Abstract

The ionospheric response to a geomagnetic disturbance is a complex set of events caused by both the upper atmosphere and ionosphere parameters and characteristics of the magnetosphere and solar wind. A situation is particularly complicated during the large geomagnetic storm. We present the results derived from investigating of the ionospheric response to large geomagnetic storms with the values of index Dst < (-200 &divide; -300nT) observed during two last cycles of solar activity. Our analysis of the behavior of the ionosphere is based on using the measurements from a network of ionospheric stations located at different latitudes in the longitudinal sector of 60-150&deg;E. Also there are presented the results of numerical modeling of ionospheric parameters during the geomagnetic storm on April, 2000&delta; which show a good agreement of calculations and measurements. As the results modeling illustrates prolonged negative ionospheric disturbances observed during geomagnetic storms may be produced by the change of thermosphere composition.

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