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Magnetic fields permeate the Universe. They are found in planets, stars, accretion discs, galaxies, clusters of galaxies, and the intergalactic medium. While there is often a component of the fieldâ€¦ (More)

- Alexander A. Schekochihin, Steven C. Cowley, Jason L. Maron, Leonid M. Malyshkin
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2002

A weak fluctuating magnetic field embedded into a a turbulent conducting medium grows exponentially while its characteristic scale decays. In the interstellar medium and protogalactic plasmas, theâ€¦ (More)

- Alexander A. Schekochihin, Steven C. Cowley, Jason L. Maron, James C. McWilliams
- Physical review letters
- 2004

We report a series of numerical simulations showing that the critical magnetic Reynolds number Rm(c) for the nonhelical small-scale dynamo depends on the Reynolds number Re. Namely, the dynamo isâ€¦ (More)

We study the intermittency and field-line structure of the MHD turbulence in plasmas with very large magnetic Prandtl numbers. In this regime, which is realized in the interstellar medium, someâ€¦ (More)

- Alexander A. Schekochihin, Steven C. Cowley, Jason L. Maron, James C. McWilliams
- Physical review letters
- 2004

The amplification of magnetic fields in a highly conducting fluid is studied numerically. During growth, the magnetic field is spatially intermittent: it does not uniformly fill the volume, but isâ€¦ (More)

Magnetohydrodynamic (MHD) turbulence is encountered in a wide variety of astrophysical plasmas, including accretion disks, the solar wind, and the interstellar and intracluster medium. On smallâ€¦ (More)

We consider the problem of incompressible, forced, nonhelical, homogeneous, isotropic MHD turbulence with no mean magnetic field. This problem is essentially different from the case with externallyâ€¦ (More)

- Alexander A. Schekochihin, Peter H. Haynes, Steven C. Cowley
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2004

We consider a solvable model of the decay of scalar variance in a single-scale random velocity field. We show that if there is a separation between the flow scale k(-1 )(flow ) and the box size k(-1â€¦ (More)

Magnetohydrodynamic (MHD) turbulence is encountered in a wide variety of astrophysical plasmas, including accretion disks, the solar wind, and the interstellar and intracluster medium. On smallâ€¦ (More)

The effect of magnetic shear and shear flow on local gravitationally induced instabilities is investigated. A simple model is constructed allowing for an arbitrary entropy gradient and a shear plasmaâ€¦ (More)