Abstract
We study a novel nonlinear mechanism which could be responsible for the generation of the non-thermal continuum radiation. We propose a mathematical model and perform numerical simulations using 2-D electromagnetic code KEMPO2 to verify the proposed mechanism. In the simulation domain, we have density gradient and ring beam electrons in the dense region as a source of electrostatic (ES) waves through ring-beam instability. These ES waves cause non-gyrotropy of the ring velocity distribution which is necessary for the generation of the harmonic waves. Velocity component vy together with magnetic field Bz of generated Z-mode waves creates Lorentz force in the x-direction (along the magnetic field). Hence, oscillating electrons emit O-mode waves to the low density area.
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