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Saturation Characteristics of Parallel EMIC Waves in the Inner Magnetosphere


AuthorYu, Xiongdong; Yuan, Zhigang;
KeywordsAnisotropy-beta inverse relation; EMIC waves; Quasilinear theory; RC ions; Van Allen Probes
AbstractIn 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.
Year of Publication2019
JournalGeophysical Research Letters
Volume
Number of Pages
Section
Date Published07/2019
ISBN
URLhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019GL083630
DOI10.1029/2019GL083630