Cosmic ray transport in non-resonant current driven MHD turbulence

Reville, Brian; O'Sullivan, Stephen; Duffy, Peter; Kirk, John G.

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Cosmic ray transport in non-resonant current driven MHD turbulence

Reville, B., O'Sullivan, S., Duffy, P., & Kirk, J. G. (2007). Cosmic ray transport in non-resonant current driven MHD turbulence. Talk presented at Seventh European Workshop on Collisionless Shocks. Paris, France. 2007-11-07 - 2007-11-09.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-7BB2-4 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-7BB3-2

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Creators:
Reville, Brian¹, Author
O'Sullivan, Stephen², Author
Duffy, Peter², Author
Kirk, John G.¹, Author

Affiliations:
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550
2UCD School of Mathematical Science, Belfield, Dublin 4, Ireland, ou_persistent22

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Abstract: Both resonant and non-resonant instabilities are responsible for the self-generation of hydromagnetic waves in the precursor of collisionless shock waves. These waves facilitate the scattering of relativistic particles necessary for the diffusive acceleration of cosmic rays. We perform high-resolution magnetohydrodynamic simulations of the non-resonant cosmic-ray driven instability, in which the unstable waves are excited beyond the linear regime, and calculate the transport properties of test-particles in a snapshot of the resultant field. It is shown that even for modest field amplification that sub-Bohm diffusion can be achieved for a range of energies. This provides the first explicit demonstration that self-excited turbulence reduces the diffusion coefficient and has important implications for cosmic ray transport and acceleration in supernova remnants.

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Language(s): eng - English

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Identifiers: eDoc: 324262

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Title: Seventh European Workshop on Collisionless Shocks

Place of Event: Paris, France

Start-/End Date: 2007-11-07 - 2007-11-09

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