Generation of Field-Aligned Energy Flux at the Plasma Sheet Boundary Layer

Details Generation of Field-Aligned Energy Flux at the Plasma Sheet Boundary Layer Generation of Field-Aligned Energy Flux at the Plasma Sheet Boundary Layer

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm51d..01l&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM51D-01

Physics

[2748] Magnetospheric Physics / Magnetotail Boundary Layers, [2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2753] Magnetospheric Physics / Numerical Modeling, [2764] Magnetospheric Physics / Plasma Sheet

Scientific paper

When the magnetotail is disturbed by sudden variations such as substorm, field-aligned Poynting flux plays an important role in delivering the perturbed energy into the auroral region. This transient signal can be expressed in terms of nonlinear Alfvenic variations at the plasma sheet boundary layer(PSBL). We examine how much field-aligned flux can be generated at the PSBL for arbitrary forms of perturbations in the central plasma sheet. By adopting a three-dimensional full MHD model, which is well confirmed in nonlinear MHD wave tests based on the exact solutions(Lee et al, 2000), we show how much nonlinear mode conversion generates field-aligned Poynting flux. Our results suggest that the field-aligned flux increases as the perturbation magnitude grows in the magnetotail, but there is a saturation limit in the nonlinear mode conversion process. We compare this maximum limit with the ground-based onset signature and discuss general mechanism of field-aligned flux from the distant tail region to the auroral region.

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