Determining the global scale size of chorus waves in the magnetosphere

Shuai Zhang*, I. Jonathan Rae, Clare E. J. Watt, Alexander W. Degeling, Anmin Tian, Quanqi Shi, Xiao‐Chen Shen, Shutao Yao, Ruilong Guo, Mengmeng Wang, Xiaoqiong Zhu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article numbere2021JA029569
Number of pages13
JournalJournal of Geophysical Research: Space Physics
Volume126
Issue number11
Early online date3 Nov 2021
DOIs
Publication statusPublished - Nov 2021

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