supported by the National Natural Science Foundation of China(Grants Nos 40725013 and 40674093);Chinese Academy of Sciences(Grant No KJCX2-YW-N28 9140C08060507ZCZJ19)
Ion pickup by a monochromatic low-frequency Alfv6n wave, which propagates along the background magnetic field, has recently been investigated in a low beta plasma (Lu and Li 2007 Phys. Plasmas 14 042303). In this pa...