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

Author
Keywords
Abstract
Important 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 Publication
2015
Journal
Physics of Plasmas
Volume
22
Number of Pages
091503
Date Published
09/2015
ISSN Number
1070-664X
URL
http://scitation.aip.org/content/aip/journal/pop/22/9/10.1063/1.4928944
DOI
10.1063/1.4928944