On the Driver of Daytime Pc3 Auroral Pulsations

On the Driver of Daytime Pc3 Auroral Pulsations
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论白天 Pc3 极光脉动的驱动因素

DOI:
10.1029/2018gl080842
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发表时间:
2019
影响因子:
5.2
通讯作者:
Weatherwax, A. T.
Weatherwax, A. T.
中科院分区:
地球科学1区
文献类型:
--
作者:
Motoba, T.;Ebihara, Y.;Ogawa, Y.;Kadokura, A.;Engebretson, M. J.;Angelopoulos, V.;Gerrard, A. J.;Weatherwax, A. T.

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Pc3范围频率(22-100 mHz)的极光脉动通常发生在白天的高纬度地区,赤道的尖端/裂缝,通常映射到白天的外磁层。本文报道了在南极站(- 74.4°磁纬),同时观测到与白天Pc3极光脉动直接相关的日侧外磁层压缩Pc3磁脉动。两个位置的脉动几乎相同,当磁层脉动高度单色时,它们的相关性最为明显。较低波段的合唱波和keV电子通量也在Pc3范围内被调制,可能是由压缩磁脉动引起的。磁层和极光中常见的Pc3频率与上游超低频波的预测频率吻合较好。这些结果提供了第一个令人信服的证据,证明在上游产生的压缩Pc3波、合唱波和keV电子的Pc3范围调制以及Pc3极光脉动之间存在直接的日侧外磁层-电离层联系。
Pc3 range frequency (22–100 mHz) auroral pulsations often occur at daytime high latitudes, equatorward of the cusp/cleft and typically map to the dayside outer magnetosphere. In this paper we present simultaneous observations of compressional Pc3 magnetic pulsations in the dayside outer magnetosphere that occurred in direct association with daytime Pc3 auroral pulsations at South Pole Station (−74.4° magnetic latitude). The pulsations were almost identical at the two locations, and their correlation was clearest when the magnetospheric pulsations were highly monochromatic. Lower‐band chorus waves and keV electron fluxes were also modulated in the Pc3 range, likely by the compressional magnetic pulsations. The common Pc3 frequency in the magnetosphere and aurora matched well with the predicted frequency of upstream ultralow frequency waves. These results provide the first compelling evidence for the direct dayside outer magnetosphere‐ionosphere linkage between upstream‐generated compressional Pc3 waves, Pc3 range modulations of chorus waves and keV electrons, and Pc3 auroral pulsations.
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