Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 37, issue 2
Articles | Volume 37, issue 2
https://doi.org/10.5194/angeo-37-201-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-37-201-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 37, issue 2
Regular paper
 | 
09 Apr 2019
Regular paper |  | 09 Apr 2019

On the convection of ionospheric density features

John D. de Boer, Jean-Marc A. Noël, and Jean-Pierre St.-Maurice

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Short summary
Modelling aurorae, we asked what boundary condition (BC) to use for the E field on the upper boundary. Typically a Dirichlet BC is used, since processes above the domain generate E. But then conductivity structures trigger FACs driven immediately by magnetospheric convection, even though it is a finite energy source, delayed by the Alfvén speed. If the BC is not ideal, then E x B drift in the ionosphere depends on the plasma's properties. So we investigated.
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