On the Origin of Ionospheric Hiss: A Conjugate Observation

On the Origin of Ionospheric Hiss: A Conjugate Observation
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关于电离层嘶声的起源:共轭观测

DOI:
10.1002/2017ja024803
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发表时间:
2017-11
期刊:
Journal of Geophysical Research: Space Physics
影响因子:
--
通讯作者:
Chen lunjin
Chen lunjin
中科院分区:
其他
文献类型:
--
作者:
Zeren Zhima;Chen lunjin

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我们提出了来自低地球轨道卫星“地震地区电磁发射探测”(DEMETER)和高空椭圆轨道航天器“次暴期间事件时间史和宏观尺度相互作用”(THEMIS)对哨声模式电磁嘶嘶声的共轭观测。共轭观测是在 2010 年 6 月 15 日世界标准时间 14:51:10 至 15:12:00 进行的,当时 DEMETER 从约 1.39 至 2.80 高度飞越 L 壳区,高度约 660 公里;与此同时,THEMIS 探测器在约 1.6 至 2.0 RE 的高度上穿过约 1.64 至 1.91 的 L 壳区域。共轭观测结果表明,DEMETER 捕获的电离层嘶嘶声(约 350 至 800 Hz)与 THEMIS 探测器记录的等离子层嘶嘶声(约 350 至 900 Hz)之间具有相似的时频结构,包括相似的峰值频率(约 500 至 600 Hz)、相似的下限截止频率(约 350 至 400 Hz)和上限截止频率(约 730 至 800 Hz)。波矢量分析表明,电离层嘶嘶声倾斜向下传播到地球,并稍微向赤道方向传播,具有右旋极化,表明其来源来自更高的海拔。在观测约束下的射线追踪模拟验证了电离层和等离子层嘶嘶声之间的联系在物理上可以通过波传播实现。这项研究提供了直接的观测证据,支持高空等离子层嘶嘶声导致低空电离层嘶嘶声产生的机制。
We present a conjugate observation on whistler mode electromagnetic hiss from the low Earth orbit satellite Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) and the high-altitude elliptical orbit spacecraft Time History of Events and Macroscale Interactions during Substorms (THEMIS). The conjugate observation was performed at 14:51:10 to 15:12:00 UT on 15 June 2010, when DEMETER was flying across the L shell region from ~1.39 to 2.80 at an altitude of ~660 km; meanwhile, THEMIS probes were passing through the L shell region from ~1.64 to 1.91 at altitudes from ~1.6 to 2.0 RE. The conjugated observations demonstrate similar time-frequency structures between the ionospheric hiss (~350 to 800 Hz) captured by DEMETER and the plasmaspheric hiss (~350 to 900 Hz) recorded by THEMIS probes, including similar peak frequencies (~500 to 600 Hz), similar lower cutoff frequencies (~350 to 400 Hz), and upper cutoff frequencies (~730 to 800 Hz). The wave vector analyses show that the ionospheric hiss propagates obliquely downward to the Earth and slightly equatorward with right-handed polarization, suggesting that its source comes from higher altitudes. Ray tracing simulations with the constraint of observations verify that the connection between ionospheric and plasmaspheric hiss is physically possible through wave propagation. This study provides direct observational evidence to support the mechanism that high-altitude plasmaspheric hiss is responsible for the generation of low-altitude ionospheric hiss.
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