 | 3.50 | 4.00 | 6.00 | 3.00 | 1.25 | 1.00 | 1.00 | 0.50 | 0.00 | 0.00 | 1.00 | 2.75 | 1.00 | 2.67 | 3.00 | 2.75 | 1.75 | 1.75 | 0.33 | 0.75 | 2.00 | 2.00 | 3.25 | 3.00 | 2.67 | 3.00 | 3.00 | 2.25 | 2.18 | 31.56 |
| h | 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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| k | 0.50 | 0.67 | 0.00 | 0.00 | 0.00 | 0.50 | 0.75 | 1.00 | 0.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 0.00 | 0.00 | 1.75 | 1.75 | 1.50 | 2.00 | 1.75 | 1.00 | 1.00 | 1.00 | 1.50 | 1.33 | 1.00 | 0.75 | 1.75 | 0.75 | 10.91 |
| x | 3.75 | 4.00 | 2.00 | 3.00 | 3.00 | 3.50 | 3.50 | 3.00 | 1.67 | 1.50 | 0.75 | 1.25 | 2.00 | 1.50 | 0.75 | 1.00 | 0.33 | 0.25 | 0.75 | 1.00 | 0.67 | 1.00 | 0.25 | 1.00 | 1.75 | 1.50 | 5.00 | 2.33 | 1.00 | 1.25 | 1.81 | 26.21 |
| o | 6.75 | 5.67 | 8.00 | 6.00 | 2.00 | 3.00 | 3.25 | 3.50 | 3.67 | 1.50 | 0.75 | 1.50 | 4.00 | 3.00 | 3.25 | 2.67 | 3.67 | 3.00 | 2.25 | 2.00 | 3.00 | 2.50 | 2.50 | 3.33 | 4.00 | 5.25 | 5.67 | 6.67 | 5.50 | 3.50 | 3.71 | 53.78 |
| i | 0.50 | 1.00 | 0.50 | 1.00 | 2.00 | 1.50 | 1.75 | 1.50 | 1.33 | 0.00 | 0.00 | 0.00 | 0.00 | 0.75 | 1.00 | 0.67 | 1.33 | 1.50 | 1.25 | 1.00 | 0.00 | 0.25 | 0.75 | 1.00 | 0.75 | 1.25 | 0.33 | 0.00 | 1.25 | 2.25 | 0.88 | 12.76 |
| c | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.67 | 0.33 | 0.75 | 0.75 | 1.00 | 1.33 | 1.25 | 1.50 | 1.00 | 1.25 | 1.25 | 0.67 | 1.00 | 0.75 | 0.00 | 0.50 | 7.25 |
| CV | 147.00 | 138.00 | 76.50 | 86.50 | 108.00 | 97.00 | 114.50 | 123.00 | 87.67 | 25.50 | 9.75 | 18.50 | 28.00 | 62.00 | 104.00 | 87.33 | 106.33 | 155.50 | 147.00 | 128.50 | 145.67 | 143.25 | 129.00 | 153.33 | 161.00 | 183.25 | 161.33 | 148.67 | 140.75 | 139.75 | 111.89 | 100 |
| CVn | 101.50 | 92.33 | 48.00 | 41.00 | 59.00 | 51.50 | 68.00 | 74.50 | 52.67 | 2.50 | 3.25 | 2.50 | 3.00 | 18.25 | 56.75 | 46.67 | 72.33 | 115.25 | 102.00 | 93.25 | 88.33 | 76.00 | 70.00 | 83.00 | 95.75 | 91.25 | 79.00 | 72.00 | 57.50 | 45.00 | 62.07 | 55.48 |
| CVs | 45.50 | 45.67 | 28.50 | 45.50 | 49.00 | 45.50 | 46.50 | 48.50 | 35.00 | 23.00 | 6.50 | 16.00 | 25.00 | 43.75 | 47.25 | 40.67 | 34.00 | 40.25 | 45.00 | 35.25 | 57.33 | 67.25 | 59.00 | 70.33 | 65.25 | 92.00 | 82.33 | 76.67 | 83.25 | 94.75 | 49.82 | 44.52 |
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