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Modulation of chorus intensity by ULF waves deep in the inner magnetosphere

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2016GL070280· OSTI ID:1402618
 [1];  [1];  [2];  [3];  [4];  [5];  [6]
  1. Univ. of Texas, Dallas, TX (United States). Dept. of Physics
  2. Chinese Academy of Sciences (CAS), Beijing (China). State Key Lab. of Space Weather. National Space Science Center
  3. Aerospace Corporation, El Segundo, CA (United States)
  4. Rice Univ., Houston, TX (United States). Dept. of Physics and Astronomy
  5. New Jersey Inst. of Technology, Newark, NJ (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations
Previous studies have shown that chorus wave intensity can be modulated by Pc4-Pc5 compressional ULF waves. In this paper, we present Van Allen Probes observation of ULF wave modulating chorus wave intensity, which occurred deep in the magnetosphere. The ULF wave shows fundamental poloidal mode signature and mirror mode compressional nature. The observed ULF wave can modulate not only the chorus wave intensity but also the distribution of both protons and electrons. Linear growth rate analysis shows consistence with observed chorus intensity variation at low frequency (f <~ 0.3fce), but cannot account for the observed higher-frequency chorus waves, including the upper band chorus waves. This suggests the chorus waves at higher-frequency ranges require nonlinear mechanisms. Finally, in addition, we use combined observations of Radiation Belt Storm Probes (RBSP) A and B to verify that the ULF wave event is spatially local and does not last long.
Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Rice Univ., Houston, TX (United States); Univ. of Texas, Dallas, TX (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA) (United States); National Science Foundation (NSF) (United States); USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1402618
Report Number(s):
LA-UR--16-26169
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 18 Vol. 43; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

On the Driver of Daytime Pc3 Auroral Pulsations journal January 2019
Magnetospheric Chorus, Exohiss, and Magnetosonic Emissions Simultaneously Modulated by Fundamental Toroidal Standing Alfvén Waves Following Solar Wind Dynamic Pressure Fluctuations journal February 2019
Spatial Extent and Temporal Correlation of Chorus and Hiss: Statistical Results From Multipoint THEMIS Observations journal October 2018
Modulation of Locally Generated Equatorial Noise by ULF Wave journal April 2019
Precipitation of MeV and Sub‐MeV Electrons Due to Combined Effects of EMIC and ULF Waves journal October 2019
The Storm‐Time Ring Current Response to ICMEs and CIRs Using Van Allen Probe Observations journal November 2019
Periodic Excitation of Chorus and ECH Waves Modulated by Ultralow Frequency Compressions journal November 2019
Observational evidence of the drift-mirror plasma instability in Earth's inner magnetosphere journal April 2019
Observations of Whistler Waves Correlated with Electron-scale Coherent Structures in the Magnetosheath Turbulent Plasma journal June 2018

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ULF wave
chorus modulation
inner magnetosphere
whistler wave