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. Transient westward electric fields from the magnetosphere generateequatorward plasma drifts of the order of kilometers per second in theauroral ionosphere. This flow channel extends in north–south directions andis produced in the initial pulse of Pi2 pulsations associated with the fieldline dipolarization. Drifts in the ionosphere of the order of kilometers persecond that accumulated plasmas at the low-latitude end of the flow channelare of such large degree that possible vertical transport effects (includingprecipitation) along the field lines may be ignored. In this condition, wesuggest that plasma compression in the ionosphere initiated the dynamicionosphere. The dynamic ionosphere includes a nonlinear evolution of thecompressed ionospheric plasmas, generation of field-aligned currents tosatisfy the quasi-neutrality of the ionosphere, and parallel potentialsassociated with the excitation of an ion acoustic wave. We will study howthe dynamic ionosphere created auroral expansion.

A new scenario applying traffic flow analogy to poleward expansion of auroras