Statistics of sunspot activity
September, 1998
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 | 128.00 | 105.25 | 99.00 | 69.00 | 90.00 | 133.75 | 138.67 | 158.50 | 145.75 | 120.00 | 111.50 | 117.50 | 110.75 | 95.75 | 69.75 | 80.50 | 77.25 | 84.75 | 93.00 | 133.75 | 156.67 | 160.67 | 167.50 | 148.75 | 109.50 | 102.00 | 87.00 | 105.00 | 77.75 | 48.75 | 110.87 | 100 |
| Wn | 77.00 | 50.25 | 51.00 | 24.33 | 36.50 | 65.00 | 73.33 | 85.25 | 91.50 | 86.33 | 78.00 | 62.25 | 58.75 | 45.25 | 33.25 | 25.00 | 28.25 | 32.00 | 38.20 | 58.25 | 84.33 | 85.00 | 90.00 | 80.25 | 64.50 | 53.50 | 41.50 | 47.00 | 30.50 | 22.25 | 56.62 | 51.07 |
| Ws | 51.00 | 55.00 | 48.00 | 44.67 | 53.50 | 68.75 | 65.33 | 73.25 | 54.25 | 33.67 | 33.50 | 55.25 | 52.00 | 50.50 | 36.50 | 55.50 | 49.00 | 52.75 | 54.80 | 75.50 | 72.33 | 75.67 | 77.50 | 68.50 | 45.00 | 48.50 | 45.50 | 58.00 | 47.25 | 26.50 | 54.25 | 48.93 |
| n | 5.00 | 4.50 | 5.25 | 3.67 | 4.00 | 6.50 | 7.00 | 8.00 | 7.75 | 7.67 | 6.25 | 7.00 | 7.00 | 6.25 | 5.00 | 6.00 | 6.25 | 5.50 | 6.00 | 7.75 | 8.67 | 8.00 | 9.50 | 8.75 | 6.50 | 6.00 | 6.00 | 7.25 | 6.25 | 4.00 | 6.44 | 100 |
| A | 0.50 | 0.75 | 0.75 | 0.67 | 0.25 | 0.00 | 0.33 | 0.00 | 0.75 | 1.00 | 0.50 | 0.25 | 0.00 | 0.50 | 0.50 | 1.00 | 0.75 | 0.00 | 0.40 | 0.75 | 0.33 | 0.00 | 1.50 | 0.75 | 0.50 | 0.00 | 0.00 | 1.00 | 1.50 | 1.25 | 0.55 | 8.53 |
| B | 0.50 | 0.25 | 0.25 | 0.00 | 0.00 | 0.00 | 0.67 | 1.25 | 1.75 | 1.00 | 0.50 | 0.75 | 0.25 | 0.25 | 0.00 | 2.00 | 1.25 | 0.50 | 0.80 | 1.25 | 2.00 | 0.67 | 0.50 | 2.00 | 0.50 | 0.50 | 0.00 | 0.75 | 0.50 | 0.75 | 0.71 | 11.07 |
| C | 0.50 | 0.50 | 0.75 | 0.33 | 0.25 | 2.25 | 1.33 | 3.00 | 1.25 | 2.00 | 2.25 | 2.25 | 3.00 | 0.75 | 1.00 | 0.75 | 1.25 | 1.50 | 2.20 | 2.25 | 3.33 | 1.67 | 3.50 | 3.00 | 1.50 | 2.00 | 1.00 | 1.75 | 1.75 | 0.00 | 1.63 | 25.29 |
| D | 1.50 | 0.75 | 0.50 | 0.00 | 0.50 | 1.75 | 2.33 | 0.50 | 0.75 | 1.00 | 0.75 | 1.50 | 2.25 | 1.50 | 1.00 | 1.00 | 1.00 | 2.25 | 1.80 | 2.25 | 1.67 | 3.00 | 1.00 | 1.25 | 1.50 | 1.00 | 1.75 | 0.75 | 0.00 | 0.50 | 1.24 | 19.30 |
| E | 0.75 | 0.25 | 0.00 | 0.67 | 1.00 | 0.00 | 0.33 | 0.50 | 1.25 | 0.33 | 0.50 | 0.50 | 0.75 | 0.25 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.27 | 4.18 |
| F | 1.00 | 0.75 | 1.00 | 0.33 | 0.00 | 1.00 | 0.33 | 0.50 | 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 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.18 | 2.80 |
| G | 0.25 | 1.00 | 0.50 | 0.67 | 0.50 | 0.25 | 0.67 | 1.50 | 1.25 | 0.67 | 0.50 | 1.00 | 0.75 | 1.25 | 0.75 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.67 | 0.50 | 0.50 | 0.00 | 0.00 | 1.00 | 0.75 | 0.25 | 0.00 | 0.51 | 7.98 |
| H | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.03 | 0.52 |
| I | 0.00 | 0.25 | 1.25 | 1.00 | 1.50 | 1.25 | 1.00 | 0.75 | 0.75 | 1.67 | 1.25 | 0.75 | 0.00 | 1.75 | 1.75 | 1.00 | 1.50 | 1.00 | 0.80 | 1.25 | 1.33 | 2.00 | 2.00 | 1.25 | 2.00 | 2.25 | 2.25 | 2.00 | 2.25 | 1.50 | 1.31 | 20.34 |
