Laboratory Investigation of Nonlinear Sub-cyclotron Damping

Erik M. Tejero; C. Lon Enloe; James W. R. Schroeder; Chris Crabtree; Fred Skiff; Vijay Harid

doi:10.1109/ICEAA52647.2021.9539771

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Conference proceeding

Laboratory Investigation of Nonlinear Sub-cyclotron Damping

Erik M. Tejero, C. Lon Enloe, James W. R. Schroeder, Chris Crabtree, Fred Skiff and Vijay Harid

2021 International Conference on Electromagnetics in Advanced Applications (ICEAA), pp.402-402

08/09/2021

DOI: 10.1109/ICEAA52647.2021.9539771

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Abstract

A unique feature of whistler chorus wave observations is the power gap at frequencies near half the electron gyrofrequency, which is observed approximately 2/3 of the time. 1 Additionally, some of these observations have multiple power gaps, which are typically oblique chorus waves. 2 A variety of theories have been developed over the decades to explain these power gaps, including excitation by two separate electron populations, 3 damping due to nonlinear wave-particle interactions, 2 , 4 and lower band cascade generating the upper band through coupling between electrostatic and electromagnetic components of lower band waves. 5 Recently, Gao et al . 5 published a statistical survey of the whistler chorus power gap using seven years of chorus observations from THEMIS. The results of the survey are that the theories involving damping due to nonlinear wave-particle interactions are the most consistent with the observations, but that they do not each explain all the observations. This led the authors to conclude that the power gaps may be a result of a combination of mechanisms or may require new mechanisms. We are currently conducting laboratory experiments coupled with numerical simulations to test the theories most consistent with observations: nonlinear Landau damping and nonlinear sub-cyclotron damping.

Couplings

Damping

Electromagnetic scattering

Electromagnetics

Electrostatics

Numerical simulation

Time-frequency analysis

Details

Title: Subtitle: Laboratory Investigation of Nonlinear Sub-cyclotron Damping
Creators: Erik M. Tejero - United States Naval Research Laboratory
C. Lon Enloe - United States Naval Research Laboratory
James W. R. Schroeder - Wheaton College - Illinois
Chris Crabtree - United States Naval Research Laboratory
Fred Skiff - University of Iowa
Vijay Harid - University of Colorado Denver
Resource Type: Conference proceeding
Publication Details: 2021 International Conference on Electromagnetics in Advanced Applications (ICEAA), pp.402-402
Publisher: IEEE
DOI: 10.1109/ICEAA52647.2021.9539771
Language: English
Date published: 08/09/2021
Academic Unit: Physics and Astronomy
Record Identifier: 9984428806802771

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