Comment on 'Alfven Instability in a Compressible Flow' [Phys. Rev. Lett. 101, 245001 (2008)]

Details Comment on 'Alfven Instability in a Compressible Flow' [Phys. Rev. Lett. 101, 245001 (2008)] Comment on 'Alfven Instability in a Compressible Flow' [Phys. Rev. Lett. 101, 245001 (2008)]

2009-04-28

arxiv.org/abs/0904.4384v1

Phys. Rev. Lett., vol. 103, 019501 (2009)

Physics

Plasma Physics

Scientific paper

10.1103/PhysRevLett.103.019501

In a recent paper [Y. Taroyan, Phys. Rev. Lett 101, 245001 (2008) it is
claimed that a new MHD instability of the Alfven wave has been found:
incompressible Alfven modes propagating in a compressible spatially varying
flow were apparently exponentially amplified. We show that the results of the
work follow from an impossible equilibrium and therefore should be disregarded.

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