Proton aurora and relativistic electron microbursts scattered by electromagnetic ion cyclotron waves
Proton aurora and relativistic electron microbursts scattered by electromagnetic ion cyclotron waves
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DOI：
10.3389/fspas.2022.975123
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发表时间：
2022-08
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影响因子：
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通讯作者：
M. Shumko;B. Gallardo‐Lacourt;A. Halford;L. Blum;Jun Liang;Y. Miyoshi;K. Hosokawa;E. Donovan;I. Mann;K. Murphy;E. Spanswick;J. Blake;M. Looper;D. Gillies
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文献类型：
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作者：
M. Shumko;B. Gallardo‐Lacourt;A. Halford;L. Blum;Jun Liang;Y. Miyoshi;K. Hosokawa;E. Donovan;I. Mann;K. Murphy;E. Spanswick;J. Blake;M. Looper;D. Gillies
来自地球磁层的带电粒子沉淀导致极光和能量转移到大气中的惊人显示。有些降水是由波粒相互作用引起的。在这项研究中，我们提出了电磁离子回旋波，磁层质子和电子之间的波-粒子相互作用的例子。这种相互作用导致了共同定位的孤立质子极光和相对论性电子微暴。虽然孤立的质子极光被广泛认为是由电磁离子回旋波引起的，但这种独特的观察表明，这些波也可以散射相对论电子微暴。理论上，强亚秒级微下击暴流的产生需要电磁离子回旋波与电子之间的非线性相互作用。最后，对极光发射的详细分析表明，在事件期间没有合唱波。这与最常见的微暴流相关驱动器，哨声模式合唱波相反，并支持其他不太常见的驱动机制。
Charged particle precipitation from Earth’s magnetosphere results in stunning displays of the aurora and energy transfer into the atmosphere. Some of this precipitation is caused by wave-particle interactions. In this study, we present an example of a wave-particle interaction between Electromagnetic Ion Cyclotron waves, and magnetospheric protons and electrons. This interaction resulted in a co-located isolated proton aurora and relativistic electron microbursts. While isolated proton aurora is widely believed to be caused by Electromagnetic Ion Cyclotron waves, this unique observation suggests that these waves can also scatter relativistic electron microbursts. Theoretically, nonlinear interactions between Electromagnetic Ion Cyclotron waves and electrons are necessary to produce the intense sub-second microburst precipitation. Lastly, detailed analysis of the auroral emissions suggests that no chorus waves were present during the event. This is in contrast to the most commonly associated driver of microbursts, whistler mode chorus waves, and supports other less commonly considered driving mechanisms.