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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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