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Generation of Highly Oblique Lower Band Chorus Via Nonlinear Three-Wave Resonance

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2017GL074411· OSTI ID:1415428
 [1];  [2];  [3];  [4];  [4]
  1. New Mexico Consortium, Los Alamos, NM (United States)
  2. Space Science Institute, Boulder, CO (United States)
  3. New Mexico Consortium, Los Alamos, NM (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations

Chorus in the inner magnetosphere has been observed frequently at geomagnetically active times, typically exhibiting a two-band structure with a quasi-parallel lower band and an upper band with a broad range of wave normal angles. But recent observations by Van Allen Probes confirm another type of lower band chorus, which has a large wave normal angle close to the resonance cone angle. It has been proposed that these waves could be generated by a low-energy beam-like electron component or by temperature anisotropy of keV electrons in the presence of a low-energy plateau-like electron component. This paper, however, presents an alternative mechanism for generation of this highly oblique lower band chorus. Through a nonlinear three-wave resonance, a quasi-parallel lower band chorus wave can interact with a mildly oblique upper band chorus wave, producing a highly oblique quasi-electrostatic lower band chorus wave. This theoretical analysis is confirmed by 2-D electromagnetic particle-in-cell simulations. Furthermore, as the newly generated waves propagate away from the equator, their wave normal angle can further increase and they are able to scatter low-energy electrons to form a plateau-like structure in the parallel velocity distribution. As a result, the three-wave resonance mechanism may also explain the generation of quasi-parallel upper band chorus which has also been observed in the magnetosphere.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
NASA; USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1415428
Report Number(s):
LA-UR--17-30358
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 19 Vol. 44; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

The Effect of Hot Protons on Magnetosonic Waves Inside and Outside the Plasmapause: New Observations and Theoretic Results journal January 2018
Nonlinear Evolution of Counter-Propagating Whistler Mode Waves Excited by Anisotropic Electrons Within the Equatorial Source Region: 1-D PIC Simulations journal February 2018
Generation of Lower Harmonic Magnetosonic Waves Through Nonlinear Wave‐Wave Interactions journal August 2018
Nonlinear Coupling Between Whistler‐Mode Chorus and Electron Cyclotron Harmonic Waves in the Magnetosphere journal December 2018
Excitation of Highly Oblique Lower Band and Upper Band Chorus by a Loss Cone Feature and Temperature Anisotropy Distribution journal February 2019
Highly Oblique Lower-Band Chorus Statistics: Dependencies of Wave Power on Refractive Index and Geomagnetic Activity: OBLIQUE CHORUS POWER CHARACTERISTICS journal June 2018
Recent Advancements and Remaining Challenges Associated With Inner Magnetosphere Cross‐Energy/Population Interactions (IMCEPI) journal February 2019
The Effects of Thermal Electrons on Whistler Mode Waves Excited by Anisotropic Hot Electrons: Linear Theory and 2‐D PIC Simulations journal July 2019
Theoretical analysis on lower band cascade as a mechanism for multiband chorus in the Earth’s magnetosphere journal May 2018
Low-frequency hiss-like whistler-mode waves generated by nonlinear three-wave interactions outside the plasmasphere journal December 2019
Two- and Three-dimensional Nonlinear Instabilities of Whistler Waves journal October 2018

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Related Subjects

58 GEOSCIENCES
Heliospheric and Magnetospheric Physics
PIC simulation
oblique whistler
ray tracing
three-wave resonance