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Table 2
Percentages of positive and negative foF2 anomalies, with a minimum duration of 3 h, observed by the Rome ionospheric station, computed over the total number of foF2 anomalies observed during night-time hours and day-time hours respectively.
| Positive foF2 anomalies (%) |
Negative foF2 anomalies (%) |
||||||
|---|---|---|---|---|---|---|---|
| Winter | Equinox | Summer | Winter | Equinox | Summer | ||
| 1985 | Night-time | 15.5 | 11.2 | 24.4 | 24.4 | 11.2 | 13.3 |
| Day-time | 13.5 | 27.0 | 32.4 | 8.1 | 8.1 | 10.9 | |
| 1986 | Night-time | 8.6 | 14.9 | 19.1 | 17.1 | 12.7 | 27.6 |
| Day-time | 17.6 | 11.7 | 52.9 | 11.7 | 5.9 | 0.0 | |
| 1987 | Night-time | 20.9 | 18.7 | 32.5 | 2.4 | 6.9 | 18.6 |
| Day-time | 25.9 | 25.9 | 29.6 | 7.4 | 3.8 | 7.4 | |
| 1995 | Night-time | 7.4 | 3.7 | 14.8 | 11.2 | 29.6 | 33.3 |
| Day-time | 20.0 | 10.0 | 20.0 | 0.0 | 30.0 | 20.0 | |
| 1996 | Night-time | 16.2 | 18.9 | 27.1 | 5.4 | 10.8 | 21.6 |
| Day-time | 21.5 | 35.7 | 28.5 | 0.0 | 14.3 | 0.0 | |
| 1997 | Night-time | 20.8 | 4.1 | 33.4 | 20.8 | 8.4 | 12.5 |
| Day-time | 29.5 | 29.5 | 23.5 | 0.0 | 11.7 | 5.8 | |
| 2007 | Night-time | 11.2 | 20.0 | 20.0 | 17.8 | 15.5 | 15.5 |
| Day-time | 25.0 | 50.0 | 25.0 | 0.0 | 0.0 | 0.0 | |
| 2008 | Night-time | 29.1 | 16.1 | 16.1 | 22.5 | 0.0 | 16.2 |
| Day-time | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
| 2009 | Night-time | 33.3 | 12.8 | 10.3 | 20.5 | 7.7 | 15.4 |
| Day-time | 37.5 | 50.0 | 12.5 | 0.0 | 0.0 | 0.0 | |
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