资源环境科技发展态势分析平台

We investigate solitary magnetic structures in the foreshock of Mars and Earth. The structures exhibit pulse-like magnetic field and density enhancements along with plasma heating and local solar wind ion reflection. The structures at Mars resemble the foreshock structures developed from Ultra-Low-Frequency electromagnetic waves gyro-resonant with solar wind ions at Earth, and propagate toward the magnetosphere. We perform fully kinetic simulations to reproduce the solitary structures and the nonlinear evolution of ion distribution functions, illustrating their resonance with solar wind ions. The structures present self-induced foreshock turbulence that can have space weather effects. Our results advance the fundamental understanding of how solar wind interacts with planetary magnetospheres, and have potential impact on the current picture of planet-origin ion escape.