Open Access
Table 1
Number of foF2 anomalies, with duration greater than 3 h, classified with respect to the corresponding geomagnetic activity level, together with the yearly values of the F10.7 solar index, the a p geomagnetic index and the number of foF2 anomalies with a minimum duration of 1 h.
| Year | Geomagnetic conditions | No. of foF2 anomalies with a duration greater than 3 h | Yearly mean value of solar index F10.7 | Yearly mean value of a p index | Yearly number of foF2 anomalies with a minimum duration of 1 h |
|---|---|---|---|---|---|
| 1985 | QUIET | 3 | 74.9 | 13.7 | 155 |
| G0 AE > 100 nT | 51 | ||||
| G1 | 10 | ||||
| G2 | 13 | ||||
| G3 | 4 | ||||
| 1986 | QUIET | 4 | 73.8 | 12.5 | 143 |
| G0 AE > 100 nT | 43 | ||||
| G1 | 10 | ||||
| G2 | 3 | ||||
| G3 | 1 | ||||
| G4 | 1 | ||||
| G5 | 1 | ||||
| 1987 | QUIET | 10 | 86.2 | 10.9 | 146 |
| G0 AE > 100 nT | 42 | ||||
| G1 | 12 | ||||
| G2 | 6 | ||||
| 1995 | QUIET | 5 | 76.9 | 12.6 | 120 |
| G0 AE > 100 nT | 12 | ||||
| G1 | 14 | ||||
| G2 | 5 | ||||
| G4 | 1 | ||||
| 1996 | QUIET | 5 | 71.9 | 9.3 | 107 |
| G0 AE > 100 nT | 40 | ||||
| G1 | 5 | ||||
| G2 | 1 | ||||
| 1997 | QUIET | 3 | 81.6 | 8.4 | 101 |
| G0 AE > 100 nT | 29 | ||||
| G1 | 3 | ||||
| G2 | 2 | ||||
| G3 | 4 | ||||
| 2007 | QUIET | 18 | 73.1 | 7.5 | 108 |
| G0 AE > 100 nT | 26 | ||||
| G1 | 8 | ||||
| G2 | 1 | ||||
| 2008 | QUIET | 12 | 68.7 | 6.9 | 77 |
| G0 AE > 100 nT | 22 | ||||
| G1 | 3 | ||||
| G2 | 1 | ||||
| 2009 | QUIET | 31 | 70.8 | 3.9 | 83 |
| G0 AE > 100 nT | 15 | ||||
| G1 | 1 |
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.