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Title: Resonant excitation of whistler waves by a helical electron beam

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.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Univ. of Texas at Dallas, Richardson, TX (United States)
Publication Date:
Grant/Contract Number:
SC0010578
Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 43; Journal Issue: 6; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Research Org:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; whistler wave; electron beam; wave excitation
OSTI Identifier:
1467653
Alternate Identifier(s):
OSTI ID: 1402230