Lepton-driven Nonresonant Streaming Instability

A strong super-Alfv\'{e}nic drift of energetic particles (or cosmic rays, CRs) in a magnetized plasma can amplify the magnetic field significantly through non-resonant streaming instability (NRSI). While traditional analysis is done for an ion current, here we use kinetic particle-in-cell simulations to study how NRSI behaves when it driven by electrons or mixture and positrons. In particular, characterize growth rate, spectrum, helicity unstable modes, as well level at saturation. Our results are potentially relevant several space/astrophysical environments (e.g, electron strahl solar wind, oblique non-relativistic shocks, around pulsar wind nebulae) also laboratory experiments.