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Fast magnetoacoustic wave trains in magnetic funnels of the solar corona View all abstracts by submitter

David James Pascoe   Submitted: 2013-10-31 21:01

Fast magnetoacoustic waves are highly dispersive in waveguides and so can generate quasi-periodic wave trains if a localised, impulsive driver is applied. Such wave trains have been observed in the solar corona and may be of use as a seismological tool since they depend upon the plasma structuring perpendicular to the direction of propagation. We extend existing models of magnetoacoustic waveguides to consider the effects of an expanding magnetic field. The funnel geometry employed includes a field-aligned density structure. We perform 2D numerical simulations of impulsively generated fast magnetoacoustic perturbations. The effects of the density contrast ratio, density stratification, and spectral profile of the driver upon the excited wave trains are investigated. The density structure acts as a dispersive waveguide for fast magnetoacoustic waves and generates a quasi-periodic wave train similar to previous models. The funnel geometry leads to the generation of additional wave trains which propagate outside the density structure. These newly discovered wave trains are formed by the leakage of transverse perturbations but propagate upwards due to refraction caused by the magnetic funnel. The results of our funnel model may be applicable to wave trains observed propagating in the solar corona which demonstrate similar properties to those found in our simulations.

Authors: D. J. Pascoe, V. M. Nakariakov, and E. G. Kupriyanova
Projects: None

Publication Status: A&A (accepted)
Last Modified: 2013-11-01 09:06
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