Wave propagation in pulsar magnetospheres - Dispersion relations and normal modes of plasmas in superstrong magnetic fields

The objective of this study is to give an overview of existing theories for analyzing the behavior of sandwich beams and plates and to develop an approach for evaluating their behavior under dynamic loading. The dispersion relations for harmonic wave propagation through sandwich structures are shown to be a sound basis for evaluating whether the individual layers are modeled properly. The results provide a guide in the selection of existing models or the development of new models.

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The effect of fast-time-scale turbulence on magnetohydrodynamical behaviour

Journal of Plasma Physics ◽

10.1017/s0022377800001446 ◽

1984 ◽

Vol 31 (1) ◽

pp. 81-92 ◽

Cited By ~ 3

Author(s):

R. O. Dendy ◽

D. Ter Haar

Keyword(s):

Time Scale ◽

Normal Modes ◽

Dispersion Relations ◽

Magnetized Plasma ◽

Fast Time ◽

Fast Time Scale ◽

Scale Turbulence ◽

The Ideal

We show what corrections have to be made to the equations of ideal magneto-hydrodynamics when there is fast-time-scale turbulence present in a magnetized plasma. We show how the dispersion relations for the ideal Alfvén and magnetoacoustic MHD normal modes are modified when such turbulence is present. Finally, we discuss the relation of our work to that of other authors.

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NUMERICAL SIMULATION OF QUASI-NORMAL MODES IN TIME-DEPENDENT BACKGROUND

Modern Physics Letters A ◽

10.1142/s021773230401240x ◽

2004 ◽

Vol 19 (03) ◽

pp. 239-252 ◽

Cited By ~ 14

Author(s):

LI-HUI XUE ◽

ZAI-XIONG SHEN ◽

BIN WANG ◽

RU-KENG SU

Keyword(s):

Numerical Simulation ◽

Black Hole ◽

Wave Propagation ◽

Normal Modes ◽

Time Dependent ◽

Massless Scalar ◽

Scalar Wave ◽

Schwarzschild Black Hole ◽

Black Hole Background ◽

Scattering Potential

We study the massless scalar wave propagation in the time-dependent Schwarzschild black hole background. We find that the Kruskal coordinate is an appropriate framework to investigate the time-dependent spacetime. A time-dependent scattering potential is derived by considering dynamical black hole with parameters changing with time. It is shown that in the quasinormal ringing both the decay time-scale and oscillation are modified in the time-dependent background.

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Dispersion relation analysis of turbulent magnetic field fluctuations in fast solar wind

Annales Geophysicae ◽

10.5194/angeo-31-1949-2013 ◽

2013 ◽

Vol 31 (11) ◽

pp. 1949-1955 ◽

Cited By ~ 21

Author(s):

C. Perschke ◽

Y. Narita ◽

S. P. Gary ◽

U. Motschmann ◽

K.-H. Glassmeier

Keyword(s):

Magnetic Field ◽

Solar Wind ◽

High Speed ◽

Energy Transport ◽

Normal Modes ◽

Frequency Dispersion ◽

Dispersion Relations ◽

Wave Number ◽

Magnetic Fluctuations ◽

Speed Solar Wind

Abstract. Physical processes of the energy transport in solar wind turbulence are a subject of intense studies, and different ideas exist to explain them. This manuscript describes the investigation of dispersion properties in short-wavelength magnetic turbulence during a rare high-speed solar wind event with a flow velocity of about 700 km s−1 using magnetic field and ion data from the Cluster spacecraft. Using the multi-point resonator technique, the dispersion relations (i.e., frequency versus wave-number values in the solar wind frame) of turbulent magnetic fluctuations with wave numbers near the inverse ion inertial length are determined. Three major results are shown: (1) the wave vectors are uniformly quasi-perpendicular to the mean magnetic field; (2) the fluctuations show a broad range of frequencies at wavelengths around the ion inertial length; and (3) the direction of propagation at the observed wavelengths is predominantly in the sunward direction. These results suggest the existence of high-frequency dispersion relations partly associated with normal modes on small scales. Therefore nonlinear energy cascade processes seem to be acting that are not described by wave–wave interactions.

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Wave propagation in a moving plasma. Part 1. Wave propagation normal to the magnetic field and motion of the plasma along the magnetic field

Journal of Plasma Physics ◽

10.1017/s0022377800024740 ◽

1974 ◽

Vol 11 (3) ◽

pp. 389-395 ◽

Cited By ~ 1

Author(s):

D. N. Srivastava

Keyword(s):

Magnetic Field ◽

Wave Propagation ◽

Dispersion Relation ◽

Magnetic Fields ◽

Plasma Frequency ◽

Electron Plasma ◽

Ordinary Wave ◽

Moving Plasma ◽

The Magnetic Field

The dispersion relation for a collisionless moving electron plasma, when the direction of motion is along the magnetic field, and that of the wave propagation normal to the magnetic field, is analysed. It is shown that in small magnetic fields the ordinary wave develops a new band of backward waves below the plasma frequency. When the frequency of the wave is higher than the plasma frequency, the effect of the motion of the plasma is identical to a deviation of the direction of propagation.

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Shock Wave Propagation through Region of Electrical and Magnetic Fields Action

52nd Aerospace Sciences Meeting ◽

10.2514/6.2014-0828 ◽

2014 ◽

Cited By ~ 1

Author(s):

A. Erofeev ◽

Tatiana Lapushkina ◽

Serguei A. Poniaev

Keyword(s):

Shock Wave ◽

Wave Propagation ◽

Magnetic Fields ◽

Shock Wave Propagation

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Wave propagation in micromorphic anisotropic continua with an application to tetragonal crystals

Mathematics and Mechanics of Solids ◽

10.1177/1081286520971840 ◽

2020 ◽

pp. 108128652097184

Author(s):

Fabrizio Daví

Keyword(s):

Wave Propagation ◽

Point Group ◽

Dispersion Relations ◽

Exact Representation ◽

Qualitative Information ◽

Coupled Vibrations ◽

Tetragonal Crystals ◽

Lattice Wave

We study the coupled macroscopic and lattice wave propagation in anisotropic crystals seen as continua with affine microstructure (or micromorphic). In the general case, we obtain qualitative information on the frequencies and the dispersion relations. These results are then specialized to crystals of the tetragonal point group for various propagation directions: exact representation for the acoustic and optic frequencies and for the coupled vibrations modes are obtained for propagation directions along the tetragonal c-axis.

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