title: Nonlinear Generation of Electromagnetic Waves through Induced Scattering by Thermal Plasma.
abstract: We demonstrate the conversion of electrostatic pump waves into electromagnetic waves through nonlinear induced scattering by thermal particles in a laboratory plasma. Electrostatic waves in the whistler branch are launched that propagate near the resonance cone. When the amplitude exceeds a threshold ~5 × 10(-6) times the background magnetic field, wave power is scattered below the pump frequency with wave normal angles (~59°), where the scattered wavelength reaches the limits of the plasma column. The scattered wave has a perpendicular wavelength that is an order of magnitude larger than the pump wave and longer than the electron skin depth. The amplitude threshold, scattered frequency spectrum, and scattered wave normal angles are in good agreement with theory. The results may affect the analysis and interpretation of space observations and lead to a comprehensive understanding of the nature of the Earth's plasma environment.
authors.affiliation: Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375.
authors.forename: E M
authors.initials: EM
authors.lastname: Tejero
authors.affiliation: Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375.
authors.forename: C
authors.initials: C
authors.lastname: Crabtree
authors.affiliation: Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375.
authors.forename: D D
authors.initials: DD
authors.lastname: Blackwell
authors.affiliation: Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375.
authors.forename: W E
authors.initials: WE
authors.lastname: Amatucci
authors.affiliation: Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375.
authors.forename: M
authors.initials: M
authors.lastname: Mithaiwala
authors.affiliation: Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375.
authors.forename: G
authors.initials: G
authors.lastname: Ganguli
authors.affiliation: Icarus Research Inc., P.O. Box 30780, Bethesda, MD 20824.
authors.forename: L
authors.initials: L
authors.lastname: Rudakov