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Title: Chorus Waves Modulation of Langmuir Waves in the Radiation Belts

Abstract

Using high-resolution waveforms measured by the Van Allen Probes, we report a novel observation in the radiation belts. Namely, we show that multiband, discrete, rising-tone whistler-mode chorus emissions exhibit a one-to-one correlation with Langmuir wave bursts. Moreover, the periodic Langmuir wave bursts are generally observed at the phase location where the chorus wave E || component is oriented opposite to its propagation direction. The electron measurements show a beam in phase space density at the particle velocity that matches the parallel phase velocity of the chorus waves. Based on this evidence, we conclude that the chorus waves accelerate the suprathermal electrons via Landau resonance, and generate a localized electron beam in phase space density. Consequently, the Langmuir waves are excited locally and are modulated by the chorus wave phase. As a result, this microscale interaction between chorus waves and high frequency electrostatic waves provides a new insight into the nonlinear wave-particle interaction process.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [1]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Boston Univ., Boston, MA (United States)
  3. Univ. of Iowa, Iowa City, IA (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Univ. of New Hampshire, Durham, NH (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautic and Space Administration (NASA); USDOE
OSTI Identifier:
1410626
Report Number(s):
LA-UR-17-30490
Journal ID: ISSN 0094-8276; TRN: US1800143
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 44; Journal Issue: 23; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Heliospheric and Magnetospheric Physics

Citation Formats

Li, Jinxing, Bortnik, Jacob, An, Xin, Li, Wen, Thorne, Richard M., Zhou, Meng, Kurth, William S., Hospodarsky, George B., Funsten, Herbert O., and Spence, Harlan E. Chorus Waves Modulation of Langmuir Waves in the Radiation Belts. United States: N. p., 2017. Web. doi:10.1002/2017GL075877.
Li, Jinxing, Bortnik, Jacob, An, Xin, Li, Wen, Thorne, Richard M., Zhou, Meng, Kurth, William S., Hospodarsky, George B., Funsten, Herbert O., & Spence, Harlan E. Chorus Waves Modulation of Langmuir Waves in the Radiation Belts. United States. doi:10.1002/2017GL075877.
Li, Jinxing, Bortnik, Jacob, An, Xin, Li, Wen, Thorne, Richard M., Zhou, Meng, Kurth, William S., Hospodarsky, George B., Funsten, Herbert O., and Spence, Harlan E. Mon . "Chorus Waves Modulation of Langmuir Waves in the Radiation Belts". United States. doi:10.1002/2017GL075877.
@article{osti_1410626,
title = {Chorus Waves Modulation of Langmuir Waves in the Radiation Belts},
author = {Li, Jinxing and Bortnik, Jacob and An, Xin and Li, Wen and Thorne, Richard M. and Zhou, Meng and Kurth, William S. and Hospodarsky, George B. and Funsten, Herbert O. and Spence, Harlan E.},
abstractNote = {Using high-resolution waveforms measured by the Van Allen Probes, we report a novel observation in the radiation belts. Namely, we show that multiband, discrete, rising-tone whistler-mode chorus emissions exhibit a one-to-one correlation with Langmuir wave bursts. Moreover, the periodic Langmuir wave bursts are generally observed at the phase location where the chorus wave E|| component is oriented opposite to its propagation direction. The electron measurements show a beam in phase space density at the particle velocity that matches the parallel phase velocity of the chorus waves. Based on this evidence, we conclude that the chorus waves accelerate the suprathermal electrons via Landau resonance, and generate a localized electron beam in phase space density. Consequently, the Langmuir waves are excited locally and are modulated by the chorus wave phase. As a result, this microscale interaction between chorus waves and high frequency electrostatic waves provides a new insight into the nonlinear wave-particle interaction process.},
doi = {10.1002/2017GL075877},
journal = {Geophysical Research Letters},
number = 23,
volume = 44,
place = {United States},
year = {Mon Nov 20 00:00:00 EST 2017},
month = {Mon Nov 20 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
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