According to the standard scenario of plasma emission, escaping radiations are generated by nonlinear development kinetic bump-on-tail instability driven a single beam energetic electrons interacting with plasmas. Here we conduct fully-kinetic electromagnetic particle-in-cell simulations investigate emission induced ring-distributed overdense Efficient excitations fundamental (F) and harmonic (...

Coherent radio emission from stars can be used to constrain fundamental coronal plasma parameters, such as density and magnetic field strength. It is also a probe of chromospheric magnetospheric acceleration mechanisms. Close stellar binaries, RS Canum Venaticorum (RS CVn) systems, are particularly interesting their heightened level activity possible direct interaction make them unique laborato...

Clear first harmonic emissions of Saturn Kilometric Radiation are discovered during the Cassini Grand Finale orbits. Both ordinary (O) and extraordinary (X) mode fundamental accompanied by X harmonics observed. Analysis shows that frequency ratio between is 2.01 ± 0.08, display weaker intensities than fundamental, 30–40 dB for X-X (fundamental-harmonic) type 10–30 O-X harmonic. The intensity re...

ABSTRACT Fast radio bursts (FRBs) are observed to be highly polarized. Most have high linear polarization but a small fraction shows significant circular polarization. We systematically investigate variety of mechanisms FRBs within the magnetar theoretical framework considering two emission sites inside and outside magnetosphere. For each site, we discuss both intrinsic radiation propagation ef...

A complete understanding of solar radio bursts requires developing numerical techniques which can connect large-scale activities with kinetic plasma processes. As a starting point, this study presents scheme combining three different techniques: (1) extrapolation magnetic field overlying specific active region in order to derive the background field, (2) guiding-center simulation dynamics milli...

The interaction of multiple waveguide modes with a relativistic electron beam in an overmoded, single-frequency, cyclotron autoresonance maser amplifier is analyzed using a nonlinear self-consistent model and kinetic theory. It is shown analytically, and confirmed by simulation, that all of the coupled waveguide modes grow at the spatial growth rate of the dominant unstable mode, but suffer dif...

Gravitational microlensing has revealed an extensive population of “nomadic” planets not orbiting any star, with Jupiter-mass nomads being more populous than main sequence stars. Except for distant objects discovered through microlensing, and hot, young nomads found near star formation regions, to date only a small number of nomad candidates have been discovered. Here I show that there should b...

This paper contains a linear analysis of pulse shapes produced by a spatial and temporal delta-function disturbance of cyclotron-resonance-maser modes for the case where the initial equilibrium state is free of radiation. A pinch-point analysis based on the theory of Briggs and Bers is employed. Numerical and analytical techniques are developed for the straightforward calculation of pinch-point...