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We examine the evolution of ion-beam Weibel instability at strongcollisionless shocks in weakly magnetized media. We find that a finitebackground magnetic field substantially affects both linear and nonlinearphases of the instability, depending on whether the background electrons behavemagnetized or not. Particle-in-cell simulations for magnetized electronsidentify a dynamo-like mechanism of magnetic field amplification, whicheventually leads to spontaneous magnetic reconnection. We conclude that thisscenario is applicable to typical young supernova remnant shocks.

Enhanced Magnetic Field Amplification by Ion-Beam Weibel Instability in Weakly Magnetized Astrophysical Shocks