On the well-posedness of a linearized plasma-vacuum interface problem in ideal compressible MHD

Details On the well-posedness of a linearized plasma-vacuum interface problem in ideal compressible MHD On the well-posedness of a linearized plasma-vacuum interface problem in ideal compressible MHD

2010-05-22

arxiv.org/abs/1005.4109v1

Mathematics

Analysis of PDEs

25 pages

Scientific paper

We study the initial-boundary value problem resulting from the linearization of the plasma-vacuum interface problem in ideal compressible magnetohydrodynamics (MHD). We suppose that the plasma and the vacuum regions are unbounded domains and the plasma density does not go to zero continuously, but jumps. For the basic state upon which we perform linearization we find two cases of well-posedness of the "frozen" coefficient problem: the "gas dynamical" case and the "purely MHD" case. In the "gas dynamical" case we assume that the jump of the normal derivative of the total pressure is always negative. In the "purely MHD" case this condition can be violated but the plasma and the vacuum magnetic fields are assumed to be non-zero and non-parallel to each other everywhere on the interface. For this case we prove a basic a priori estimate in the anisotropic weighted Sobolev space $H^1_*$ for the variable coefficient problem.

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