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According to the standard scenario of plasma emission, escaping radiationsare generated by the nonlinear development of the kinetic bump-on-tailinstability driven by a single beam of energetic electrons interacting withplasmas. Here we conduct fully-kinetic electromagnetic particle-in-cellsimulations to investigate plasma emission induced by the ring-distributedenergetic electrons interacting with overdense plasmas. Efficient excitationsof the fundamental (F) and harmonic (H) emissions are revealed with radiationmechanism(s) different from the standard scenario: (1) The primary modesaccounting for the radiations are generated through the electron cyclotronmaser instability (for the upper-hybrid (UH) and Z modes) and the thermalanisotropic instability (for the whistler (W) mode); the F emission isgenerated by the nonlinear coupling of the Z and W modes and the H emission bythe nonlinear coupling of the UH modes. This presents an alternative mechanismof coherent radiation in overdense plasmas.

Plasma emission induced by ring-distributed energetic electrons in overdense plasmas