Resonant excitation of whistler waves by a helical electron beam
Journal Article
·
· Geophysical Research Letters
- Univ. of California, Los Angeles, CA (United States); Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California
- Univ. of California, Los Angeles, CA (United States)
- 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; 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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