Duct Effect of Magnetic Structures on Whistler Waves

Yu, Xiongdong; Yuan, Zhigang

doi:10.1029/2022ja031013

Cited by 6 publications

(8 citation statements)

References 42 publications

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“…Recent studies have found that not only density structures but also magnetic structures can affect the wave propagations (e.g., Yu & Yuan, 2022). MS waves have also been observed locally in magnetic structures without any leakage (Yu et al., 2022), suggesting potential ducting effects of MS waves through full reflections by the magnetic structures.…”

Section: Discussionmentioning

confidence: 99%

Analytical Approach to Two‐Dimensional Full Reflections of Fast Magnetosonic Waves Due To Mesoscale Density Boundaries

Yu,

Yuan,

Yao

2023

Geophysical Research Letters

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Propagation of fast magnetosonic (MS) waves in the equatorial plane has attracted a growing attention in recent studies. Although computer simulations including ray tracing, PIC, and full wave simulations have been utilized to study the propagation of MS waves, analytical approach is needed to investigate the physics insight. In this letter, we first derive the wave equations describing the two‐dimensional propagation of MS waves under the assumption that the mesoscale density inhomogeneity is only along one dimensional. After investigating the essential role of the potential function in the wave equation for the full reflection of MS waves, we find that full reflection can occur when the minimum potential is significantly negative. Finally, we have discussed the effects of incidence angles and wave frequencies on the full reflection. Our results show that MS waves with an incidence angle or wave frequency greater than the critical value would be fully reflected.

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Section: Discussionmentioning

confidence: 99%

Analytical Approach to Two‐Dimensional Full Reflections of Fast Magnetosonic Waves Due To Mesoscale Density Boundaries

Yu,

Yuan,

Yao

2023

Geophysical Research Letters

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“…Then, one can solve the perpendicular refractive index (q) through Equations 3 and 4 with the observed wave frequency, plasma densities, and given values of p. EMIC waves can be retained in the magnetic dip for a long time if there exist closed loops in the solved q-patterns which indicates wave ducting via linear mode conversions, as has been demonstrated in Karpman and Kaufman (1982) and X. Yu and Yuan (2022).…”

Section: 1029/2022ja031178mentioning

confidence: 99%

“…Following previous studies (Karpman & Kaufman, 1982;Streltsov et al, 2006;X. Yu & Yuan, 2022), we will solve the refractive index inside the magnetic dip under certain plasma environments and find the potential mode conversions between branches with different refractive indices and Poynting vectors.…”

Section: Theoretical Modelingmentioning

confidence: 99%

Effects of Magnetic Dips on the Propagation of Electromagnetic Ion Cyclotron Waves

Yuan

Huang

et al. 2023

JGR Space Physics

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“…Despite the abundant presence of magnetic structures in the inner magnetosphere, the trapping mechanism of the whistler‐mode waves by them has not been studied well. Recently, Yu and Yuan (2022) studied ducting of the whistler‐mode wave by the magnetic dips and peaks by analyzing the wave refractive index.…”

Section: Introductionmentioning

confidence: 99%

Whistler‐Mode Waves in Magnetic Ducts

Streltsov

Nejad

2023

JGR Space Physics

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Observations from the NASA MMS satellites show packages of ELF whistler‐mode waves localized inside the small‐scale irregularities of the magnetic field. These irregularities are formed by the narrow field‐aligned channels where the magnitude of the background magnetic field inside the channel is greater or less than outside. By analogy with the classical density ducts, we introduce the high‐B duct (HBD), where the magnitude of the field inside the channel is greater than the outside, and the low‐B duct (LBD), where the magnitude of the field inside the channel is less than the outside. We investigate the guiding of the ELF whistler‐mode waves by high‐B and low‐B ducts. We derive the analytical criteria for the wave ducting by these ducts and confirm them with two‐dimension, time‐dependent simulations of the electron‐MHD model. Also, we model ELF whistler‐mode waves observed inside the high‐B and low‐B ducts by MMS satellites.This article is protected by copyright. All rights reserved.

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Duct Effect of Magnetic Structures on Whistler Waves

Abstract: Whistler waves often have a right-hand polarization and a frequency below the electron gyrofrequency (f ce ) and are thought to be generated by suprathermal electrons with a temperature anisotropy (

Cited by 6 publications

References 42 publications

Analytical Approach to Two‐Dimensional Full Reflections of Fast Magnetosonic Waves Due To Mesoscale Density Boundaries

Analytical Approach to Two‐Dimensional Full Reflections of Fast Magnetosonic Waves Due To Mesoscale Density Boundaries

Effects of Magnetic Dips on the Propagation of Electromagnetic Ion Cyclotron Waves

Whistler‐Mode Waves in Magnetic Ducts

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