http://arxiv.org/abs/1706.06339

Magnetic fields, compressibility and turbulence are important factors in many terrestrial and astrophysical processes. While energy dynamics, i.e. how energy is transferred within and between kinetic and magnetic reservoirs, has been previously studied in the context of incompressible magnetohydrodynamic (MHD) turbulence, we extend shell-to-shell energy transfer analysis to the compressible regime. We derive four new transfer functions specifically capturing compressibility effects in the kinetic and magnetic cascade, and capturing energy exchange via magnetic pressure. To illustrate their viability, we perform and analyze four simulations of driven MHD turbulence in the sub- and supersonic regime with two different codes. On the one hand, our analysis reveals robust characteristics across regime and numerical method, e.g. a weak local energy exchange via magnetic tension. On the other hand, we show that certain functions, e.g. the compressive component of the magnetic energy cascade, exhibit a more complex behavior. Having established a basis for the analysis in the compressible regime, the method can now be applied to study a broader parameter space.

Read this paper on arXiv…

P. Grete, B. OShea, K. Beckwith, et. al.

Wed, 21 Jun 17

26/64

Comments: 16 pages, 8 figures, under review at Physics of Plasmas , comments welcome

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