Plasma Flow Generation due to the Nonlinear Alfvén Wave Propagation around a 3D Magnetic Null Point

Current density excitation has been studied around a 3D magnetic null point, the fan plane and also along the spine axis, including nite plasma pressure e ects. Current density generation in the presence of a plasma pressure, which is as barrier for developing current density, is not very well understood. The shock-capturing Godunov-type PLUTO code is used to solve the set of magnetohydrodynamic (MHD) equations to study the related wave-plasma energy transfer. It is shown that the propagation of Alfv en waves in the vicinity of a 3D magnetic null point leads to current density excitations along the spine axis and the magnetic null point. It is pointed out the x􀀀component of the current density has an oscillatory behaviour while the y􀀀 and z􀀀components don not show this property. This may happen because the fan plane separates unique topological regions while the spine axis does not have this characteristic and it is just a theoretical line not separating any topological regions. On turn, the current density generations result in plasma ows. It is found that the y􀀀component of the current density determines the x􀀀component of the plasma ow behaviour while the x􀀀component of the current density is related to the y􀀀component of the plasma ow behaviour.

Publication year:2021

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BOF-publication weight:3

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Authors:International

Authors from:Higher Education

Accessibility:Open