The two-stream plasma instability in a velocity shear and its role in the solar wind-Venus ionosphere interaction

Physics – Plasma Physics

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[2159] Interplanetary Physics / Plasma Waves And Turbulence, [5435] Planetary Sciences: Solid Surface Planets / Ionospheres, [6295] Planetary Sciences: Solar System Objects / Venus, [7859] Space Plasma Physics / Transport Processes

Scientific paper

We study the linear development of the two-stream instability in a plasma consisting of cold ions, assumed at rest and taken to represent planetary ions, and a hot, streaming population of electrons, representing the solar wind. The stability of quasi-global perturbations is analyzed as a function of plasma density, temperature and streaming velocity, using a QR algorithm to compute the growth rate of eigenmodes of the coupled fluid equations of motion for both species. The sense of the cross-flow, viscous-like momentum transfer from the streaming plasma to ionospheric ions, is determined on the basis of an heuristic estimation following a Reynolds averaging procedure of the cross-flow momentum flux term in the equation of motion.

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