Plasma Transport in Auroral Arcs and Parallel Electric Field Structures

Details Plasma Transport in Auroral Arcs and Parallel Electric Field Structures Plasma Transport in Auroral Arcs and Parallel Electric Field Structures

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm51a0358k&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM51A-0358

Physics

2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2463 Plasma Convection, 2704 Auroral Phenomena (2407)

Scientific paper

We investigate the connection between plasma transport along discrete auroral arcs, parallel electric fields and density gradients with help of Cluster E-field and density measurements. A method developed by Karlsson et al. (2004) is used to separate between spatial and temporal variations in the Cluster multipoint measurements. An analysis of Cluster data for strong E-field events reveals that in most cases the E-field structure is dipolar and appears close to a plasma population boundary. It can be shown that a density gradient perpendicular to a dipolar E-field structure causes a net plasma flow along the auroral arc, causing locally a change in the ionospheric convection. The possible consequences of a local decoupling between ionospheric and magnetospheric plasma convection are discussed.

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