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Geophysical Research Letters
Article . 1997 . Peer-reviewed
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Field‐aligned current distributions generated by a divergent Hall current

Authors: Stephan C. Buchert; Frank Budnik;

Field‐aligned current distributions generated by a divergent Hall current

Abstract

In a horizontally homogeneous high‐latitude ionosphere a steady state Hall current closes within the E region and does not contribute to the interaction between the ionosphere and magnetosphere. When the steady state assumption is given up, Hall currents driven by a non‐zero ∂B/∂t become divergent and must transiently close via the magnetosphere. It is shown, that this process is of non‐local nature and can redistribute the field‐aligned current in space and time. At scales of tens of kilometers the effect becomes significant for frequencies at about 1 Hz and above, at larger scales even for lower frequencies. The rearrangement of the field‐aligned current is such that elongated structures tend to warp, and thus it resembles some of the typical dynamic evolution of auroral forms. Even a transient local amplification of the current density is possible.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
12
Average
Top 10%
Top 10%
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