Determining the Temporal and Spatial Coherence of Plasmaspheric Hiss Waves in the Magnetosphere

Determining the Temporal and Spatial Coherence of Plasmaspheric Hiss Waves in the Magnetosphere
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确定磁层中等离子体层希斯波的时间和空间相干性

DOI:
10.1029/2020ja028635
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发表时间:
2021
期刊:
Space Physics
影响因子:
--
通讯作者:
Zhang S
Zhang S
中科院分区:
--
文献类型:
--
作者:
Zhang S

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等离子体层嘶嘶声是地球磁层中最重要的等离子体波之一,通过波粒相互作用,通过俯仰角散射高能电子,对辐射带动力学做出贡献。越来越多的证据表明,波粒相互作用的时间和空间变化是构建辐射带扩散模型的重要因素。嘶嘶声的振幅被认为在等离子体层顶内的长距离和长时间尺度上是相干的,这意味着嘶嘶声可以在辐射带电子的漂移轨迹上作用数小时。在这项研究中,我们调查了2012年11月至2019年7月两个货车艾伦探针之间等离子体层嘶嘶声的空间和时间相干性。我们找到了13264个事件,我们可以确定作为空间距离和时间滞后的函数的波振幅的相关性,以研究等离子体层嘶嘶声的空间和时间相干性。统计结果表明,等离子体层嘶的时空相关性随着L-壳层的增大而减小,当L> 1.45时,等离子体层嘶的时空相关性变得不相干.在L = 0.4.5以内,我们发现嘶嘶声在高达1,1,500 km的空间范围内是相干的,时间滞后长达1,100分钟。我们发现,等离子体层嘶嘶声的空间和时间的相干性并不强烈地依赖于地磁指数(AL*)或磁本地时。我们讨论了我们的研究结果与相关的理解全球等离子体层嘶嘶声波的特性和它们在辐射带动力学中的作用的后果。
Plasmaspheric hiss is one of the most important plasma waves in the Earth's magnetosphere to contribute to radiation belt dynamics by pitch‐angle scattering energetic electrons via wave‐particle interactions. There is growing evidence that the temporal and spatial variability of wave‐particle interactions are important factors in the construction of diffusion‐based models of the radiation belts. Hiss amplitudes are thought to be coherent across large distances and on long timescales inside the plasmapause, which means that hiss can act on radiation belt electrons throughout their drift trajectories for many hours. In this study, we investigate both the spatial and temporal coherence of plasmaspheric hiss between the two Van Allen Probes from November 2012 to July 2019. We find ∼3,264 events where we can determine the correlation of wave amplitudes as a function of both spatial distance and time lag in order to study the spatial and temporal coherence of plasmaspheric hiss. The statistical results show that both the spatial and temporal correlation of plasmaspheric hiss decrease with increasingL‐shell, and become incoherent atL> ∼4.5. Inside ofL= ∼4.5, we find that hiss is coherent to within a spatial extent of up to ∼1,500 km and a time lag up to ∼10 min. We find that the spatial and temporal coherence of plasmaspheric hiss does not depend strongly on the geomagnetic index (AL*) or magnetic local time. We discuss the ramifications of our results with relevance to understanding the global characteristics of plasmaspheric hiss waves and their role in radiation belt dynamics.
DOI: 10.1029/2019gl083118
发表时间: 2019-06
影响因子: 5.2
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