Recently detected coherent low-frequency radio emission from M dwarf systems shares phenomenological similarities with produced by magnetospheric processes the gas giant planets of our Solar System. Such beamed electron-cyclotron maser can be driven a star-planet interaction or breakdown in co-rotation between rotating plasma disk and stellar magnetosphere. Both models suggest that could period...

Type IIIb radio bursts were identified as a chain of quasi-periodic striae in dynamic spectra, drifting from high to low frequencies manner similar type III bursts, which fine structures may provide clue better understanding emission mechanisms. The approaching observation the Parker Solar Probe (PSP) spacecraft provides new chance probing vicinity Sun. In this Letter, combining situ measuremen...

In this work, we search for the presence of chaos in a self-consistent model for the cyclotronresonance maser accelerator. Two characteristic regimes are identified. If the initial action variable of the accelerating particles is small, rapid phase bunching occurs and the particle population is condensed into a single macroparticle in phase space. As a result, this low-dimensional state is pred...

The changes in the spectral line profile of the 22 GHz H 2 O maser are calculated as a function of emerging maser flux. We address not only the narrowing and re-broadening of the maser lines, but also the deviations of Gaussian symmetry as a result of the various hyperfine components of the 22 GHz maser line. Non-LTE models of the H 2 O maser transition, including hyperfine structure and cross-...

Water maser polarization observations in the precessing jet of W43A have revealed that it is magnetically collimated. Here we present a detailed description of the physical properties of the water maser environment in the jet. We discuss the maser saturation level and beaming angle as well as the intrinsic temperatures and densities. Additionally, we show that the polarization angle of the stro...

Abstract Electron cyclotron maser emission (ECME) is regarded as a plausible source for coherent radio radiations from solar active regions (e.g., spikes). In this Letter, we present 2D3V fully kinetic electromagnetic particle-in-cell simulation to investigate the wave excitations and subsequent nonlinear processes induced by energetic electrons in loss-cone distribution. The ratio of plasma fr...

Magnetic reconnection in solar flares can efficiently generate non-thermal electron beams. The energetic electrons can, turn, cause radio waves through microscopic plasma instabilities as they propagate the ambient along magnetic field lines. We aim at investigating wave emission caused by fast moving beams (FEBs) with characteristic velocity distribution functions (EVDFs) generated kinetic rec...