Increase in the critical frequency of the ionospheric F region prior to the substorm expansion phase

Details Increase in the critical frequency of the ionospheric F region prior to the substorm expansion phase Increase in the critical frequency of the ionospheric F region prior to the substorm expansion phase

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ge%26ae..49..200b&link_type=abstract

Geomagnetism and Aeronomy, Volume 49, Issue 2, pp.200-209

Computer Science

Sound

1

94.30.Lr, 94.20.Dj, Magnetic Storms, Substorms, F Region

Scientific paper

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 foF2 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 foF2 can be used in a short-term prediction of the ionospheric disturbance onset and space weather on the whole.

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