Magnetic swirls and associated fast magnetoacoustic kink waves in a solar chromospheric flux tube 

Błażej Kuźma Submitted: 20171024 04:22
We perform numerical simulations of impulsively generated magnetic swirls in an isolated flux tube which is rooted in the solar photosphere.
These swirls are triggered by an initial pulse in a horizontal component of the velocity.
The initial pulse is launched either: (a) centrally, within the localized magnetic flux tube; or (b) offcentral, in the ambient medium.
The evolution and dynamics of the flux tube is described by threedimensional, ideal magnetohydrodynamic equations.
These equations are numerically solved to reveal that in case (a) dipolelike swirls associated with the fast magnetoacoustic kink and m=1 Alfvén waves are generated.
In case (b), the fast magnetoacoustic kink and m=0 Alfvén modes are excited.
In both these cases, the excited fast magnetoacoustic kink and Alfvén waves consist of similar flow pattern and
magnetic shells are also generated with clockwise and counterclockwise rotating plasma within them, which can be the proxy of dipoleshaped chromospheric swirls.
The complex dynamics of vortices and wave perturbations reveals
the channelling of sufficient amount of energy to fulfill energy losses in the chromosphere (~ 10^{4} W m^{1}) and in the
corona (~ 10^{2} W m^{1}).
Some of these numerical findings are reminiscent of signatures in recent observational data.
Authors: K. Murawski, P. Kayshap, A. K. Srivastava, D. J. Pascoe, P. Jelínek, B. Kuźma, V. Fedun
Projects: None

Publication Status: Mon. Not. R. Astron. Soc. (accepted)
Last Modified: 20171024 11:57


