Journal
PHYSICS OF PLASMAS
Volume 25, Issue 2, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.5007907
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Funding
- National Science Foundation through ASSURE program [NSF: AGS-161277]
- JHU/APL [922613]
- NASA [NNX16AF85G]
- NASA [905457, NNX16AF85G] Funding Source: Federal RePORTER
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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. Published by AIP Publishing.
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