Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 44, Issue 11, Pages 5269-5275Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL073829
Keywords
resonant interaction; whistler mode waves; upper band chorus; wave-wave coupling; nonlinear process
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Funding
- NSFC [41604128, 41631071, 41331067, 41474125]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2016395]
- Key Research Program of Frontier Sciences, CAS [QYZDJ-SSW-DQC010]
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Nonlinear physics related to whistler mode waves in the Earth's magnetosphere are now becoming a hot topic. In this letter, based on Time History of Events and Macroscale Interactions during Substorms waveform data, we report several interesting whistler mode wave events, where the upper band whistler mode waves are believed to be generated through the nonlinear wave-wave coupling between two lower band waves. This is the first report on resonant interactions between whistler mode waves in the Earth's magnetosphere. In these events, the two lower band whistler mode waves are observed to have oppositely propagating directions, while the generated upper band wave has the same propagating direction as the lower band wave with the relatively higher frequency. Moreover, the wave normal angle of the excited upper band wave is usually larger than those of two lower band whistler mode waves. Our results reveal the large diversity of the evolution of whistler mode waves in the Earth's magnetosphere.
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