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Saturation Characteristics of Parallel EMIC Waves in the Inner Magnetosphere
Author(s) -
Yu Xiongdong,
Yuan Zhigang
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl083630
Subject(s) - magnetosphere , cyclotron , physics , computational physics , geophysics , saturation (graph theory) , ion , van allen probes , ring current , electromagnetic radiation , ion cyclotron resonance , atomic physics , magnetic field , van allen radiation belt , optics , mathematics , combinatorics , quantum mechanics
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.