陨石碎裂的多到达 infrasound：碎片特征与传播效应在细尺度分层大气中的对比
Multi-Arrival Infrasound from Meteoroids: Fragmentation Signatures versus Propagation Effects in a Fine-Scale Layered Atmosphere
AI总结：
研究通过分析陨石碎裂的 infrasound 特征，揭示细尺度大气分层对声波的影响，区分碎片破裂与传播效应，提升 infrasound 监测的准确性。
摘要：
陨石碎裂的 infrasound 特征常常模糊：多个到达是否表明复杂的破裂过程，还是仅仅是层状大气的扭曲效应？解决这一模糊性对于准确的能量估计和来源重建至关重要。在本研究中，我们通过分析由南部安大略陨石网络和位于同一地点的埃尔金菲尔德 infrasound 阵列观测到的具有良好约束条件的陨石事件的独特区域数据集，来解决这一挑战。我们采用伪微分抛物线方程（PPE）模拟，以量化平流层和低热层中的细尺度重力波结构如何在小于 300 公里的范围内修改声波形。我们的建模揭示，尽管细尺度分层可以拉伸信号并产生扩散振荡尾部，但它们不会在 140 公里以下的距离产生离散的高振幅脉冲分裂。通过将这些结果应用于罕见的多到达事件 20060305，我们证明其在 100 公里范围内独特的双到达与大气多路径效应不一致，并提供了分离破裂事件的明确证据。这些发现建立了新的诊断标准，以区分源物理和传播伪影，提高了 infrasound 作为自然爆炸、空间碎片再入和灾难性发射故障监测工具的可靠性。
英文摘要：
Infrasonic signatures of meteoroid fragmentation are frequently ambiguous: do multiple arrivals signify a complex breakup or merely the distorting effects of a layered atmosphere? Resolving this ambiguity is critical for accurate energy estimates and source reconstruction. In this study, we address this challenge by analyzing a unique regional dataset of well-constrained meteoroid events observed by the Southern Ontario Meteor Network and the co-located Elginfield Infrasound Array. We employ pseudo-differential parabolic equation (PPE) simulations to quantify how fine-scale gravity-wave structures in the stratosphere and lower thermosphere modify acoustic waveforms at ranges <300 km. Our modeling reveals that while fine-scale layering can stretch signals and generate diffuse oscillatory tails, it does not produce discrete, high-amplitude pulse splitting at ranges below ~140 km. By applying these results to the rare multi-arrival event 20060305, we demonstrate that its distinct double arrival at 100 km range is inconsistent with atmospheric multipathing and provides definitive evidence of separate fragmentation episodes. These findings establish new diagnostic criteria for separating source physics from propagation artifacts, improving the reliability of infrasound as a monitoring tool for natural bolides, space debris re-entries, and catastrophic launch failures.
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