Using a two-dimensional electromagnetic and relativistic particle-in-cell (PIC) code, we show that high-frequency electromagnetic waves can be emitted by the plasma maser from Langmuir waves generated by cold electron beam instability in pair plasmas. It is confirmed that the presence of a magnetic field is essential for the plasma maser mechanism.

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The generation of R-mode electromagnetic waves from whistler turbulence by plasma maser effect is studied both numerically and theoretically. Simulations using a two-dimensional electromagnetic and relativistic particle code show that high frequency electromagnetic waves with right-handed polarization ͑R-mode͒ can be generated by a plasma maser mechanism from low frequency whistler waves excited by electron temperature anisotropy. Results obtained theoretically are in good agreement with numerical findings.

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