Abstract Details
Abstracts
Author: Ilya Kuzichev
Requested Type: Poster
Submitted: 2019-03-24 22:20:57
Co-authors: A. R. Soto-Chavez, J. Park, A. Gerrard, A. Spitkovsky
Contact Info:
New Jersey Insitute of Technology
323 Martin Luther King Blvd
Newark, New Jersey 07102
USA
Abstract Text:
Magnetospheric chorus waves are one of the most intense wave phenomena in the Earth’s inner magnetosphere, and they play important role in particle dynamics in the outer radiation belt. These waves are observed as series of quasi-coherent wave-packets with rising or, sometimes, falling frequency. Chorus waves are generated in the equatorial region as a result of whistler instability of the anisotropic electron distribution. Their frequency chirping is generally assumed to be a non-linear phenomenon associated with formation of a non-linear current and corresponding electromagnetic holes or hills. Due to non-linear nature of these waves, the opportunities of their theoretical study are rather limited, and self-consistent numerical simulations are required.
We present the results of simulation of whistler anisotropy instability and chorus generation with the 2D full Particle-in-Cell code TRISTAN-MP. This code models self-consistent dynamics of three particle populations: ions, cold electrons, and hot electrons with anisotropic relativistic Maxwell-Juttner distribution. We have successfully generated chorus waves using TRISTAN-MP code. We have investigated how chorus wave properties depend on background magnetic field inhomogeneity. Our results show that larger inhomogeneity decreases the frequency chirping rate of the chorus waves, and for large enough inhomogeneity, no chirping waves are generated. The chirping rates of the generated chorus elements are in agreement with theoretical predictions. We hope our results will be useful for future modeling and better theoretical understanding of the magnetospheric chorus waves and wave-particle resonant interaction.
The work was supported by NSF grant 1502923 and NASA Van Allen Probes RBSPICE instrument project by JHU/APL Subcontract No. 937836. Computational facilities were NCAR UCAR cluster in Cheyenne, WY, USA, and NJIT Kong cluster at New Jersey Institute of Technology, Newark, NJ, USA.
Comments:
Computer Simulation of Plasmas
