In Situ Observations of Whistler‐Mode Chorus Waves Guided by Density Ducts
In Situ Observations of Whistler‐Mode Chorus Waves Guided by Density Ducts
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DOI：
10.1029/2020ja028814
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
Rui Chen;Xinliang Gao;Q. Lu;Lunjin Chen;B. Tsurutani;Wen Li;B. Ni;Shui Wang
中科院分区：
文献类型：
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作者：
Rui Chen;Xinliang Gao;Q. Lu;Lunjin Chen;B. Tsurutani;Wen Li;B. Ni;Shui Wang
在本文中，我们报告的存在密度管道在地球的磁层通过研究哨声模式合唱波使用美国宇航局的货车艾伦探测器A数据的现场观测的证据。在近赤道区域处，最初在具有小于Gendrin角的波法向角（WNA）的密度管道内部激发的合唱波被有效地限制在密度管道内部的有限区域（即，导管区域），并保持小WNA，因为他们向高纬度地区传播。对于较高频率的波，管道区域变得更窄。WNA大于Gendrin角的合唱波不被密度管道引导。我们的研究表明，密度管道可以有效地控制合唱波的性质和分布，并可能最终调节地球或其他行星辐射带的电子动力学。
In this paper, we report the proof of the existence of density ducts in the Earth's magnetosphere by studying in situ observations of whistler‐mode chorus waves using NASA's Van Allen Probe‐A data. Chorus waves, originally excited inside the density ducts with wave normal angles (WNAs) smaller than the Gendrin angle at the near‐equatorial region, are efficiently confined to a limited area inside density ducts (i.e., ducted regions), and remain with small WNAs as they propagate toward higher latitudes. The ducted region becomes narrower for the higher‐frequency waves. Chorus waves with WNAs larger than the Gendrin angle are not guided by density ducts. Our study reveals that density ducts can effectively control the property and distribution of chorus waves, and may ultimately regulate electron dynamics in the Earth's or other planetary radiation belts.