Tong Shao, Xinliang Gao, Yangguang Ke, Quanming Lu, Xueyi Wang
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引用次数: 0
摘要
磁声波(MS),即离子伯恩斯坦模式波,是地球磁层中常见的等离子体波之一,对调节带电粒子动力学非常重要。MS 波如何在磁层中传播对了解该波的全球分布至关重要,但目前仍不清楚。虽然之前的研究表明 MS 波可以被细尺度密度结构反射,但长期以来,本底等离子体对 MS 波的消散一直被忽视。在本研究中,我们进行了一维(1-D)粒子入胞(PIC)模拟,研究 MS 波在密度结构中的传播,其中包括吸收和反射。我们发现,在考虑 MS 波在密度结构中的传播时,吸收与反射同样重要,而且两者都与密度结构的形状密切相关。具体来说,MS 波的反射率与密度结构的高度和宽度分别呈正相关和负相关,而 MS 波的吸收率与密度结构的高度和宽度均呈正相关。我们的研究证明了 MS 波传播过程中吸收的重要性,这可能有助于更好地理解 MS 波在地球磁层中的分布。
The effects of plasma density structure on the propagation of magnetosonic waves: 1-D particle-in-cell simulations
Magnetosonic (MS) waves, i.e., ion Bernstein mode waves, are one of the common plasma waves in the Earth’s magnetosphere, which are important for regulating charged particle dynamics. How MS waves propagate in the magnetosphere is critical to understanding the global distribution of the waves, but it remains unclear. Although previous studies present that MS waves can be reflected by fine-scale density structures, the dissipation of waves by background plasma has long been neglected. In this study, we perform one-dimensional (1-D) particle-in-cell (PIC) simulations to study the propagation of MS waves through density structures, where both absorption and reflection have been included. We find that absorption is as important as reflection when considering the propagation of MS waves through density structures, and both of them are strongly dependent on the shape of density structures. Specifically, the reflectivity of MS waves is positively and negatively correlated with the height and width of density structures, respectively, while the absorptivity of MS waves has a positive correlation with both the height and width of density structures. Our study demonstrates the significance of absorption during the propagation of MS waves, which may help better understand the distribution of MS waves in the Earth’s magnetosphere.
期刊介绍:
Frontiers in Physics publishes rigorously peer-reviewed research across the entire field, from experimental, to computational and theoretical physics. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers, academics, engineers and the public worldwide.