Alfven Vortex Filament-Like Structures Observed by Cluster Downstream the Bow-Shock

Details Alfven Vortex Filament-Like Structures Observed by Cluster Downstream the Bow-Shock Alfven Vortex Filament-Like Structures Observed by Cluster Downstream the Bow-Shock

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm51c0379m&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM51C-0379

Physics

7851 Shock Waves, 2724 Magnetopause, Cusp, And Boundary Layers, 2728 Magnetosheath, 2752 Mhd Waves And Instabilities, 2772 Plasma Waves And Instabilities

Scientific paper

In the downstream region of the perpendicular bow-shock, localised coherent magnetic structures are observed. Using the four Cluster satellites we show that the structures are localized in time and space and that they are transported by the plasma flow. We identify these structures as field-aligned cylindrical currents almost in magnetostatic equilibrium but with a vortical structure, Alfvén vortex filaments. Analysing a set of such Alfvén filaments we find that they are distributed quasi-periodically in the plane perpendicular to an average magnetic field. Investigating several shock crossings, we show that the characteristic scale of a filament depends on the distance to the shock front.

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