%0 Journal Article
%T Plasma Evolutions Around a Solar Coronal 3D Magnetic Null Point
%J Iranian Journal of Astronomy and Astrophysics
%I Damghan University
Astronomical Society of Iran
%Z 2322-4924
%A Sabri, Somaiyeh
%A Ebadi, Hossein
%D 2021
%\ 07/01/2021
%V 8
%N 2
%P 63-69
%! Plasma Evolutions Around a Solar Coronal 3D Magnetic Null Point
%K Magnetohydrodynamics
%K Alfven wave
%K PLUTO code
%K magnetic null point
%R 10.22128/ijaa.2021.516.1115
%X It is investigated how the plasma evaluates due to the propagation of the nonlinear Alfven wave. Magnetic null points that are detected in the solar corona have 3D structures which are prevalent in the solar atmosphere. In this study, we consider the real 3D structure with a 3D magnetic null point. The shock-capturing Godunovtype PLUTO code is used to solve the resistive magnetohydrodynamic (MHD) set of equations in the context of wave-plasma energy transfer to find out how the plasma evaluates. An initially symmetric Alfv´en pulse at a specific distance from a magnetic null-point is kicked towards the isothermal null-point. Alfven wave propagation around a 3D magnetic null point results in magnetoacoustic waves perturbations which propagate towards the null point and refracts around the null point.It is found that nonlinear Alfven wave propagation around a 3D magnetic null point results in plasma density perturbations due to the compressible magnetoacoustic waves perturbations.
%U https://ijaa.du.ac.ir/article_255_fea317a6c0d6b1a6af4817781698489e.pdf