Dynamical response of magnetic tubes to transverse perturbations. II. Towards thin flux tubes.

Details Dynamical response of magnetic tubes to transverse perturbations. II. Towards thin flux tubes. Dynamical response of magnetic tubes to transverse perturbations. II. Towards thin flux tubes.

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...327..854z&link_type=abstract

Astronomy and Astrophysics, v.327, p.854-862

Astronomy and Astrophysics

Astrophysics

15

Mhd, Sun: Magnetic Fields, Magnetic Fields

Scientific paper

The dynamical response of magnetic flux tubes due to local transverse periodic perturbations is investigated by numerical means. Our aim was to check the applicability of the thin flux tube approximation for vertically oriented flux tubes with moderate magnetic field strength (plasma β=1) and diameters 100km, 50km and 25km immersed in an otherwise homogeneous nonmagnetic environment. All tubes has been subject to the same driver. To resolve the flux tube in a 2000x2000x1000km^3^ computational domain, a multiple nested grid version of a 3D MHD code is used. We find that a description as ideally thin flux tube becomes more and more questionable if the diameter of the tube decreases. For the thinnest tube we found eg. an almost complete split up into a fork-like geometry with two counterrotating legs. This can be explained by a more rigorous interaction of the tube with the ambient medium: Geometrically thinner flux tubes are less inert than corresponding thick tubes and therefore experience stronger backreaction forces because thinner tubes are easier to displace horizontally. As a consequence of this, their cross sections are significantly deformed contradictory to the assumptions made in the thin flux tube approximation. The energy loss from the internal tube motions to the surroundings by acoustic radiation is found to be anticorrelated with the tube radius ie. thinner tubes loose more wave energy than thicker ones.

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