Electron inertial effects on linearly polarized electromagnetic ion cyclotron waves at Earth's magnetosphere

Kim, Eun-Hwa; Johnson, Jay; Lee, Dong-Hun

doi:10.11578/1562102

Title: Electron inertial effects on linearly polarized electromagnetic ion cyclotron waves at Earth's magnetosphere

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Abstract

We discuss a role of the electron inertial effect on linearly polarized electromagnetic ioncyclotron (EMIC) waves at Earth. The linearly polarized EMIC waves have been previouslysuggested to be generated via mode conversion from the fast compressional wave at the ion-ionhybrid (IIH) resonance. When the electron inertial effects are neglected, the wave normal angleof the mode-converted IIH waves is 90 degrees because the wavevector perpendicular to themagnetic field becomes infinite at the IIH resonance. When the electron inertial effect isconsidered, the mode-converted IIH waves can propagate across the magnetic field lines and thewavelength perpendicular to the magnetic field approaches the electron inertial length scale nearthe Buchsbaum resonance. These waves are referred to as electron inertial waves. Due to theelectron inertial effect, the perpendicular wavenumber to the ambient magnetic field near theIIH resonance remains finite and the wave normal angle is less than 90 degrees. The wave normalangle where the maximum absorption occurs in a dipole magnetic field is 30-80 degrees, whichis consistent with the observed values near the magnetic equator. Therefore, the numericalresults suggest that the linearly polarized EMIC wave generated via mode conversion near theIIH resonance can be detected in between the Buchsbaum and the IIH resonance frequencies,and these wavesmore »« less

Authors:

Kim, Eun-Hwa; Johnson, Jay; Lee, Dong-Hun

OSTI

Publication Date:: Mon Apr 01 00:00:00 EDT 2019

Research Org.:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Org.:: U. S. Department of Energy

Subject:: null

OSTI Identifier:: 1562102

DOI:: https://doi.org/10.11578/1562102

Citation Formats


                    Kim, Eun-Hwa, Johnson, Jay, 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:10.11578/1562102.

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                    Kim, Eun-Hwa, Johnson, Jay, & Lee, Dong-Hun. Electron inertial effects on linearly polarized electromagnetic ion cyclotron waves at Earth's magnetosphere.  United States.  doi:https://doi.org/10.11578/1562102

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                    Kim, Eun-Hwa, Johnson, Jay, and Lee, Dong-Hun. 2019.  
"Electron inertial effects on linearly polarized electromagnetic ion cyclotron waves at Earth's magnetosphere".  United States.  doi:https://doi.org/10.11578/1562102.  https://www.osti.gov/servlets/purl/1562102. Pub date:Mon Apr 01 00:00:00 EDT 2019

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@article{osti_1562102,

  title        = {Electron inertial effects on linearly polarized electromagnetic ion cyclotron waves at Earth's magnetosphere},

  author       = {Kim, Eun-Hwa and Johnson, Jay and Lee, Dong-Hun},

  abstractNote = {We discuss a role of the electron inertial effect on linearly polarized electromagnetic ioncyclotron (EMIC) waves at Earth. The linearly polarized EMIC waves have been previouslysuggested to be generated via mode conversion from the fast compressional wave at the ion-ionhybrid (IIH) resonance. When the electron inertial effects are neglected, the wave normal angleof the mode-converted IIH waves is 90 degrees because the wavevector perpendicular to themagnetic field becomes infinite at the IIH resonance. When the electron inertial effect isconsidered, the mode-converted IIH waves can propagate across the magnetic field lines and thewavelength perpendicular to the magnetic field approaches the electron inertial length scale nearthe Buchsbaum resonance. These waves are referred to as electron inertial waves. Due to theelectron inertial effect, the perpendicular wavenumber to the ambient magnetic field near theIIH resonance remains finite and the wave normal angle is less than 90 degrees. The wave normalangle where the maximum absorption occurs in a dipole magnetic field is 30-80 degrees, whichis consistent with the observed values near the magnetic equator. Therefore, the numericalresults suggest that the linearly polarized EMIC wave generated via mode conversion near theIIH resonance can be detected in between the Buchsbaum and the IIH resonance frequencies,and these waves can have normal angle less than 90 degrees.},

  doi          = {10.11578/1562102},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Mon Apr 01 00:00:00 EDT 2019},

  month        = {Mon Apr 01 00:00:00 EDT 2019}

}

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DOI: https://doi.org/10.11578/1562102

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