Tornado model for a magnetised plasma | Zendy

O. G. Onishchenko | Zendy; V. Fedun | Zendy; A. I. Smolyakov | Zendy; W. Horton | Zendy; O. A. Pokhotelov | Zendy; G. Verth | Zendy

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Tornado model for a magnetised plasma

Author(s) -

O. G. Onishchenko,

V. Fedun,

A. I. Smolyakov,

W. Horton,

O. A. Pokhotelov,

G. Verth

Publication year - 2018

Publication title -

physics of plasmas

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.75

H-Index - 160

eISSN - 1089-7674

pISSN - 1070-664X

DOI - 10.1063/1.5023167

Subject(s) - physics , vortex , magnetohydrodynamic drive , magnetohydrodynamics , magnetic field , mechanics , classical mechanics , vorticity , plasma , advection , axial symmetry , quantum mechanics , thermodynamics

A new analytical model of axially-symmetric magnetic vortices with both a twisted fluid flow and a magnetic field is proposed. The exact solution for the three-dimensional structure of the fluid velocity and the magnetic field is obtained within the framework of the ideal magnetohydrodynamic equations for an incompressible fluid in a gravitational field. A quasi-stationary localised vortex arises when the radial flow that tends to concentrate vorticity in a narrow column around the axis of symmetry is balanced by the vertical vortex advection in the axial direction. The explicit expressions for the velocity and magnetic field components are obtained. The proposed analytic model may be used to parameterise the observed solar tornadoes and can provide a new indirect way for estimating magnetic twist from the observed azimuthal velocity profiles.

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