Nonlinear growth of firehose and mirror fluctuations in turbulent galaxy-cluster plasmas

Details Nonlinear growth of firehose and mirror fluctuations in turbulent galaxy-cluster plasmas Nonlinear growth of firehose and mirror fluctuations in turbulent galaxy-cluster plasmas

2007-09-24

arxiv.org/abs/0709.3828v2

Phys. Rev. Lett. 100, 081301 (2008)

Astronomy and Astrophysics

Astrophysics

revtex, 4 pages, 1 figure; replaced to match published version

Scientific paper

10.1103/PhysRevLett.100.081301

In turbulent high-beta astrophysical plasmas (exemplified by the galaxy cluster plasmas), pressure-anisotropy-driven firehose and mirror fluctuations grow nonlinearly to large amplitudes, dB/B ~ 1, on a timescale comparable to the turnover time of the turbulent motions. The principle of their nonlinear evolution is to generate secularly growing small-scale magnetic fluctuations that on average cancel the temporal change in the large-scale magnetic field responsible for the pressure anisotropies. The presence of small-scale magnetic fluctuations may dramatically affect the transport properties and, thereby, the large-scale dynamics of the high-beta astrophysical plasmas.

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