Coupling a Global Heliospheric Magnetohydrodynamic Model to a Magnetofrictional Model of the Low Corona

2021 ◽  
Vol 254 (1) ◽  
pp. 1
Author(s):  
Keiji Hayashi ◽  
William P. Abbett ◽  
Mark C. M. Cheung ◽  
George H. Fisher
Keyword(s):  
Magnetohydrodynamic Model

Comment on “Stepped pressure profile equilibria in cylindrical plasmas via partial Taylor relaxation” [J. Plasma Physics (2006), vol. 72, part 6, pp. 1167–1171]

2021 ◽  
Vol 87 (2) ◽  
Author(s):  
Yuanfan Wang ◽  
Dhairya Malhotra ◽  
Antoine J. Cerfon
Keyword(s):  
Plasma Physics ◽  
Pressure Profile ◽  
Surface Currents ◽  
Magnetohydrodynamic Model ◽  
Taylor Relaxation

In an early study of the properties and capabilities of the multiregion, relaxed magnetohydrodynamic model, Hole, Hudson & Dewar claim that they are able to construct a multiregion stepped pressure cylindrical equilibrium which does not require the existence of surface currents. We present a brief argument showing that this claim is incorrect, and clarify the meaning of their statement. Furthermore, even with the statement clarified, we demonstrate that it is not possible to find solutions to reproduce the equilibrium corresponding to the parameters given in the article. We invite the authors to provide a corrigendum with the correct values of the equilibrium they constructed.

Magnetoacoustic Nonlinear Solitary and Freak Waves in Pair-Ion Plasma

2019 ◽  
Vol 74 (9) ◽  
pp. 777-786 ◽  
Author(s):  
Papihra Sethi ◽  
Kuldeep Singh ◽  
N.S. Saini
Keyword(s):  
Solitary Wave Solution ◽  
Reductive Perturbation Method ◽  
Number Density ◽  
Kp Equation ◽  
Temperature Ratio ◽  
Plasma Parameters ◽  
Freak Waves ◽  
Positive Ions ◽  
Ion Plasma ◽  
Magnetohydrodynamic Model

AbstractAn investigation of magnetoacoustic nonlinear solitary and freak waves in a magnetised collisionless pair-ion plasma using two-dimensional magnetohydrodynamic model is presented. The reductive perturbation method is used to obtain the Kadomtsev–Petviashvili (KP) equation. The solitary wave solution of KP equation is examined. Further, on modulating KP equation, the nonlinear Schrödinger equation is derived with the help of appropriate transformation. The influence of various plasma parameters such as magnetic field strength, number density of ions, and temperature ratio of negative to positive ions, etc. on the propagation characteristics of solitary waves and first- as well as second-order magnetoacoustic freak waves in pair-ion plasma is examined.

A comprehensive magnetohydrodynamic model of the Venus ionosphere

1991 ◽  
Vol 96 (A7) ◽  
pp. 11083 ◽  
Author(s):  
H. Shinagawa ◽  
J. Kim ◽  
A. F. Nagy ◽  
T. E. Cravens
Keyword(s):  
Magnetohydrodynamic Model

scholarly journals Resistive evolution of a force-free plasma to equilibrium

1991 ◽  
Vol 46 (3) ◽  
pp. 437-457
Author(s):  
A. S. Gill ◽  
E. W. Laing
Keyword(s):  
Critical Aspect ◽  
Axial Flux ◽  
Relaxation Theory ◽  
Field Diffusion ◽  
Resistive Plasma ◽  
Maximum Current ◽  
Equilibrium Profiles ◽  
Reversed Field ◽  
Magnetohydrodynamic Model ◽  
Free Plasma

Using the magnetohydrodynamic model, the evolution of a resistive plasma can be represented as a relaxation through a sequence of force-free equilibrium states. We show, by extending existing work, that this process is equivalent to magnetic field diffusion in a strongly anisotropie static conductor. The latter evolution is easier to simulate numerically, and is carried out for laboratory based plasmas confined in cylinders and toroids. We obtain a variety of universal equilibrium profiles that are consistent with experiment and relaxation theory and that predict the existence of states arising in reversed-field pinches. The existence of a critical axial flux is predicted about which there exist stable modes of operation corresponding to high and low current. We also show the existence of a critical aspect ratio at which it is most desirable to build toroidal devices. This corresponds to the value at which maximum current, for a fixed driving field, can be generated.

Two-dimensional magnetohydrodynamic model of emerging magnetic flux in the solar atmosphere

1989 ◽  
Vol 345 ◽  
pp. 584 ◽  
Author(s):  
K. Shibata ◽  
T. Tajima ◽  
R. S. Steinolfson ◽  
R. Matsumoto
Keyword(s):  
Magnetic Flux ◽  
Solar Atmosphere ◽  
Two Dimensional ◽  
Magnetohydrodynamic Model
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