Results 121 to 130 of about 31,268 (166)
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Radio Science, 1975
The dispersion relation of gravity waves propagating in a conducting atmosphere in the presence of a magnetic field has been evaluated. Extreme simplifying assumptions have been adopted in an effort to reach simple results. In this way, the applicability of the results to any real situation is highly doubtful.
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The dispersion relation of gravity waves propagating in a conducting atmosphere in the presence of a magnetic field has been evaluated. Extreme simplifying assumptions have been adopted in an effort to reach simple results. In this way, the applicability of the results to any real situation is highly doubtful.
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MHD simple waves and the divergence wave
AIP Conference Proceedings, 2010In this paper we investigate magnetohydrodynamic (MHD) simple divergence waves in MHD, for models in which ∇⋅B≠0. These models are related to the eight wave Riemann solvers in numerical MHD, in which the eighth wave is the divergence wave associated with ∇⋅B≠0. For simple wave solutions, all physical variables (the gas density, pressure, fluid velocity,
G. M. Webb +7 more
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2009
Analyzing the structure of solar coronal loops is crucial to our understanding of the processes that heat and maintain the coronal plasma at multimillion degree temperatures. The determination of the physical parameters of coronal loops remains both an observational and theoretical challenge.
Y. Taroyan, R. Erdélyi
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Analyzing the structure of solar coronal loops is crucial to our understanding of the processes that heat and maintain the coronal plasma at multimillion degree temperatures. The determination of the physical parameters of coronal loops remains both an observational and theoretical challenge.
Y. Taroyan, R. Erdélyi
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Heating Diagnostics with MHD Waves
Space Science Reviews, 2009The heating of the solar atmosphere is a fundamental problem of modern solar and astrophysics. A review of the seismological aspects of magnetohydrodynamic (MHD) waves with an emphasis on standing longitudinal waves in the context of coronal heating is presented.
Y. Taroyan, R. Erdélyi
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Experimental Evidence of MHD Surface Waves
Physical Review Letters, 1986MND surface waves of m = -1 (poloidal mode number of left-hand rotation) compressional Alfven waves in a cylindrical finite-..beta.. plasma have been observed for the first time to propagate together with shear Alfven waves. These modes also show a distinctive feature of the dispersion merging with that of shear Alfven waves at the center of a plasma ...
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Multi-dimensional MHD simple waves
AIP Conference Proceedings, 1996In this paper we consider a formalism for multi-dimensional simple MHD waves using ideas developed by Boillat. For simple wave solutions one assumes that all the physical variables (the density rho, gas pressure p, fluid velocity V, gas entropy S, and magnetic induction B in the MHD case) depend on a single phase function phi(r,t).
G. M. Webb +3 more
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Nonlinear MHD Waves and Discontinuities
2012Linear waves considered in Chap. 2 describe perturbations with small amplitudes. In the astrophysical conditions, however, a strong energy release gives often rise to large-amplitude perturbations, which cannot be fully accommodated by the linear theory and so require non-linear treatment.
Gregory D. Fleishman, Igor N. Toptygin
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MHD CHARACTERISTICS AND SHOCK WAVES
1964Abstract : A review of the theory of MHD characteristics and shock waves is presented. Primary emphasis is placed on a physical discussion of the three characteristic modes and the jump conditions for the two types of shock waves which can exist. Brief discussions of shock structure, applications of the theory, and the range of applicability of the ...
H. E. Petschek, A. R. Kantrowitz
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Nonlinear wave interactions for ideal MHD plasmas
Nonlinearity, 1999Summary: The theory for resonant three-wave interactions in anisotropic and inhomogeneous MHD plasmas is extended. Using a Hamiltonian formalism, we derive symmetric coupling coefficients, relevant for a class of MHD models with anisotropic pressures.
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2000
Magnetohydrodynamic waves create turbulence, nonlinearly cascade in a wide range of wavenumbers, accelerate particles and produce a lot of effects in cosmic plasma.
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Magnetohydrodynamic waves create turbulence, nonlinearly cascade in a wide range of wavenumbers, accelerate particles and produce a lot of effects in cosmic plasma.
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