| x | 1.00 | 1.00 | 1.00 | 0.67 | 0.25 | 0.00 | 1.00 | 1.25 | 2.50 | 2.00 | 1.00 | 1.00 | 0.25 | 0.75 | 0.50 | 3.00 | 2.00 | 0.50 | 1.20 | 2.00 | 2.33 | 0.67 | 2.00 | 2.75 | 1.00 | 0.50 | 0.00 | 1.75 | 2.00 | 2.00 | 1.26 | 19.59 |
| r | 0.00 | 0.25 | 0.25 | 0.33 | 0.00 | 0.75 | 0.00 | 0.50 | 0.00 | 0.00 | 0.00 | 0.50 | 0.25 | 0.25 | 0.25 | 1.00 | 0.25 | 0.75 | 0.40 | 0.50 | 0.67 | 0.00 | 1.50 | 0.25 | 0.00 | 0.00 | 0.00 | 0.50 | 0.25 | 0.25 | 0.32 | 4.99 |
| s | 0.75 | 1.00 | 1.75 | 1.00 | 2.75 | 3.00 | 3.33 | 3.25 | 2.50 | 3.33 | 3.25 | 2.75 | 4.00 | 3.25 | 2.75 | 1.00 | 1.25 | 2.25 | 3.00 | 3.25 | 2.33 | 4.67 | 2.00 | 4.25 | 3.50 | 3.50 | 4.00 | 3.00 | 3.25 | 1.50 | 2.71 | 42.13 |
| a | 1.25 | 0.25 | 1.00 | 0.67 | 0.00 | 1.50 | 1.67 | 1.75 | 2.50 | 2.33 | 2.00 | 2.75 | 1.75 | 1.75 | 1.50 | 1.00 | 2.25 | 1.25 | 0.60 | 1.00 | 2.33 | 1.67 | 3.00 | 0.50 | 1.00 | 1.00 | 1.00 | 1.25 | 0.75 | 0.25 | 1.38 | 21.48 |
| h | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.25 | 0.00 | 0.20 | 0.25 | 0.00 | 0.67 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 0.00 | 0.10 | 1.48 |
| k | 1.75 | 2.00 | 1.25 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.25 | 0.00 | 0.00 | 0.00 | 0.50 | 0.25 | 0.00 | 0.00 | 0.25 | 0.75 | 0.60 | 0.75 | 1.00 | 0.33 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.25 | 0.00 | 0.00 | 0.66 | 10.31 |
| x | 0.50 | 1.00 | 2.25 | 1.67 | 1.75 | 1.25 | 1.33 | 0.75 | 1.50 | 2.67 | 1.75 | 1.00 | 0.00 | 2.25 | 2.25 | 2.00 | 2.75 | 1.00 | 1.20 | 2.00 | 1.67 | 2.00 | 3.50 | 2.00 | 2.50 | 2.25 | 2.25 | 3.25 | 3.75 | 2.75 | 1.89 | 29.38 |
| o | 2.75 | 2.50 | 2.00 | 1.00 | 1.25 | 4.00 | 5.00 | 6.00 | 4.50 | 4.00 | 4.00 | 5.50 | 6.25 | 3.75 | 2.75 | 4.00 | 3.50 | 4.25 | 4.60 | 5.00 | 6.67 | 4.67 | 5.00 | 6.50 | 2.50 | 2.75 | 3.75 | 4.00 | 2.50 | 1.25 | 3.87 | 60.12 |
| i | 0.50 | 0.25 | 0.25 | 0.33 | 0.50 | 0.75 | 0.33 | 0.50 | 0.50 | 0.33 | 0.50 | 0.50 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.25 | 0.20 | 0.75 | 0.33 | 1.33 | 1.00 | 0.25 | 1.50 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 | 6.14 |
| c | 1.25 | 0.75 | 0.75 | 0.67 | 0.50 | 0.50 | 0.33 | 0.75 | 1.25 | 0.67 | 0.00 | 0.00 | 0.25 | 0.25 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.28 | 4.36 |
| CV | 144.75 | 123.25 | 106.25 | 80.00 | 95.00 | 135.50 | 134.00 | 142.75 | 116.75 | 90.67 | 76.75 | 93.25 | 137.75 | 99.75 | 65.25 | 42.00 | 65.75 | 95.50 | 94.80 | 112.00 | 104.00 | 149.00 | 112.00 | 112.00 | 107.00 | 103.00 | 122.75 | 95.25 | 46.25 | 27.25 | 101.01 | 100 |
| CVn | 87.75 | 71.25 | 51.25 | 26.00 | 33.50 | 67.75 | 49.67 | 63.50 | 65.00 | 65.00 | 56.50 | 61.75 | 79.75 | 49.75 | 27.75 | 12.25 | 33.00 | 46.50 | 42.20 | 50.00 | 74.00 | 83.67 | 69.00 | 72.25 | 72.00 | 63.00 | 69.75 | 62.75 | 20.25 | 9.50 | 54.54 | 54.00 |
| CVs | 57.00 | 52.00 | 55.00 | 54.00 | 61.50 | 67.75 | 84.33 | 79.25 | 51.75 | 25.67 | 20.25 | 31.50 | 58.00 | 50.00 | 37.50 | 29.75 | 32.75 | 49.00 | 52.60 | 62.00 | 30.00 | 65.33 | 43.00 | 39.75 | 35.00 | 40.00 | 53.00 | 32.50 | 26.00 | 17.75 | 46.46 | 46.00 |
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