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Title: Electron Inertial Effects on Linearly Polarized Electromagnetic Ion Cyclotron Waves at Earth's Magnetosphere

Abstract

We propose a role of the electron inertial effect on linearly polarized electromagnetic ion cyclotron (EMIC) waves at Earth. The linearly polarized EMIC waves have been previously suggested to be generated via mode conversion from the fast compressional wave at the ion-ion hybrid (IIH) resonance. When the electron inertial effects are neglected, the wave normal angle of the mode-converted IIH waves is 90° because the wave vector perpendicular to the magnetic field becomes infinite at the IIH resonance. When the electron inertial effect is considered, the mode-converted IIH waves can propagate across the magnetic field lines, and the wavelength perpendicular to the magnetic field approaches the electron inertial length scale near the Buchsbaum resonance. These waves are referred to as electron inertial waves. Due to the electron inertial effect, the perpendicular wave number to the ambient magnetic field near the IIH resonance remains finite, and the wave normal angle is less than 90°. The wave normal angle where the maximum absorption occurs in a dipole magnetic field is 30–80°, which is consistent with the observed values near the magnetic equator. Thus, the numerical results imply that the linearly polarized EMIC wave generated via mode conversion near the IIH resonance canmore » be detected in between the Buchsbaum and the IIH resonance frequencies, and these waves can have normal angle less than 90°.« less

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]
  1. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  2. Andrews Univ., Berrien Springs, MI (United States)
  3. Kyung Hee Univ., Yongin, Gyeonggi (South Korea)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1510303
Grant/Contract Number:  
AC02‐09CH11466; 80HQTR18T0066; NNX17AI50G; NNX17AI47G; NNX16AR10G; NNX16AQ87G; AGS1602855
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 124; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Kim, Eun‐Hwa, Johnson, Jay R., and Lee, Dong‐Hun. Electron Inertial Effects on Linearly Polarized Electromagnetic Ion Cyclotron Waves at Earth's Magnetosphere. United States: N. p., 2019. Web. doi:10.1029/2019JA026532.
Kim, Eun‐Hwa, Johnson, Jay R., & Lee, Dong‐Hun. Electron Inertial Effects on Linearly Polarized Electromagnetic Ion Cyclotron Waves at Earth's Magnetosphere. United States. doi:10.1029/2019JA026532.
Kim, Eun‐Hwa, Johnson, Jay R., and Lee, Dong‐Hun. Wed . "Electron Inertial Effects on Linearly Polarized Electromagnetic Ion Cyclotron Waves at Earth's Magnetosphere". United States. doi:10.1029/2019JA026532. https://www.osti.gov/servlets/purl/1510303.
@article{osti_1510303,
title = {Electron Inertial Effects on Linearly Polarized Electromagnetic Ion Cyclotron Waves at Earth's Magnetosphere},
author = {Kim, Eun‐Hwa and Johnson, Jay R. and Lee, Dong‐Hun},
abstractNote = {We propose a role of the electron inertial effect on linearly polarized electromagnetic ion cyclotron (EMIC) waves at Earth. The linearly polarized EMIC waves have been previously suggested to be generated via mode conversion from the fast compressional wave at the ion-ion hybrid (IIH) resonance. When the electron inertial effects are neglected, the wave normal angle of the mode-converted IIH waves is 90° because the wave vector perpendicular to the magnetic field becomes infinite at the IIH resonance. When the electron inertial effect is considered, the mode-converted IIH waves can propagate across the magnetic field lines, and the wavelength perpendicular to the magnetic field approaches the electron inertial length scale near the Buchsbaum resonance. These waves are referred to as electron inertial waves. Due to the electron inertial effect, the perpendicular wave number to the ambient magnetic field near the IIH resonance remains finite, and the wave normal angle is less than 90°. The wave normal angle where the maximum absorption occurs in a dipole magnetic field is 30–80°, which is consistent with the observed values near the magnetic equator. Thus, the numerical results imply that the linearly polarized EMIC wave generated via mode conversion near the IIH resonance can be detected in between the Buchsbaum and the IIH resonance frequencies, and these waves can have normal angle less than 90°.},
doi = {10.1029/2019JA026532},
journal = {Journal of Geophysical Research. Space Physics},
number = ,
volume = 124,
place = {United States},
year = {2019},
month = {4}
}

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