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| Titel |
The effects of mesoscale regions of precipitation on the ionospheric dynamics, electrodynamics and electron density in the presence of strong ambient electric fields |
| VerfasserIn |
J. D. Boer, J.-M. A. Noël, J.-P. St.-Maurice |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 28, no. 6 ; Nr. 28, no. 6 (2010-06-23), S.1345-1360 |
| Datensatznummer |
250016850
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| Publikation (Nr.) |
 copernicus.org/angeo-28-1345-2010.pdf |
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| Zusammenfassung |
| We have developed a new high resolution two-dimensional model of the high
latitude ionosphere in which nonlinear advection terms are closely coupled
with the electrodynamics. The model provides a self-consistent description of
the ionospheric feedback on the electrodynamical perturbations produced by
auroral arc-related particle precipitation in regions with strong ambient
electric fields. We find in particular that a heretofore neglected ion
Pedersen advection term can introduce considerable changes in the electron
density profile, the current density distribution, the conductivities and the
electron temperatures. We find that the convective effects can carry the
ionisation more than 150 km outside the precipitation region in a few
minutes, with attendant large changes in the current distribution and
E-region densities that become enhanced outside the region of
particle precipitation. The production of a tongue of ionisation that slowly
decays outside the auroral boundaries contrasts with the sharp geometric
cut-off and associated stronger current densities found in previous studies. |
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