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Nonlinear Landau resonant interaction between kinetic Alfv\'en waves and thermal electrons: Excitation of time domain structures by An, Xin; Bortnik, Jacob; Zhang, Xiaojia is a scholarly article available to read on EtoBox.

What is Nonlinear Landau resonant interaction between kinetic Alfv\'en waves and thermal electrons: Excitation of time domain structures about?

Phase space holes, double layers and other solitary electric field structures, referred to as time domain structures (TDSs), often occur around dipolarization fronts in the Earth's inner magnetosphere. They are considered to be important because of their role in the dissipation of the injection energy and their potential for significant particle scattering and acceleration. Kinetic Alfv\'en waves are observed to be excited during energetic particle injections, and are typically present in conjunction with TDS observations. Despite the availability of a large number of spacecraft observations, the origin of TDSs and their relation to kinetic Alfv\'en waves remains poorly understood to date. Part of the difficulty arises from the vast scale separations between kinetic Alfv\'en waves and TDSs. Here, we demonstrate that TDSs can be excited by electrons in nonlinear Landau resonance with kinetic Alfv\'en waves. These electrons get trapped by the parallel electric field of kinetic Alfv\'en waves, form localized beam distributions, and subsequently generate TDSs through beam instabilities. A big picture emerges as follows: macroscale dipolarization fronts first transfer the ion flow (kine

Author

An, Xin; Bortnik, Jacob; Zhang, Xiaojia

Published

2020

Language

EN