Efficiency of proton-driven Weibel instability at thermalizing initially two-temperature astrophysical plasmas

Physics – Plasma Physics

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Scientific paper

Whether an efficient collisonless temperature equilibration mechanism exists for a two-temperature ion-electron plasma, with Ti>Te, is important for understanding astrophysical phenomena such as radiatively inefficient accretion flows and supernova remnants. Here we study whether Weibel instability driven by a proton temperature anisotropy can be such a mechanism. Analysis and PIC simulations find that in an unmagnetized plasma, although the instability grows at a rate much larger than the ion-electron collision rate, the saturated magnetic field is low and inefficient to couple the ions and electrons. It is speculated that in a magnetized plasma the instability can provide a more efficient coupling.

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