Laboratory studies of nonlinear whistler wave processes in the Van Allen radiation belts

TitleLaboratory studies of nonlinear whistler wave processes in the Van Allen radiation belts
Publication TypeJournal Article
Year of Publication2015
AuthorsTejero, EM, Crabtree, C, Blackwell, DD, Amatucci, WE, Mithaiwala, M, Ganguli, G, Rudakov, L
JournalPhysics of Plasmas
Volume22
Start Page091503
Issue9
Date Published08/2015
KeywordsElectrostatic Waves; magnetic fields; Nonlinear scattering; Plasma electromagnetic waves; Whistler waves
AbstractImportant nonlinear wave-wave and wave-particle interactions that occur in the Earth’s Van Allen radiation belts are investigated in a laboratory experiment. Predominantly electrostatic waves in the whistler branch are launched that propagate near the resonance cone with measured wave normal angle greater than 85º. When the pump amplitude exceeds a threshold ~5 x10^6 times the back- ground magnetic field, wave power at frequencies below the pump frequency is observed at wave normal angles (~55º). The scattered wave has a perpendicular wavelength that is nearly an order of magnitude larger than that of the pump wave. Occasionally, the parametric decay of a lower hybrid wave into a magnetosonic wave and a whistler wave is simultaneously observed with a threshold of δB=B_0 ~7 x 10^-7 .
URLhttp://scitation.aip.org/content/aip/journal/pop/22/9/10.1063/1.4928944
DOI10.1063/1.4928944


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