Experimental characterization of nonlinear processes of whistler branch waves

被引：16

作者：

Tejero, E. M. ^{[1
]}

Crabtree, C. ^{[1
]}

Blackwell, D. D. ^{[1
]}

Amatucci, W. E. ^{[1
]}

Ganguli, G. ^{[1
]}

Rudakov, L. ^{[2
]}

机构：

[1] Naval Res Lab, Div Plasma Phys, Washington, DC 20375 USA

[2] Icarus Res Inc, POB 30780, Bethesda, MD 20824 USA

来源：

PHYSICS OF PLASMAS | 2016年 / 23卷 / 05期

基金：

美国国家航空航天局;

关键词：

SCATTERING;

D O I：

10.1063/1.4946020

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Experiments in the Space Physics Simulation Chamber at the Naval Research Laboratory isolated and characterized important nonlinear wave-wave and wave-particle interactions that can occur in the Earth's Van Allen radiation belts by launching predominantly electrostatic waves in the intermediate frequency range with wave normal angle greater than 85 degrees and measuring the nonlinearly generated electromagnetic scattered waves. The scattered waves have a perpendicular wavelength that is nearly an order of magnitude larger than that of the pump wave. Calculations of scattering efficiency from experimental measurements demonstrate that the scattering efficiency is inversely proportional to the damping rate and trends towards unity as the damping rate approaches zero. Signatures of both wave-wave and wave-particle scatterings are also observed in the triggered emission process in which a launched wave resonant with a counter-propagating electron beam generates a large amplitude chirped whistler wave. The possibility of nonlinear scattering or three wave decay as a saturation mechanism for the triggered emission is suggested. The laboratory experiment has inspired the search for scattering signatures in the in situ data of chorus emission in the radiation belts. Published by AIP Publishing.

引用

页数：7

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