Alfvén waves in simulations of solar photospheric vortices

Shelyag, Sergiy, Cally, PS, Reid, A and Mathioudakis, M 2013, Alfvén waves in simulations of solar photospheric vortices, Astrophysical journal letters, vol. 776, no. 1, pp. 1-4, doi: 10.1088/2041-8205/776/1/L4.

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Title Alfvén waves in simulations of solar photospheric vortices
Author(s) Shelyag, SergiyORCID iD for Shelyag, Sergiy
Cally, PS
Reid, A
Mathioudakis, M
Journal name Astrophysical journal letters
Volume number 776
Issue number 1
Article ID L4
Start page 1
End page 4
Total pages 4
Publisher IOP Publishing
Place of publication Bristol, Eng.
Publication date 2013-10-10
ISSN 2041-8205
Keyword(s) magnetohydrodynamics (MHD)
Sun: magnetic fields
Sun: photosphere
Science & Technology
Physical Sciences
Astronomy & Astrophysics
Summary Using advanced numerical magneto-hydrodynamic simulations of the magnetized solar photosphere, including non-gray radiative transport and a non-ideal equation of state, we analyze plasma motions in photospheric magnetic vortices. We demonstrate that apparent vortex-like motions in photospheric magnetic field concentrations do not exhibit "tornado"-like behavior or a "bath-tub" effect. While at each time instance the velocity field lines in the upper layers of the solar photosphere show swirls, the test particles moving with the time-dependent velocity field do not demonstrate such structures. Instead, they move in a wave-like fashion with rapidly changing and oscillating velocity field, determined mainly by magnetic tension in the magnetized intergranular downflows. Using time-distance diagrams, we identify horizontal motions in the magnetic flux tubes as torsional Alfvén perturbations propagating along the nearly vertical magnetic field lines with local Alfvén speed.
Language eng
DOI 10.1088/2041-8205/776/1/L4
Field of Research 0201 Astronomical And Space Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2013, The American Astronomical Society
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