Heliopause Instabilities Driven by Plasma-Neutral Interaction: Linear Analysis from Fluid Model

Details Heliopause Instabilities Driven by Plasma-Neutral Interaction: Linear Analysis from Fluid Model Heliopause Instabilities Driven by Plasma-Neutral Interaction: Linear Analysis from Fluid Model

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aipc.1366...77d&link_type=abstract

PARTIALLY IONIZED PLASMAS THROUGHOUT THE COSMOS-PROCEEDINGS OF THE 2010 HUNTSVILLE WORKSHOP. AIP Conference Proceedings, Volume

Physics

Plasma Sheaths, Magnetisation, Solar Wind, Hydrodynamics, Plasma Sheaths, Magnetized Plasmas, Particle Emission, Solar Wind, Implosion Symmetry And Hydrodynamic Instability

Scientific paper

The heliopause (HP) is the outer edge of the heliosphere that separates the tenuous and hot heliosheath plasma from the relatively dense and cool magnetized plasma of the local interstellar medium (LISM). As a surface of tangential discontinuity, the HP is subject to both Rayleigh-Taylor (RT) and Kelvin-Helmholtz (KH) instabilities. The coupling between plasma ions and neutral atoms through charge exchange provides an ``effective gravity'' for RT, while shear flows due to the velocity difference between the heliosheath and the interstellar flows can drive KH modes. We derive the linearized dispersion relations for waves propagating along the surface of this discontinuity using a fluid picture, to study the possibility for both RT and KH instabilities, including a second population of energetic neutrals produced by charge exchange interactions between the hot solar wind plasma in the heliosheath with interstellar hydrogen. We show that due to charge exchange interactions, the HP is unconditionally unstable to all perturbations.

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