Short large-amplitude magnetic structures (SLAMS) frequently appear near the bow shock. Inside steepening SLAMS, whistler-mode waves are coherently generated at their leading edges. These waves are crucial for electron dynamics, energy conversion and magnetic reconnection near the shock. Nevertheless, the characteristics and generation of the whistler-mode waves inside SLAMS are still unclear. In this study, we conducted a statistical analysis of whistler-mode waves within SLAMS near the Earth's bow shock to investigate their properties and generation mechanisms. We found that these waves are mainly excited by electron temperature anisotropy with 99% of them falling below the nonlinear resonant threshold. The combination of a low background magnetic field and intense steepening at SLAMS' leading edge makes it the main source region of whistler-mode waves and may induce the nonlinear resonance of whistler-mode waves.

中文翻译：

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短大振幅磁场结构内的惠斯勒模式波：特征和产生机制

短大振幅磁结构（SLAMS）经常出现在弓激波附近。在陡峭 SLAMS 内，哨声模式波在其前缘处相干地生成。这些波对于电子动力学、能量转换和激波附近的磁重联至关重要。然而，SLAMS 内部哨声模式波的特征和产生仍不清楚。在这项研究中，我们对地球弓激波附近的 SLAMS 内的哨声模式波进行了统计分析，以研究它们的特性和产生机制。我们发现这些波主要是由电子温度各向异性激发的，其中 99% 的波低于非线性谐振阈值。低背景磁场和SLAMS前缘的强烈陡化相结合，使其成为哨声模式波的主要源区，并可能引起哨声模式波的非线性谐振。