| Autor: |
Zhang, Shuai, Rae, I. Jonathan, Watt, Clare E. J., Degeling, Alexander W., Tian, Anmin, Shi, Quanqi, Shen, Xiao‐Chen, Yao, Shutao, Guo, Ruilong, Wang, Mengmeng, Zhu, Xiaoqiong, Wang, Huizi |
| Předmět: |
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| Zdroj: |
Journal of Geophysical Research. Space Physics; Nov2021, Vol. 126 Issue 11, p1-13, 13p |
| Abstrakt: |
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. Key Points: Chorus waves tend to be incoherent when the spatial extent is greater than 433 km or the time lag lasts 10 s at <∼6.5The spatial scale size of chorus wave is relatively larger near noon or with lower geomagnetic activityThe temporal scale size of chorus wave is always statistically near zero, not influenced by L‐shell, magnetic local time, or AL* index [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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