Zakharov simulations of nonlinear wave collapse in continuously driven two-dimensional, electromagnetic strong plasma turbulence with electron thermal speeds v⩾0.01c show that for v≲0.1c, dipole radiation occurs near the plasma frequency, mainly near arrest, but for v≳0.1c, a new mechanism applies in which energy oscillates between trapped Langmuir and transverse modes until collapse is arrested, after which trapped transverse waves are advected into incoherent interpacket turbulence by an expanding annular density well, where they detrap. The multipole structure, Poynting flux, source current, and radiation angular momentum are computed.
Jenet, F. A., et al. “Fundamental Emission via Wave Advection from a Collapsing Wave Packet in Electromagnetic Strong Plasma Turbulence.” Physics of Plasmas, vol. 14, no. 10, American Institute of Physics, Oct. 2007, p. 100702, doi:10.1063/1.2787500.
Physics of Plasmas