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Li, Jing-Huan; Yang, Fan; Zhou, Xu-Zhi; Zong, Qiu-Gang; Artemyev, Anton V.; Rankin, Robert; Shi, Quanqi; Yao, Shutao; Liu, Han; He, Jiansen; Pu, Zuyin; Xiao, Chijie; Liu, Ji; Pollock, Craig; Le, Guan; Burch, James L.
Nature communications, 11/2020, Volume: 11, Issue: 1Journal Article
Abstract NASA’s Magnetospheric Multi-Scale (MMS) mission is designed to explore the proton- and electron-gyroscale kinetics of plasma turbulence where the bulk of particle acceleration and heating takes place. Understanding the nature of cross-scale structures ubiquitous as magnetic cavities is important to assess the energy partition, cascade and conversion in the plasma universe. Here, we present theoretical insight into magnetic cavities by deriving a self-consistent, kinetic theory of these coherent structures. By taking advantage of the multipoint measurements from the MMS constellation, we demonstrate that our kinetic model can utilize magnetic cavity observations by one MMS spacecraft to predict measurements from a second/third spacecraft. The methodology of “observe and predict” validates the theory we have derived, and confirms that nested magnetic cavities are self-organized plasma structures supported by trapped proton and electron populations in analogous to the classical theta-pinches in laboratory plasmas.
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