Localization of Ultra-Low Frequency Waves in Multi-Ion Plasmas of the Planetary Magnetosphere

Kim, Eun Hwa; Lee, Dong Hun

doi:10.5140/jass.2015.32.4.289

Cited by 8 publications

(8 citation statements)

References 35 publications

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“…Without the electron inertial effect, mode‐converted waves propagate only along the magnetic field and localized into B 0 . Unlike shear Alfvén waves, the IIH waves have cutoff condition at S = 0; therefore, these waves can be localized between two S = 0 locations (Kim et al, , ; Klimushkin et al, ; Vincena et al, ). These waves also propagate across the magnetic field toward inner magnetosphere as the EIW.…”

Section: Discussionmentioning

confidence: 99%

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

Kim

Lee

2019

JGR Space Physics

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We discuss 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. Therefore, the numerical results suggest 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 • . Key Points:• Mode-converted ion-ion hybrid waves can propagate toward the Buchsbaum resonance due to the electron inertial effects • Electron inertial effects allow the mode-converted ion-ion hybrid waves have medium normal angle less than 90 • • Linearly polarized EMIC waves generated via mode conversion can have relatively small normal angle between 30 and 80 •

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Section: Discussionmentioning

confidence: 99%

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

Kim

Lee

2019

JGR Space Physics

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“…Theoretical studies of IIH waves in the terrestrial magnetosphere were performed in [11][12][13][14]. In particular, it was found that if the field-aligned plasma and magnetic field inhomogeneity are taken into account, the IIH waves are locked near the geomagnetic equator between two cut-off points [15][16][17][18][19]. It has been confirmed by observations that linearly-polarized Pc1 waves are mostly observed in the equatorial region [20][21][22].…”

Section: Introductionmentioning

confidence: 87%

“…The IIH wave with such polarization can be called the toroidal IIH mode. Then, the first term in equation (19) dominates and this equation can be satisfied provided that Φ is proportional to the eigenfunction of the toroidal operator T N :…”

Section: ( )mentioning

confidence: 99%

“…λ a and according to equation (5) the wave has poloidal polarization: E a ?E r . Then, the second term in equation (19) dominates and the Φ-function must be proportional to the eigenfunction of the poloidal operator P N :…”

Section: ( )mentioning

confidence: 99%

“…A p and A h are the Alfvén speeds for the protons and heavy ions, respectively. Let us consider equation (19) in the Wentzel-Kramers-Brillouin (WKB) approximation. Then equation (19) takes the form…”

Section: Near-equatorial Approximationmentioning

confidence: 99%

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Two modes of ion-ion hybrid waves in magnetospheric plasma

Mikhailova

Mager

Klimushkin

2019

Plasma Phys. Control. Fusion

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This paper is concerned with the structure of ion-ion hybrid (IIH) waves in multicomponent magnetospheric plasma in the dipole geomagnetic field model. Like Alfvén waves, in IIH waves the field line can oscillate in different directions: in the azimuthal direction (the toroidal modes) and in the radial direction (the poloidal modes). Contrary to Alfvén waves, in IIH waves only the equatorial part of the field line can oscillate, since due to the heavy ions admixture the IIH waves are trapped in the resonator in the vicinity of the geomagnetic equator. The equatorial localization of the waves allow the calculation of the parallel structure of the toroidal and poloidal IIH modes analytically. It was found that the toroidal and poloidal modes have slightly different structures and that their frequencies are also slightly different. The difference between toroidal and poloidal frequencies (the polarization splitting) is small with respect to the basic harmonics of each mode. It was found that IIH modes have a considerable compressional component of the wave's magnetic field.

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Charged Particle Acceleration

Parks

2018

Characterizing Space Plasmas

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Localization of Ultra-Low Frequency Waves in Multi-Ion Plasmas of the Planetary Magnetosphere

Cited by 8 publications

References 35 publications

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

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

Two modes of ion-ion hybrid waves in magnetospheric plasma

Charged Particle Acceleration

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