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In situ evidence of the modification of the parallel propagation of EMIC waves by heated He+ ions

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1002/2016JA022573· OSTI ID:1473808
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3]
  1. Wuhan Univ. (China). School of Electronic Information
  2. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
With observations of the Van Allen Probe B, we report in situ evidence of the modification of the parallel propagating electromagnetic ion cyclotron (EMIC) waves by heated He+ ions. In the outer boundary of the plasmasphere, accompanied with the He+ ion heating, the frequency bands of H+ and He+ for EMIC waves merged into each other, leading to the disappearance of a usual stop band between the gyrofrequency of He+ ions (ΩHe+) and the H+ cutoff frequency (ωH+co) in the cold plasma. Moreover, the dispersion relation for EMIC waves theoretically calculated with the observed plasma parameters also demonstrates that EMIC waves can indeed parallel propagate across ΩHe+. Therefore, this work provides an in situ evidence of the modification of the parallel propagation of EMIC waves by heated He+ ions.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautic and Space Administration (NASA); National Natural Science Foundation of China (NSFC); USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1473808
Report Number(s):
LA-UR--17-29397
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 7 Vol. 121; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

The occurrence and wave properties of EMIC waves observed by the Magnetospheric Multiscale (MMS) mission: EMIC Wave Properties journal August 2017
Excitation of O + Band EMIC Waves Through H + Ring Velocity Distributions: Van Allen Probe Observations journal February 2018
Propagation of EMIC Waves Inside the Plasmasphere: A Two‐Event Study journal November 2019

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