Comment on "Helical MRI in magnetized Taylor-Couette flow"

Details Comment on "Helical MRI in magnetized Taylor-Couette flow" Comment on "Helical MRI in magnetized Taylor-Couette flow"

2007-05-07

arxiv.org/abs/0705.0883v2

Astronomy and Astrophysics

Astrophysics

2 pages, 2 figures, submitted to Phys. Rev. E (comments)

Scientific paper

Liu et al. [Phys. Rev. E 74, 056302 (2006)] have presented a WKB analysis of the helical magnetorotational instability (HMRI), and claim that it does not exist for Keplerian rotation profiles. We show that if radial boundary conditions are included, the HMRI can exist even for rotation profiles as flat as Keplerian, provided only that at least one of the boundaries is sufficiently conducting.

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