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Resonant excitation of whistler waves by a helical electron beam

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2015GL067126· OSTI ID:1467653
 [1];  [2];  [2];  [2];  [3];  [2]
  1. Univ. of California, Los Angeles, CA (United States); Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California
  2. Univ. of California, Los Angeles, CA (United States)
  3. Univ. of Texas at Dallas, Richardson, TX (United States)

Chorus-like whistler mode waves that are known to play a fundamental role in driving radiation belt dynamics are excited on the Large Plasma Device by the injection of a helical electron beam into a cold plasma. The mode structure of the excited whistler wave is identified using a phase correlation technique showing that the waves are excited through a combination of Landau resonance, cyclotron resonance, and anomalous cyclotron resonance. The dominant wave mode excited through cyclotron resonance is quasi-parallel propagating, whereas wave modes excited through Landau resonance and anomalous cyclotron resonance propagate at oblique angles that are close to the resonance cone. An analysis of the linear wave growth rates captures the major observations in the experiment. Here, the results have important implications for the generation process of whistler waves in the Earth’s inner magnetosphere.

Research Organization:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0010578
OSTI ID:
1467653
Alternate ID(s):
OSTI ID: 1402230
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 6 Vol. 43; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Unraveling the excitation mechanisms of highly oblique lower band chorus waves: EXCITATION OF OBLIQUE LOWER BAND CHORUS journal September 2016
Oblique Whistler-Mode Waves in the Earth’s Inner Magnetosphere: Energy Distribution, Origins, and Role in Radiation Belt Dynamics journal April 2016
Local Excitation of Whistler Mode Waves and Associated Langmuir Waves at Dayside Reconnection Regions journal September 2018
Whistler Waves Driven by Field‐Aligned Streaming Electrons in the Near‐Earth Magnetotail Reconnection journal May 2019
Linear unstable whistler eigenmodes excited by a finite electron beam journal August 2019
Whistler waves with angular momentum in space and laboratory plasmas and their counterparts in free space journal July 2016
Interpretation of quasi-periodic frequency sweeping in electron cyclotron emission of nonequilibrium mirror-confined plasma sustained by high-power microwaves journal June 2019
Interpretation of quasi-periodic frequency sweeping in electron cyclotron emission of nonequilibrium mirror-confined plasma sustained by high-power microwaves text January 2019
Linear unstable whistler eigenmodes excited by a finite electron beam text January 2019

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