Electron-acoustic solitary waves in the Earth's inner magnetosphere

Physics of Plasmas - Tập 25 Số 2 - 2018
C. S. Dillard1,2, I. Y. Vasko3,1, F. S. Mozer1, O. V. Agapitov1, J. W. Bonnell1
1Space Sciences Laboratory, University of California at Berkeley 1 , California 94708, USA
2The Evergreen State College 2 , Olympia, Washington 98505, USA
3Space Research Institute of Russian Academy of Science 3 , Moscow 117997, Russia

Tóm tắt

The broadband electrostatic turbulence observed in the inner magnetosphere is produced by large-amplitude electrostatic solitary waves of generally two types. The solitary waves with symmetric bipolar parallel (magnetic field-aligned) electric field are electron phase space holes. The solitary waves with highly asymmetric bipolar parallel electric field have been recently shown to correspond to the electron-acoustic plasma mode (existing due to two-temperature electron population). Through theoretical and numerical analysis of hydrodynamic and modified Korteweg-de Vries equations, we demonstrate that the asymmetric solitary waves appear due to the steepening of initially quasi-monochromatic electron-acoustic perturbation arrested at some moment by collisionless dissipation (Landau damping). The typical steepening time is found to be from a few to tens of milliseconds. The steepening of the electron-acoustic waves has not been reproduced in self-consistent kinetic simulations yet, and factors controlling the formation of steepened electron-acoustic waves, rather than electron phase space holes, remain unclear.

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Tập 25 Số 2

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