Dependency of Plasma Emission on Plasma-to-Cyclotron Frequency Ratio: Particle-In-Cell Simulation
Abstract
The study on the plasma emission is conducted through the Particle-In-Cell (PIC) and weak turbulence simulation methods. The solar flares generate electron beam in the solar wind and it excites the electron beam instability as well as the Langmuir decay instability, which is the mechanism for solar type II and type III radio burst phenomena. First, we compared the results of the complete set of equations of WT theory and the 2-dimensiontal PIC simulation for the unmagnetized plasma for the first time. It is found that the weak turbulence theory is largely valid, although some discrepancies are also found. Then we also analyzed the plasma emission in the magnetized plasmas. The previous study on the plasma emissions are researched in the unmagnetized plasma. However, the magnetic field near the sun is strong enough that the plasma to cyclotron frequency ratio (wpe/wce) ranges up to ~3 according to Parker model. Therefore, we also conducted a simulation study on the plasma emissions in the magnetized plasma. The wave properties of the Langmuir waves and plasma emissions in strongly magnetized plasmas are different from those in unmagnetized plasmas. The waves in the strongly magnetized plasmas are limited to short perpendicular wavenumber.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMSH53B3364L
- Keywords:
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- 2164 Solar wind plasma;
- INTERPLANETARY PHYSICS;
- 2169 Solar wind sources;
- INTERPLANETARY PHYSICS;
- 7509 Corona;
- SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMY;
- 7863 Turbulence;
- SPACE PLASMA PHYSICS