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

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 nT 2/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 aremore » 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.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ; ORCiD logo [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
Publication Date:
Report Number(s):
LA-UR-16-20482
Journal ID: ISSN 2169-9380
Grant/Contract Number:
AC52-06NA25396; NAS5-01072; 41531072; 41274165; 41404130; 921647; 967399
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 5; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Changsha Univ. of Science and Technology, Changsha (China)
Sponsoring Org:
USDOE; National Aeronautic and Space Administration (NASA); National Natural Science Foundation of China (NNSFC); Johns Hopkins Univ. Applied Physics Lab. (APL) (United States)
Contributing Orgs:
Univ. of Minnesota, Minneapolis, MN (United States); Univ. of Colorado, Boulder, CO (United States); Univ. of New Hampshire, Durham, NH (United States)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; heliospheric and magnetospheric physics; plasmaspheric hiss; chorus waves; RBSP results
OSTI Identifier:
1338752

Zhou, Qinghua, Xiao, Fuliang, Yang, Chang, Liu, Si, He, Yihua, Wygant, J. R., Baker, D. N., Spence, H. E., Reeves, Geoffrey D., and Funsten, Herbert O.. Evolution of chorus emissions into plasmaspheric hiss observed by Van Allen Probes. United States: N. p., Web. doi:10.1002/2016JA022366.
Zhou, Qinghua, Xiao, Fuliang, Yang, Chang, Liu, Si, He, Yihua, Wygant, J. R., Baker, D. N., Spence, H. E., Reeves, Geoffrey D., & Funsten, Herbert O.. Evolution of chorus emissions into plasmaspheric hiss observed by Van Allen Probes. United States. doi:10.1002/2016JA022366.
Zhou, Qinghua, Xiao, Fuliang, Yang, Chang, Liu, Si, He, Yihua, Wygant, J. R., Baker, D. N., Spence, H. E., Reeves, Geoffrey D., and Funsten, Herbert O.. 2016. "Evolution of chorus emissions into plasmaspheric hiss observed by Van Allen Probes". United States. doi:10.1002/2016JA022366. https://www.osti.gov/servlets/purl/1338752.
@article{osti_1338752,
title = {Evolution of chorus emissions into plasmaspheric hiss observed by Van Allen Probes},
author = {Zhou, Qinghua and Xiao, Fuliang and Yang, Chang and Liu, Si and He, Yihua and Wygant, J. R. and Baker, D. N. and Spence, H. E. and Reeves, Geoffrey D. and Funsten, Herbert O.},
abstractNote = {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.},
doi = {10.1002/2016JA022366},
journal = {Journal of Geophysical Research. Space Physics},
number = 5,
volume = 121,
place = {United States},
year = {2016},
month = {5}
}