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Increase in the critical frequency of the ionospheric F region prior to the substorm expansion phase
Ist Teil von
Geomagnetism and Aeronomy, 2009-04, Vol.49 (2), p.200-209
Ort / Verlag
Dordrecht: SP MAIK Nauka/Interperiodica
Erscheinungsjahr
2009
Link zum Volltext
Quelle
SpringerLink
Beschreibungen/Notizen
Specific variations in the critical frequency of the ionospheric
F
2
layer during magnetospheric substorms have been found based on the data of vertical sounding stations in Europe and North America. Maximal attention has been paid to the positive peaks of Δ
foF
2 with a duration of 6–8 h before the beginning of the substorm expansion phase (
T
0
). The possible physical mechanisms by which these peaks are formed (related to the impact of fast particles in the foreshock region of the solar wind on the Earth’s magnetosphere and different for middle and high latitudes) have been considered. The positive peaks of Δ
foF
2 can be used in a short-term prediction of the ionospheric disturbance onset and space weather on the whole.