Environmental limits on the non-resonant cosmic-ray current-driven   instability
  We investigate the so-called non-resonant cosmic-ray streaming instability, first discussed by Bell (2004). The extent to which thermal damping and ion-neutral collisions reduce the growth of this instability is calculated. Limits on the growth of the non-resonant mode in SN1006 and RX J1713.7-3946 are presented. 
B. Reville, J.G. Kirk, P. Duffy, S. O'Sullivan