Influence of lower-hybrid instabilities on reconnection in asymmetric antiparallel configuration

Details Influence of lower-hybrid instabilities on reconnection in asymmetric antiparallel configuration Influence of lower-hybrid instabilities on reconnection in asymmetric antiparallel configuration

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm23b2047r&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM23B-2047

Physics

Plasma Physics

[2723] Magnetospheric Physics / Magnetic Reconnection, [7835] Space Plasma Physics / Magnetic Reconnection, [7863] Space Plasma Physics / Turbulence

Scientific paper

Influence of self-consistently generated Lower-Hybrid (LH) instabilities on the structure and long-time evolution of reconnection layers is investigated in asymmetric antiparallel configuration using large-scale fully kinetic 3D simulations. In regimes with large asymmetry, moderate ratio of electron to ion temperature, and low plasma β , electromagnetic LH instability localized near the X-line produces substantial modifications to the average force balance in the form of fluctuation-induced drag and stress terms. However, this mode is expected to saturate at small amplitude under parameters typical of the Earth's magnetopause. In these cases LH turbulence is predominantly localized around the separatrices on the low-β side of the current sheet. The simulation results are found to be consistent with a survey of low latitude magnetopause current sheet crossing by THEMIS satellite. A detailed comparison of the simulation results with observations is presented for several cases.

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