Highlights Many authors see ionospheric disturbances a few days prior to geomagnetic storm. The disturbances are registered in foF2 and TEC. These ionospheric disturbances could be precursors of coming geomagnetic storm.
Abstract The problem of occurrence of disturbances of the ionospheric F2-layer parameters prior to the beginning of geomagnetic storms is discussed. It is shown that disturbances (substantial deviations from quiet conditions) of both the critical frequency foF2 and the total electron content (TEC) in an ionospheric column are found in many studies a few hours and sometimes two–three days before the SC (sudden storm commencement) moment. The amplitudes of the aforementioned disturbances are on the average 30–60%, however, in some cases they could exceed 100%. Deviations from the quiet conditions of both signs are possible, however positive pre-storm disturbances of foF2 and TEC are found more often. Some statistical results of the analysis of the pre-storm effects in foF2 according to the data of the Slough (Chilton) station are presented.
Behavior of the ionospheric F region prior to geomagnetic storms
Advances in Space Research ; 64 , 7 ; 1375-1387
2019-07-10
13 pages
Article (Journal)
Electronic Resource
English
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