Stretching of the toroidal field and generation of magnetosonic waves in differentially rotating plasma

Details Stretching of the toroidal field and generation of magnetosonic waves in differentially rotating plasma Stretching of the toroidal field and generation of magnetosonic waves in differentially rotating plasma

2007-10-11

arxiv.org/abs/0710.2359v1

Astron.Astrophys.473:701B,2007

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures

Scientific paper

10.1051/0004-6361:20077726

We evaluate the generation of magnetosonic waves in differentially rotating magnetized plasma. Differential rotation leads to an increase of the azimuthal field by winding up the poloidal field lines into the toroidal field lines. An amplification of weak seed perturbations is considered in this time-dependent background state. It is shown that seed perturbations can be amplified by several orders of magnitude in a differentially rotating flow. The only necessary condition for this amplification is the presence of a non-vanishing component of the magnetic field in the direction of the angular velocity gradient.

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