Determining the global scale size of chorus waves in the magnetosphere

Zhang, Shuai, Rae, Jonathan, Watt, Clare, Degeling, Alexander W., Tian, Anmin, Shi, Quanqi, Shen, Xiao‐Chen, Yao, Shutao, Guo, Ruilong, Wang, Mengmeng and Zhu, Xiaoqiong (2021) Determining the global scale size of chorus waves in the magnetosphere. Journal of Geophysical Research: Space Physics, 126 (11). e2021JA029569. ISSN 2169-9380

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Chorus waves outside the plasmapause influence the Earth's radiation belt dynamics by interacting with energetic electrons via cyclotron and Landau resonance. Recent numerical diffusion experiments indicate that the diffusion process is sensitive to the spatial and temporal scale of variability in the wave-particle interaction, which is reported to be more efficient than that based on the traditional average model. Using Van Allen Probes A and B data from November 2012 to July 2019, the spatial and temporal scale size of chorus waves are calculated by the correlation between the wave amplitudes detected by two satellites with varying spatial separation or time lag. We found that, the chorus wave is incoherent when the spatial extent is greater than 433 km or the time lag lasts ∼10 s, which are significantly smaller than that of plasmaspheric hiss. In addition, the spatial correlations of chorus tend to be higher near noon or with lower geomagnetic activity. The temporal correlations of chorus are always statistically near zero, which are not influenced by the location and geomagnetic activity. Our results can help refine the model of the interactions between energetic particles and chorus waves in the radiation belt.

Item Type: Article
Additional Information: Funding information: This work was funded by the National Natural Science Foundation of China (Grants 41961130382, 41974189, and 41731068), the Royal Society Newton Advanced Fellowship (NAF/R1/191047), and the Shandong University (Weihai) Future Plan for Young Scholars (2017WHWLJH08). I. J. Rae was funded by the Natural Environment Research Council (NE/V002724/1, NE/V002554/1, NE/P017185/1, and NE/P017150/1) and the Science and Technology Facilities Council (ST/V006320/1). C. E. J. Watt was funded by the NERC (grant NE/P017274) and the STFC (grant ST/R000921/1). X.-C. Shen was funded by the NASA (grants 80NSSC20K0698, 80NSSC20K0557, NNX17AD15G, and 80NSSC20K1270).
Subjects: F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 12 Nov 2021 09:56
Last Modified: 03 May 2022 03:30

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