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Electrostatic and whistler instabilities excited by an electron beam

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4986511· OSTI ID:1474311
 [1];  [2];  [3];  [3];  [2]
  1. Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences; University of California, Los Angeles
  2. Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences
  3. Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy

The electron beam-plasma system is ubiquitous in the space plasma environment. Here in this paper, using a Darwin particle-in-cell method, the excitation of electrostatic and whistler instabilities by a gyrating electron beam is studied in support of recent laboratory experiments. It is assumed that the total plasma frequency (ωpe) is larger than the electron cyclotron frequency (Ωe). The fast-growing electrostatic beam-mode waves saturate in a few plasma oscillations by slowing down and relaxing the electron beam parallel to the background magnetic field. Upon their saturation, the finite amplitude electrostatic beam-mode waves can resonate with the tail of the background thermal electrons and accelerate them to the beam parallel velocity. The slower-growing whistler waves are excited in primarily two resonance modes: (a) through Landau resonance due to the inverted slope of the beam electrons in the parallel velocity and (b) through cyclotron resonance by scattering electrons to both lower pitch angles and smaller energies. It is demonstrated that, for a field-aligned beam, the whistler instability can be suppressed by the electrostatic instability due to a faster energy transfer rate between the beam electrons and electrostatic waves. Such a competition of growth between whistler and electrostatic waves depends on the ratio of ωpee. In terms of wave propagation, beam-generated electrostatic waves are confined to the beam region, whereas beam-generated whistler waves transport energy away from the beam.

Research Organization:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0010578
OSTI ID:
1474311
Alternate ID(s):
OSTI ID: 1371492
Journal Information:
Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 24; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

Whistler instability stimulated by the suprathermal electrons present in space plasmas journal October 2019
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
Origin of two-band chorus in the radiation belt of Earth journal October 2019
Linear unstable whistler eigenmodes excited by a finite electron beam journal August 2019
Linear unstable whistler eigenmodes excited by a finite electron beam text January 2019
Whistler instability stimulated by the suprathermal electrons present in space plasmas text January 2019

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