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We investigate the so-called nonresonant 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 nonresonant mode in SN1006 and RX J1713.7-3946 are presented.
Reville, B., Kirk, J., & Duffy, P. (2008). Environmental limits on the nonresonant cosmic-ray current-driven instability. International journal of modern physics B., vol. 17, no. 10, pg. 1795-1801. doi:10.1142/S021827180801342X