Numerical experiments on wave propagation towards a 3D null point due to rotational motions

Details Numerical experiments on wave propagation towards a 3D null point due to rotational motions Numerical experiments on wave propagation towards a 3D null point due to rotational motions

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1042g&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 108, Issue A1, pp. SSH 10-1, CiteID 1042, DOI 10.1029/2002JA009393

Astronomy and Astrophysics

Astrophysics

11

Mathematical Geophysics: Modeling, Mathematical Geophysics: Nonlinear Dynamics, Solar Physics, Astrophysics, And Astronomy: Magnetic Fields, And Astronomy: Corona

Scientific paper

We describe 3D resistive magnetohydrodynamic (MHD) numerical experiments at a null point driven by the rotation of magnetic field lines near the spine of the null. When field lines around the spine are rotated, a twist wave propagates toward the null along field lines, satisfying a Klein-Gordon equation. While the helical Alfvén wave spreads out as the null is approached, a fast-mode wave focuses on the null and wraps around it. Only a weak diffusion of the twisted field line structure is found to take place.

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