利用宇宙线各向异性探测银河系大尺度磁场

Cosmic rays, magnetic field and ordinary matter are the basic components of the Milky Way interstellar medium, but the origin of cosmic rays and magnetic fields so far inconclusive. The high-energy cosmic ray anisotropy is an effective means to answer the basic problem, such as origin, accelerate and propagation of the cosmic ray. The Yangbajing ASγ experiment with high precision observations to the two-dimensional anisotropy of the cosmic ray in sidereal time, but the causation of anisotropy is unsure. The project intends to improve the theory model, try to explain the observed phenomena of cosmic ray anisotropy, further reveal the ralationship between the flow of cosmic ray particles and the galactic magnetic field; in the same time this project is intended to study cosmic ray propagation in the plasma environment by the numerical simulation method, to further clarify the role of the magnetic field environment in the cosmic ray propagation. The results may reveal the cosmic ray anisotropy causes and the relationship between flow of cosmic ray and galactic magnetic field.

宇宙线，磁场和常规物质是银河系星际间介质的三个基本组成部分，但是宇宙线和磁场的起源至今没有定论。高能宇宙线各向异性的研究是回答宇宙线起源、加速、传播等基本问题的有效手段。羊八井ASγ实验高精度地观测到了恒星时的宇宙线两维各向异性，但各向异性的成因至今没有定论。本项目拟对申请人之前建立的大尺度宇宙线流理论模型进行完善，实现对宇宙线各向异性成因及相关实验观测现象的解释，并进一步揭示宇宙线粒子流与银河系磁场的相互关联；同时本项目拟用数值模拟的方法研究宇宙线在等离子体环境下的传播，通过对传播过程的反推进一步阐明磁场环境在宇宙线传播及各向异性形成中的地位。研究结果对揭示宇宙线各向异性成因、宇宙线流与银河系磁场的相互关系具有重要的科学意义。