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


AuthorTejero, E.; Crabtree, C.; Blackwell, D.; Amatucci, W.; Mithaiwala, M.; Ganguli, G.; Rudakov, L.;
KeywordsNonlinear waves; Van Allen Belts
AbstractImportant nonlinear wave-wave and wave-particle interactions that occur in the Earth\textquoterights 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 85\textdegree . When the pump amplitude exceeds a threshold \~5\texttimes10-6 times the background magnetic field, wave power at frequencies below the pump frequency is observed at wave normal angles (\~55\textdegree) . 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/B0\~7\texttimes10-7 .
Year of Publication2015
JournalPhysics of Plasmas
Volume22
Number of Pages091503
Section
Date Published09/2015
ISBN
URLhttp://scitation.aip.org/content/aip/journal/pop/22/9/10.1063/1.4928944
DOI10.1063/1.4928944