Cusp Injected Dispersive Ions as a Source for the Cold Dense Plasma Sheet: Simulation Results

Details Cusp Injected Dispersive Ions as a Source for the Cold Dense Plasma Sheet: Simulation Results Cusp Injected Dispersive Ions as a Source for the Cold Dense Plasma Sheet: Simulation Results

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51b1642w&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM51B-1642

Physics

2706 Cusp, 2724 Magnetopause And Boundary Layers, 2753 Numerical Modeling, 2764 Plasma Sheet, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

The discovery more than a decade ago of a cold, dense plasma sheet near Earth during periods of northward IMF has prompted interest in mechanisms for its origin. While transport of magnetosheath ions across the low-latitude boundary layer via viscous interactions has also been considered, recent attention has focused on the possibility of injection at the high-latitude cusps, with reconnection providing direct access to the magnetosphere. In order for cusp-injected particles to remain trapped, simultaneous dual-lobe reconnection is required. Newly-filled flux tubes can then be expected to shorten as the result of field-line tension and convect around the flanks as they interchange with lower entropy, un-filled magnetospheric flux tubes. Observations of repeated, overlapping dispersive ion signatures near Earth favour this cusp injection scenario. Using particle tracking within electric and magnetic fields generated by the OpenGGCM global MHD model for an event with extended periods of northward IMF, we produce spatially- determined, low-altitude dispersive ion signatures. Direct comparison of simulation results, including synthetic spectrograms, with corresponding observations made by the FAST satellite support the dual-lobe injection picture over competing source mechanisms.

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