PIC Simulation of Double Plasma Resonance and Zebra Pattern of Solar Radio Bursts

Abstract

Latest study reports that plasma emission can be generated by energetic electrons of DGH distribution via the electron cyclotron maser instability (ECMI) in plasmas characterized by a large ratio of plasma oscillation frequency to electron gyro-frequency (${\omega }_{pe}/{\Omega }_{ce}$). In this study, on the basis of the ECMI-plasma emission mechanism, we examine the double plasma resonance (DPR) effect and the corresponding plasma emission at both harmonic (H) and fundamental (F) bands using PIC simulations with various ${\omega }_{pe}/{\Omega }_{ce}$. This allows us to directly simulate the feature of zebra pattern (ZP) observed in solar radio bursts for the first time. We find that (1) the simulations reproduce the DPR effect nicely for the upper hybrid (UH) and Z modes, as seen from their variation of intensity and linear growth rate with ${\omega }_{pe}/{\Omega }_{ce}$, (2) the intensity of the H emission is stronger than that of the F emission by $\sim$ 2 orders of magnitude and vary periodically with increasing ${\omega }_{pe}/{\Omega }_{ce}$, while the F emission is too weak to be significant, therefore we suggest that it is the H emission accounting for solar ZPs, (3) the peak-valley contrast of the total intensity of H is $\sim 4$, and the peak lies around integer values of ${\omega }_{pe}/{\Omega }_{ce}$ (= 10 and 11) for the present parameter setup. We also evaluate the effect of energy of energetic electrons on the characteristics of ECMI-excited waves and plasma radiation. The study provides novel insight on the physical origin of ZPs of solar radio bursts.

References in corpus (4)

• An Eruptive Hot-Channel Structure Observed at Metric Wavelength as a Moving Type-IV Solar Radio Burst
• Temperature dependent growth rates of the upper-hybrid waves and solar radio zebra patterns
• A Very Small and Super Strong Zebra Pattern Burst at the Beginning of a Solar Flare
• Polarization Characteristics of Zebra Patterns in Type IV Solar Radio Bursts

Cited by in corpus (9)

• Plasma Emission Induced By Electron Beam in Weakly Magnetized Plasmas
• Simulation of plasma emission in magnetized plasmas
• An alternative form of the fundamental plasma emission through the coalescence of Z-mode waves with whistlers
• Verification of the standard theory of plasma emission with particle-in-cell simulations
• Harmonic maser emissions from electrons with loss-cone distribution in solar active regions
• Plasma emission induced by ring-distributed energetic electrons in overdense plasmas
• Particle-in-cell simulations of electron-positron cyclotron maser forming pulsar radio zebras
• Zebra stripes with high gyro-harmonic numbers
• Imaging Preflare Broadband Pulsations in the Decimetric-metric Wavelengths