Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-01-17
Phys.Rev. E71 (2005) 038301
Astronomy and Astrophysics
Astrophysics
3 pages, 1 figure; accepted by Physical Review E
Scientific paper
10.1103/PhysRevE.71.038301
In the paper we comment on (R\"udiger & Shalybkov, Phys. Rev. E. 69, 016303 (2004) (RS)), the instability of the Taylor--Couette flow interacting with a homogeneous background field subject to Hall effect is studied. We correct a falsely generalizing interpretation of results presented there which could be taken to disprove the existence of the Hall--drift induced magnetic instability described in Rheinhardt and Geppert, Phys. Rev. Lett. 88, 101103. It is shown that in contrast to what is suggested by RS, no additional shear flow is necessary to enable such an instability with a non--potential magnetic background field, whereas for a curl--free one it is. In the latter case, the instabilities found in RS in situations where neither a hydrodynamic nor a magneto--rotational instability exists are demonstrated to be most likely magnetic instead of magnetohydrodynamic. Further, some minor inaccuracies are clarified.
Geppert Ulrich
Rheinhardt Matthias
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