Harmonic Electron Cyclotron Maser Emission Excited by Energetic Electrons Traveling inside a Coronal Loop

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 millions particles within selected loop reveal integral velocity distribution function (VDF) around certain sections loop, and (3) particle-in-cell (PIC) instabilities driven by energetic electrons initiated obtained distributions. Scattering effects at various levels (weak, moderate, strong) due wave/turbulence-particle interaction are considered using prescribed time scales scattering. It was found that VDFs contain strip-like loss-cone features positive gradient, both capable driving electron cyclotron maser emission (ECME), is viable radiation mechanism for some bursts, particular, spikes. The feature important harmonic X mode, while be fundamental mode. In weak-scattering case, rate energy conversion from X2 reach up ~2.9 * 10^-3 Ek0, where Ek0 initial electrons. demonstrates novel way exciting mode corona during flares, provides new sight into how escaping generated coronal flares.