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2009

Magnetic Amplification by Magnetized Cosmic Rays in SNR Shocks

Riquelme, Mario A., Spitkovsky, Anatoly

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(Abridged) X-ray observations of synchrotron rims in supernova remnant (SNR) shocks show evidence of strong magnetic field amplification (a factor of ~100 between the upstream and downstream medium).

This amplification may be due to plasma instabilities driven by shock-accelerated cosmic rays (CRs).
One candidate is the cosmic ray current-driven (CRCD) instability (Bell 2004), caused by the electric current of large Larmor radii CRs propagating parallel to the upstream magnetic field.
Particle-in-cell (PIC) simulations have shown that the back-reaction of the amplified field on CRs would limit the amplification factor of this instability to less than ~10 in galactic SNRs.

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Lyutikov, M. 2009, arXiv:0912.1784
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