A model for plasma flows and shocks in the high-altitude cusp

Details A model for plasma flows and shocks in the high-altitude cusp A model for plasma flows and shocks in the high-altitude cusp

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10414647c&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A7, p. 14647-14654

Physics

5

Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Magnetosheath, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

A new model for the interaction of a supersonic magnetosheath flow with the high-altitude cusp is proposed. Archival and recent observations have suggested that the cusp is a region of indentation, where solar wind plasma is found earthward of the nominal magnetopause position. It is proposed that a supersonic solar wind flow interacts with such an indentation by being first accelerated through an expansion fan and then decelerated by a shock. For most realistic parameters the shock cannot originate from the deepest part of the cusp but must be detached. The rarefaction of the magnetosheath plasma leads to a rather shallow cusp (<1Re) and also implies that the cusp becomes less indented the more tailward it is located.

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