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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Correlated Pc4–5 ULF waves, whistler-mode chorus, and pulsating aurora observed by the Van Allen Probes and ground-based systems
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Correlated Pc4–5 ULF waves, whistler-mode chorus, and pulsating aurora observed by the Van Allen Probes and ground-based systems

机译:相关Pc4-5 ULF波,whistler-mode合唱,范-艾伦和脉动极光观测探测和地面系统

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Theory and observations have linked equatorial VLF waves with pulsating aurora for decades, invoking the process of pitch angle scattering of tens of keV electrons in the equatorial magnetosphere. Recently published satellite studies have strengthened this argument, by showing strong correlation between pulsating auroral patches and both lower-band chorus and tens of keV electron modulation in the vicinity of geosynchronous orbit. Additionally, a previous link has been made between Pc4–5 compressional pulsations and modulation of whistler-mode chorus using Time History of Events and Macroscale Interactions during Substorms. In the current study, we present simultaneous in situ observations of structured chorus waves and an apparent field line resonance (in the Pc4–5 range) as a result of a substorm injection, observed by Van Allen Probes, along with ground-based observations of pulsating aurora. We demonstrate the likely scenario being one of substorm-driven Pc4–5 ULF pulsations modulating chorus waves, and thus providing the driver for pulsating particle precipitation into the Earth's atmosphere. Interestingly, the modulated chorus wave and ULF wave periods are well correlated, with chorus occurring at half the periodicity of the ULF waves. We also show, for the first time, a particular few-Hz modulation of individual chorus elements that coincides with the same modulation in a nearby pulsating aurora patch. Such modulation has been noticed as a high-frequency component in ground-based camera data of pulsating aurora for decades and may be a result of nonlinear chorus wave interactions in the equatorial region.
机译:理论和观察赤道甚低频有关波与脉动极光几十年来,调用的投掷角扩散的过程凯文电子在赤道磁气圈。最近出版的卫星的研究加强了这一观点,通过展示强劲极光补丁和脉动之间的相关性lower-band合唱和数万keV电子调制附近的同步轨道。之间Pc4-5压缩脉冲使用时间调制的whistler-mode合唱的历史事件和宏观尺度相互作用在亚暴的。同时原位观测结构化的合唱波和一个明显的字段行共振(Pc4-5范围内)亚暴的注入,观察到范-艾伦探测和地面观测脉动极光。场景之一substorm-driven Pc4-5 ULF脉冲调制合唱波,因此提供司机脉动粒子降水进入地球大气层。有趣的是,调制合唱和ULF浪潮波周期相关,与合唱发生周期性的ULF的一半波。特殊的个人合唱few-Hz调制元素的同时,相同的调制在附近的脉动极光补丁。作为一个高频调制已经注意到在地面相机数据的组件脉动极光几十年,可能是一个结果非线性合唱波相互作用的赤道地区。

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