Saturation Characteristics of Parallel EMIC Waves in the Inner Magnetosphere

Saturation Characteristics of Parallel EMIC Waves in the Inner Magnetosphere
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内磁层平行EMIC波的饱和特性

DOI:
10.1029/2019gl083630
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发表时间:
2019-07
影响因子:
5.2
通讯作者:
Yuan Zhigang
Yuan Zhigang
中科院分区:
地球科学1区
文献类型:
--
作者:
Yu Xiongdong;Yuan Zhigang

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本文用准线性理论研究了内磁层中平行电磁离子回旋波的详细演化过程。在通常的第一次饱和之后,发现出现了一个新的饱和。在这两个饱和之间的时间间隔内,能量从H+带转移到He+带电磁离子回旋波。此外,通过最佳拟合,我们获得了新的模型参数的各向异性β的热H+,它确定了在磁层内的离子回旋不稳定性的阈值的逆关系。现场观测的货车艾伦探测器使命也验证了这些新的模型参数。因此,我们的结果揭示了内磁层平行电磁离子回旋波的演化过程和饱和特性。
In this letter, detailed evolution process of parallel electromagnetic ion cyclotron waves in the inner magnetosphere has been investigated through quasilinear theory. A new saturation has been found to occur after the usual first saturation. During the interval between these two saturations, the energy transfers from H+ band to He+ band electromagnetic ion cyclotron waves. Moreover, through a best fitting, we obtain new model parameters for the anisotropy‐beta inverse relation of hot H+, which identifies the threshold of ion cyclotron instabilities in the inner magnetosphere. In situ observations of the Van Allen Probe mission also verify these new model parameters. Therefore, our results reveal the evolution process and saturation characteristics of parallel electromagnetic ion cyclotron waves in the inner magnetosphere.
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