Intense chorus waves are the cause of flux-limiting in the heart of the outer radiation belt.

Intense chorus waves are the cause of flux-limiting in the heart of the outer radiation belt.
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DOI:
10.1038/s41598-022-26189-9
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发表时间:
2022-12-15
期刊:
影响因子:
4.6
通讯作者:
--
中科院分区:
综合性期刊3区
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--
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通过回旋共振,合唱波在外范艾伦电子带动力学中起着关键作用。在这里,我们使用范艾伦探测器的数据来揭示在地磁风暴的主要阶段在辐射带中心激发的一个新的和独特的强烈合唱波群体。这些波的能量通常比风暴前的水平大2-3个数量级,当~10-100keV的电子通量接近或超过Kennel-Petschek极限时产生。这些强烈的和声波迅速将电子散射到损耗锥中,将电子通量限制在接近50年前Kennel和Petschek预测的极限值。我们的结果对于理解辐射带通量的极限是至关重要的,准确的模型可能需要包括这种合唱波驱动的通量限制过程,这与负责增强通量的加速机制或源无关。
Chorus waves play a key role in outer Van Allen electron belt dynamics through cyclotron resonance. Here, we use Van Allen Probes data to reveal a new and distinct population of intense chorus waves excited in the heart of the radiation belt during the main phase of geomagnetic storms. The power of the waves is typically ~ 2–3 orders of magnitude greater than pre-storm levels, and are generated when fluxes of ~ 10–100 keV electrons approach or exceed the Kennel–Petschek limit. These intense chorus waves rapidly scatter electrons into the loss cone, capping the electron flux to a value close to the limit predicted by Kennel and Petschek over 50 years ago. Our results are crucial for understanding the limits to radiation belt fluxes, with accurate models likely requiring the inclusion of this chorus wave-driven flux-limiting process, that is independent of the acceleration mechanism or source responsible for enhancing the flux.
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