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Evolution of chorus emissions into plasmaspheric hiss observed by Van Allen Probes

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1002/2016JA022366· OSTI ID:1338752
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [5];  [6]
  1. Changsha Univ. of Science and Technology, Changsha (China). School of Physics and Electronic Sciences
  2. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
  3. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
  4. Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Space Science and Applications Group
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). ISR Division
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The two classes of whistler mode waves (chorus and hiss) play different roles in the dynamics of radiation belt energetic electrons. Chorus can efficiently accelerate energetic electrons, and hiss is responsible for the loss of energetic electrons. Previous studies have proposed that chorus is the source of plasmaspheric hiss, but this still requires an observational confirmation because the previously observed chorus and hiss emissions were not in the same frequency range in the same time. In this paper, we report simultaneous observations form Van Allen Probes that chorus and hiss emissions occurred in the same range ~300–1500 Hz with the peak wave power density about 10-5 nT2/Hz during a weak storm on 3 July 2014. Chorus emissions propagate in a broad region outside the plasmapause. Meanwhile, hiss emissions are confined inside the plasmasphere, with a higher intensity and a broader area at a lower frequency. A sum of bi-Maxwellian distribution is used to model the observed anisotropic electron distributions and to evaluate the instability of waves. A three-dimensional ray tracing simulation shows that a portion of chorus emission outside the plasmasphere can propagate into the plasmasphere and evolve into plasmaspheric hiss. Moreover, hiss waves below 1 kHz are more intense and propagate over a broader area than those above 1 kHz, consistent with the observation. Finally, the current results can explain distributions of the observed hiss emission and provide a further support for the mechanism of evolution of chorus into hiss emissions.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Changsha Univ. of Science and Technology, Changsha (China)
Sponsoring Organization:
USDOE; National Aeronautics and Space Administration (NASA); National Natural Science Foundation of China (NNSFC); Johns Hopkins University
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1338752
Report Number(s):
LA-UR--16-20482
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 5 Vol. 121; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Excitation of Highly Oblique Lower Band and Upper Band Chorus by a Loss Cone Feature and Temperature Anisotropy Distribution journal February 2019
Van Allen Probes Observations of Chorus Wave Vector Orientations: Implications for the Chorus‐to‐Hiss Mechanism journal March 2019
Parallel Acceleration of Suprathermal Electrons Caused by Whistler‐Mode Hiss Waves journal November 2019
Survey of Saturn Whistler Mode Hiss Intensity journal June 2019

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
RBSP results
chorus waves
heliospheric and magnetospheric physics
plasmaspheric hiss