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:
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[1]
; [1]
; [1]
; [1]
; [2]
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- Univ. of California, Los Angeles, CA (United States)
- 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
- Free Publicly Accessible Full Text
- Accepted Manuscript (Publisher)
-
Accepted Manuscript (DOE)
- Publisher's Version of Record
- https://doi.org/10.1002/2015GL067126