Quasi-Periodic Emissions in Saturn's Magnetosphere and Their Effects on Electrons

IF 4.6 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Geophysical Research Letters Pub Date : 2025-01-08 DOI:10.1029/2024gl112061
S. Teng, Dedong Wang, Alexander Y. Drozdov, Yuri Y. Shprits, Zeyin Wu, Y. X. Hao, Z. Yao, J. Zhang
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Abstract

Investigations into quasiperiodic (QP) whistler mode emissions within Saturn's magnetosphere have uncovered distinctive characteristics of these emissions, which display a nearly periodic rising tone structure in the wave spectrogram, characterized by modulation periods of several minutes. These QP emissions are predominantly observed at low L-shells around 5 and near the magnetic equator. Utilizing a quasi-linear analysis framework, we evaluate the effects of these waves on the dynamics of energetic electrons. Our analysis suggests that these QP emissions can efficiently cause the loss of electrons within the energy range from 10 to 60 keV over a timescale of tens of minutes. By incorporating these findings into Fokker-Planck simulations, we find minimal acceleration effects. This study is the first to examine QP emissions and their implications for energetic electron dynamics in Saturn's magnetosphere, highlighting their potentially significant contribution to the magnetospheric processes and dynamics.
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土星磁层中的准周期发射及其对电子的影响
对土星磁层中的准周期(QP)哨声模式发射的研究发现了这些发射的独特特征,它们在波谱图中显示出几乎周期性的音调上升结构,其特征是调制周期为几分钟。这些QP发射主要在低l -壳层附近和磁赤道附近观察到。利用准线性分析框架,我们评估了这些波对高能电子动力学的影响。我们的分析表明,这些QP发射可以在几十分钟的时间尺度内有效地导致能量范围从10到60 keV的电子损失。通过将这些发现与福克-普朗克模拟相结合,我们发现了最小的加速度效应。这项研究首次研究了QP辐射及其对土星磁层高能电子动力学的影响,强调了它们对磁层过程和动力学的潜在重要贡献。
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来源期刊
Geophysical Research Letters
Geophysical Research Letters 地学-地球科学综合
CiteScore
9.00
自引率
9.60%
发文量
1588
审稿时长
2.2 months
期刊介绍: Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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