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Magnetic reconnection in solar flares can efficiently generate non-thermalelectron beams. The energetic electrons can, in turn, cause radio waves throughmicroscopic plasma instabilities as they propagate through the ambient plasmaalong the magnetic field lines. We aim at investigating the wave emissioncaused by fast moving electron beams (FEBs) with characteristic non-thermalelectron velocity distribution functions (EVDFs) generated by kinetic magneticreconnection: two-streaming EVDFs along the separatrices and in the diffusionregion, and perpendicular crescent-shaped EVDFs closer to the diffusion region.For this purpose, we utilized 2.5D fully kinetic Particle-In-Cell (PIC) codesimulations in this study. We found that:(1) the two-streaming EVDFs plus thebackground ions are unstable to electron/ion (streaming) instabilities whichcause ion acoustic waves and Langmuir waves due to the net current. This canlead to multiple harmonic plasma emission in the diffusion region and theseparatrices of reconnection. (2) The perpendicular crescent-shaped EVDFs cancause multiple harmonic electromagnetic electron cyclotron waves through theelectron cyclotron maser instabilities in the diffusion region of reconnection.Our results are applicable to diagnose the plasma parameters which controlmagnetic reconnection in solar flares by means of radio waves observations.

Wave emission of non-thermal electron beams generated by magnetic reconnection