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Table 3
Percentage of Type I ionospheric storms and Type II ionospheric storms observed by the AIS-INGV ionosonde at the Ionospheric Observatory of Rome during the minimum of solar activity at the turn of solar cycles 21–22, 22–23 and 23–24.
| Year | Percentage of Type I storms | Percentage of Type II storms (%) |
|---|---|---|
| 1985 | 3.9% | 5.2 |
| 1986 | 1.4% | 13.3 |
| 1987 | 8.9 | 10.3 |
| 1995 | 8.3 | 0.0 |
| 1996 | 3.7 | 2.8 |
| 1997 | 6.9 | 9.9 |
| 2007 | 4.6 | 1.8 |
| 2008 | 5.2 | 7.8 |
| 2009 | 3.6 | 0.0 |
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