Whistler propagation in inhomogeneous plasma

Streltsov, A. V.; Lampe, Mártin; Manheimer, Wallace M.; Ganguli, G.; Joyce, G.

doi:10.1029/2005ja011357

Cited by 86 publications

(203 citation statements)

References 18 publications

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“…Even with this effective finite perpendicular wavelength, we expect these whistlers to be effectively trapped inside any of the three density enhancements [Streltsov et al, 2006]. Note that along with a finite perpendicular wavelength, both˙k ?…”

Section: Input Signalmentioning

confidence: 99%

“…The basic theory of whistler ducting [Streltsov et al, 2006] tells us that a single duct is capable of trapping whistlers with particular a range of different wave normal angles. Based on the criteria of n > n 0 and the dispersion relationship, the maximum wave normal angle of a wave that can be trapped in a given density enhancement is max = cos…”

Section: Input Signalmentioning

confidence: 99%

“…[12] It is sometimes convenient to instead use a flatbottomed channel model, particularly in theoretical studies [Streltsov et al, 2006], but some manner of bell-shaped profile (whether quadratic, Gaussian, or some other similarly behaved function) is typically assumed. Although any sort of profile is possible owing to the poor mobility of electrons across the magnetic field (they are "frozen-in" to the plasma at the frequencies of interest), it would be expected that the profile of the enhancement be similar to that of its source.…”

Section: Duct Characterizationmentioning

confidence: 99%

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Whistler propagation in ionospheric density ducts: Simulations and DEMETER observations

et al. 2013

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, the Detection of Electromagnetic Emissions Transmitted from Earthquake Regions (DEMETER) satellite observed VLF whistler wave activity coincident with an ionospheric heating experiment conducted at HAARP. At the same time, density measurements by DEMETER indicate the presence of multiple field-aligned enhancements. Using an electron MHD model, we show that the distribution of VLF power observed by DEMETER is consistent with the propagation of whistlers from the heating region inside the observed density enhancements. We also discuss other interesting features of this event, including coupling of the lower hybrid and whistler modes, whistler trapping in artificial density ducts, and the interference of whistlers waves from two adjacent ducts.Citation: Woodroffe, J. R., A. V. Streltsov, A. Vartanyan, and G. M. Milikh (2013), Whistler propagation in ionospheric density ducts: Simulations and demeter observations,

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Section: Input Signalmentioning

confidence: 99%

Section: Input Signalmentioning

confidence: 99%

Section: Duct Characterizationmentioning

confidence: 99%

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Whistler propagation in ionospheric density ducts: Simulations and DEMETER observations

et al. 2013

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“…Numerical experiments are also useful, even though an amount of computational resources are required in solving a set of Maxwell's equations and the equation of motion of cold plasma, because they can reproduce the wave amplitude variation and the spatial extent of wave packets during their propagation (Streltsov et al 2006(Streltsov et al , 2010(Streltsov et al , 2012. In the present study, we have developed a spatially twodimensional simulation code for the study of the propagation of chorus in the dipole magnetic field.…”

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confidence: 99%

A simulation study of the propagation of whistler-mode chorus in the Earth’s inner magnetosphere

Katoh

2014

Earth Planet Sp

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We study the propagation of whistler-mode chorus in the magnetosphere by a spatially two-dimensional simulation code in the dipole coordinates. We set the simulation system so as to assume the outside of the plasmapause, corresponding to the radial distance from 3.9 to 4.1 R E in the equatorial plane and the latitudinal range from −15 • to +15 • , where R E is the Earth's radius. We assume a model chorus element propagating northward from the magnetic equator of the field line at L = 4 with a rising tone from 0.2 to 0.7 e0 in the time scale of 5,000e0 , where e0 is the electron gyrofrequency at the magnetic equator. For the initial density distribution of cold electrons, we assume three types of initial conditions in the outside of the plasmapause: without a duct (run 1), a density enhancement duct (run 2), and a density decrease duct (run 3). In run 1, the simulation result reveals that whistler-mode waves of the different wave frequencies propagate in the different ray path in the region away from the magnetic equator. In runs 2 and 3, the model chorus element propagates inside the assumed duct with changing wave normal angle. The simulation results show the different propagation properties of the chorus element in runs 2 and 3 and reveal that resultant wave spectra observed along the field line are different between the density enhancement and density decrease duct cases. The spectral modification of chorus by the propagation effect should play a significant role in the interactions between chorus and energetic electrons in the magnetosphere, particularly in the region away from the equator. The present study clarifies that the variation of propagation properties of chorus should be taken into account for the thorough understanding of resonant interactions of chorus with energetic electrons in the inner magnetosphere.

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“…Eigenmodes are formed by integer azimuthal wavenumbers m and radially quantized wavenumbers k r = m/r due to reflecting boundaries. This concept has also been used in solid-state plasmas [8] and space plasmas for wave propagation in narrow density ducts [117]. This wave theory is questionable since in an anisotropic plasma the group and phase velocities differ, which yields different reflections for phase and group velocities.…”

Section: Heliconsmentioning

confidence: 99%

Whistler waves with angular momentum in space and laboratory plasmas and their counterparts in free space

Stenzel

2016

Advances in Physics: X

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Electromagnetic waves with helical phase surfaces arise in different fields of physics such as space plasmas, laboratory plasmas, solid-state physics, atomic, molecular and optical sciences. Their common features are the wave orbital angular momentum associated with the circular wave propagation around the axis of wave propagation. In plasmas these waves are called helicons. When particles or waves change the field momentum they experience a pressure and a torque which can lead to useful applications. In plasmas electrons can damp or excite rotating whistlers, depending on the electron distribution function in velocity space. A magnetized plasma is an anisotropic medium in which electromagnetic waves propagate differently than in space. Phase and group velocities are different such that wave focusing and wave reflections are different from those in free space. Electrons experience Doppler shifts and cyclotron resonance which creates wave damping and growth. All media exhibit nonlinear effects which do not occur in free space. Common and different features of vortex waves in different fields will be reviewed. However, a comprehensive review of this vast field is not possible and further readings are referred to the cited literature. ARTICLE HISTORY

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Whistler propagation in inhomogeneous plasma

Cited by 86 publications

References 18 publications

Whistler propagation in ionospheric density ducts: Simulations and DEMETER observations

Whistler propagation in ionospheric density ducts: Simulations and DEMETER observations

A simulation study of the propagation of whistler-mode chorus in the Earth’s inner magnetosphere

Whistler waves with angular momentum in space and laboratory plasmas and their counterparts in free space

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