搜索结果: 1-15 共查到“地球物理学 MHD”相关记录24条 . 查询时间(0.069 秒)
Structure function measurements of the intermittent MHD turbulent cascade
Structure function measurements intermittent MHD turbulent cascade
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2009/11/13
The intertmittent nature of turbulence within solar wind plasma has been demonstrated by several studies of spacecraft data. Using magnetic field data taken in high speed flows at high heliographic la...
Intermittency,non-Gaussian statistics and fractal scaling of MHD fluctuations in the solar wind
Intermittency,non-Gaussian statistics fractal scaling MHD fluctuations solar wind
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2009/11/13
This paper gives a review of some recent work on intermittency, non-Gaussian statistics, and fractal scaling of solar wind magnetohydrodynamic turbulence. Model calculations and theories are discussed...
Three-wave coupling in a stratified MHD plasma
Three-wave coupling stratified MHD plasma
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2009/11/13
A general coupling coefficient for three wave interactions in an ideal MHD plasma is presented. Using a special stratified background atmosphere, an explicit symmetric form of the coupling coefficient...
Localized Alfvénic solutions of nondissipative and compressible MHD
Localized Alfvénic solutions nondissipative and compressible MHD
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2009/11/13
Alfvénic solutions of nondissipative MHD are entirely determined by their magnetic configuration. With the supplementary assumption of incompressibility any solenoidal field can be used to construct a...
MHD effects of the solar wind flow around planets
MHD effects solar wind planets
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2009/11/13
The study of the interaction of the solar wind with magnetized and unmagnetized planets forms a central topic of space research. Focussing on planetary magnetosheaths, we review some major development...
Euler potentials for the MHD Kamchatnov-Hopf soliton solution
Euler potentials MHD Kamchatnov-Hopf soliton solution
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2009/11/12
In the MHD description of plasma phenomena the concept of magnetic helicity turns out to be very useful. We present here an example of introducing Euler potentials into a topological MHD soliton which...
Effects of MHD slow shocks propagating along magnetic flux tubes in a dipole magnetic field
MHD slow shocks magnetic flux tubes dipole magnetic field
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2009/11/12
Variations of the plasma pressure in a magnetic flux tube can produce MHD waves evolving into shocks. In the case of a low plasma beta, plasma pressure pulses in the magnetic flux tube generate MHD sl...
Two-dimensional MHD model of the reconnection diffusion region
Two-dimensional MHD model reconnection diffusion region
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2009/11/12
Magnetic reconnection is an important process providing a fast conversion of magnetic energy into thermal and kinetic plasma energy. In this concern, a key problem is that of the resistive diffusion r...
Dynamics of nonlinear resonant slow MHD waves in twisted flux tubes
nonlinear resonant slow MHD waves twisted flux tubes
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2009/11/12
Nonlinear resonant magnetohydrodynamic (MHD) waves are studied in weakly dissipative isotropic plasmas in cylindrical geometry. This geometry is suitable and is needed when one intends to study resona...
MHD turbulence and heating of the open field-line solar corona
MHD turbulence open field-line solar corona
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2009/11/11
This paper discusses the possibility that heating of the solar corona in open field-line regions emanating from coronal holes is due to a nonlinear cascade, driven by low-frequency or quasi-static mag...
Direct numerical simulations of helical dynamo action:MHD and beyond
Direct numerical simulations helical dynamo action MHD and beyond
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2009/11/11
Magnetohydrodynamic dynamo action is often invoked to explain the existence of magnetic fields in several astronomical objects. In this work, we present direct numerical simulations of MHD helical dyn...
Excitation of kinetic Alfvén turbulence by MHD waves and energization of space plasmas
kinetic Alfvén turbulence MHD waves energization of space plasmas
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2009/11/11
There is abundant observational evidence that the energization of plasma particles in space is correlated with an enhanced activity of large-scale MHD waves. Since these waves cannot interact with par...
A fluid description for Landau damping of dispersive MHD waves
fluid description Landau damping dispersive MHD waves
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2009/11/11
The dynamics of long oblique MHD waves in a collisionless plasma permeated by a uniform magnetic field is addressed using a Landau-fluid model that includes Hall effect and electron-pressure gradient ...
Intermittency in MHD turbulence and coronal nanoflares modelling
Intermittency MHD turbulence coronal nanoflares modelling
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2009/11/9
High resolution numerical simulations, solar wind data analysis, and measurements at the edges of laboratory plasma devices have allowed for a huge progress in our understanding of MHD turbulence. The...
Intermittent heating of the solar corona by MHD turbulence
Intermittent heating solar corona MHD turbulence
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2009/11/3
As the dissipation mechanisms considered for the heating of the solar corona would be sufficiently efficient only in the presence of small scales, turbulence is thought to be a key player in the coron...