scholarly journals Mean magnetic field and noise cross-correlation in magnetohydrodynamic turbulence: results from a one-dimensional model

1999 ◽  
Vol 9 (4) ◽  
pp. 725-730 ◽  
Author(s):  
A. Basu ◽  
J.K. Bhattacharjee ◽  
S. Ramaswamy
Keyword(s):  
Magnetic Field ◽  
Cross Correlation ◽  
Dimensional Model ◽  
Magnetohydrodynamic Turbulence ◽  
One Dimensional ◽  
Noise Cross Correlation

The action of Vlasov waves on the velocity distribution in a plasma

1961 ◽  
Vol 10 (3) ◽  
pp. 473-479 ◽  
Author(s):  
J. W. Dungey
Keyword(s):  
Magnetic Field ◽  
Phase Space ◽  
Velocity Distribution ◽  
Thermal Equilibrium ◽  
Limited Range ◽  
Dimensional Model ◽  
One Dimensional ◽  
A Current

A one-dimensional model with no magnetic field is considered. It is supposed that the plasma starts in thermal equilibrium and then a current is forced to grow. Instability leads to the growth of waves, which are shown to stir the distribution in phase space, but only over a limited range of velocity. It is concluded that in order to restore stability the energy in the wave must become comparable to the energy of drift.

scholarly journals Inhomogeneity and velocity fields effects on scattering polarization in solar prominences

2014 ◽  
Vol 10 (S305) ◽  
pp. 238-244
Author(s):  
I. Milić ◽  
M. Faurobert
Keyword(s):  
Magnetic Field ◽  
Systematic Errors ◽  
Field Vector ◽  
Velocity Fields ◽  
Spectral Lines ◽  
Dimensional Model ◽  
Vector Magnetic Field ◽  
One Dimensional ◽  
Solar Prominences ◽  
The Magnetic Field

AbstractOne of the methods for diagnosing vector magnetic fields in solar prominences is the so called “inversion” of observed polarized spectral lines. This inversion usually assumes a fairly simple generative model and in this contribution we aim to study the possible systematic errors that are introduced by this assumption. On two-dimensional toy model of a prominence, we first demonstrate importance of multidimensional radiative transfer and horizontal inhomogeneities. These are able to induce a significant level of polarization in Stokes U, without the need for the magnetic field. We then compute emergent Stokes spectrum from a prominence which is pervaded by the vector magnetic field and use a simple, one-dimensional model to interpret these synthetic observations. We find that inferred values for the magnetic field vector generally differ from the original ones. Most importantly, the magnetic field might seem more inclined than it really is.

Two-temperature theory in generalized magneto-thermo-viscoelasticity

2009 ◽  
Vol 87 (4) ◽  
pp. 329-336 ◽  
Author(s):  
Magdy A. Ezzat ◽  
Alaa Abd El Bary ◽  
Ahmed S. El Karamany
Keyword(s):  
Magnetic Field ◽  
Specific Problem ◽  
Relaxation Times ◽  
Numerical Approach ◽  
Dimensional Model ◽  
State Space Approach ◽  
One Dimensional ◽  
The Laplace Transform ◽  
Two Temperature ◽  
Space Approach

A one-dimensional model of the two-temperature generalized magneto-viscoelasticity with two relaxation times in a perfect conducting medium is established. The state space approach is adopted for the solution of one-dimensional problems for any set of boundary conditions. The resulting formulation together with the Laplace transform techniques are applied to a specific problem of a half-space subjected to thermal shock and traction-free surface. The inversion of the Laplace transforms is carried out using a numerical approach. Numerical results are given and illustrated graphically for the problem. Some comparisons have been shown in figures to estimate the effects of the temperature discrepancy and the applied magnetic field.

Sign in / Sign up

Export Citation Format

Share Document