Mirror instability in the heliosheath

Physics

Scientific paper

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2124 Heliopause And Solar Wind Termination, 2126 Heliosphere/Interstellar Medium Interactions, 7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7851 Shock Waves (4455)

Scientific paper

We investigate the nature of the heliosheath plasma behind the Termination Shock across which jump relations in anisotropic MHD are formulated. Along side analytical results for downstream parameters in the strictly parallel and perpendicular cases we numerically solve the Rankine-Hugoniot relations for arbitrary shock angle and strength. We then focus on conditions favorable to the triggering of a temperature anisotropy driven instability, the mirror instability. We confirm results showing that the heliosheath plasma observed by Voyager 1 immediately behind the Termination Shock is mirror unstable. Similar conditions are probable in the heliosheath recently encountered by Voyager 2. The variation with upstream parameters, which may be due to inward or outward motions of the shock, is also addressed. Finally, by comparing with studies in the Earth's magnetosheath context, we formulate predictions on the shapes of mirror associated magnetic fluctuations in the heliosheath. Both hole and peak magnetic structures were indeed observed by Voyager 1 and these shapes correspond to different stages of the mirror instability.

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