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Title: Generation Process of Large-Amplitude Upper-Band Chorus Emissions Observed by Van Allen Probes

Journal Article · · Journal of Geophysical Research. Space Physics
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Kyoto Univ. (Japan). Research Inst. for Sustainable Humanosphere; Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
  2. Kyoto Univ. (Japan). Research Inst. for Sustainable Humanosphere
  3. Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations

In this paper, we analyze large-amplitude upper-band chorus emissions measured near the magnetic equator by the Electric and Magnetic Field Instrument Suite and Integrated Science instrument package on board the Van Allen Probes. In setting up the parameters of source electrons exciting the emissions based on theoretical analyses and observational results measured by the Helium Oxygen Proton Electron instrument, we calculate threshold and optimum amplitudes with the nonlinear wave growth theory. We find that the optimum amplitude is larger than the threshold amplitude obtained in the frequency range of the chorus emissions and that the wave amplitudes grow between the threshold and optimum amplitudes. Finally, in the frame of the wave growth process, the nonlinear growth rates are much greater than the linear growth rates.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE; National Aeronautics and Space Administration (NASA) (United States); Ministry of Education, Culture, Sports, Science and Technology (MEXT) (Japan); Japan Society for the Promotion of Science (JSPS)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1441311
Report Number(s):
LA-UR--17-29191
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 5 Vol. 123; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

References (15)

Fine structure of large-amplitude chorus wave packets: STRUCTURE OF CHORUS WAVE PACKETS journal January 2014
Very oblique whistler generation by low-energy electron streams: OBLIQUE WHISTLER-MODE WAVE GENERATION journal May 2015
Helium, Oxygen, Proton, and Electron (HOPE) Mass Spectrometer for the Radiation Belt Storm Probes Mission journal March 2013
The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on RBSP journal June 2013
Theory and simulation of the generation of whistler-mode chorus: GENERATION PROCESS OF CHORUS EMISSIONS journal April 2008
Nonlinear mechanisms of lower-band and upper-band VLF chorus emissions in the magnetosphere: NONLINEAR MECHANISMS OF CHORUS EMISSIONS journal July 2009
Oblique propagation of whistler mode waves in the chorus source region: OBLIQUE CHORUS journal December 2009
Self-consistent particle simulation of whistler mode triggered emissions: TRIGGERED RISING EMISSION journal December 2010
Triggering process of whistler mode chorus emissions in the magnetosphere: TRIGGERING MECHANISM OF CHORUS EMISSIONS journal May 2011
Global distribution of wave amplitudes and wave normal angles of chorus waves using THEMIS wave observations: CHORUS WAVE DISTRIBUTION ON THEMIS journal December 2011
Particle simulations of whistler-mode rising-tone emissions triggered by waves with different amplitudes: TRIGGERED WHISTLER MODE EMISSION journal April 2012
Nonlinear spatiotemporal evolution of whistler mode chorus waves in Earth's inner magnetosphere: SPATIOTEMPORAL EVOLUTION OF CHORUS journal September 2012
THEMIS observation of chorus elements without a gap at half the gyrofrequency: CONTINUOUS RISING TONE CHORUS journal November 2012
Some comments on the descriptions of the polarization states of waves journal April 1980
Ray tracing of whistler-mode chorus elements: implications for generation mechanisms of rising and falling tone emissions journal January 2013

Cited By (3)

Remote Sensing of Radiation Belt Energetic Electrons Using Lightning Triggered Upper Band Chorus journal January 2019
Effects of Ducting on Whistler Mode Chorus or Exohiss in the Outer Radiation Belt journal June 2019
Remote Sensing of Radiation Belt Energetic Electrons Using Lightning Triggered Upper Band Chorus conference January 2019

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79 ASTRONOMY AND ASTROPHYSICS
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