A new scenario applying traffic flow analogy to poleward expansion of auroras
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Published:2019-06-05
Issue:3
Volume:37
Page:381-387
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ISSN:1432-0576
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Container-title:Annales Geophysicae
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language:en
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Short-container-title:Ann. Geophys.
Abstract
Abstract. Transient westward electric fields from the magnetosphere generate
equatorward plasma drifts of the order of kilometers per second in the
auroral ionosphere. This flow channel extends in north–south directions and
is produced in the initial pulse of Pi2 pulsations associated with the field
line dipolarization. Drifts in the ionosphere of the order of kilometers per
second that accumulated plasmas at the low-latitude end of the flow channel
are of such large degree that possible vertical transport effects (including
precipitation) along the field lines may be ignored. In this condition, we
suggest that plasma compression in the ionosphere initiated the dynamic
ionosphere. The dynamic ionosphere includes a nonlinear evolution of the
compressed ionospheric plasmas, generation of field-aligned currents to
satisfy the quasi-neutrality of the ionosphere, and parallel potentials
associated with the excitation of an ion acoustic wave. We will study how
the dynamic ionosphere created auroral expansion.
Publisher
Copernicus GmbH
Subject
Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Atmospheric Science,Geology,Astronomy and Astrophysics
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