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We investigate the role of the magnetohydrodynamic (MHD) turbulence measuredby Voyager in the very local interstellar medium (VLISM) in modeling theInterstellar Boundary Explorer (IBEX) ribbon. We demonstrate that the mirroringby compressible modes of MHD turbulence dominates over that by the meanmagnetic field. Based on the new mirror diffusion mechanism identified byLazarian and Xu for particles with large pitch angles in MHD turbulence, wefind that the mirror diffusion can both confine pickup ions and preserve theirinitial pitch angles, and thus accounts for the enhanced intensity of energeticneutral atoms that return to the heliosphere. The ribbon width is determined byboth the range of pitch angles for effective turbulent mirroring and the fieldline wandering induced by Alfv\'{e}nic modes. It in turn provides a constrainton the amplitude of magnetic fluctuations of fast modes. The field linewandering also affects the coherence of the ribbon structure across the sky. Byextrapolating the magnetic energy spectrum measured by Voyager, we find thatthe injection scale of the turbulence in the VLISM is less than $\sim 500$ aufor the ribbon structure to be coherent.

Toward interpreting the IBEX ribbon with mirror diffusion in interstellar turbulent magnetic fields