Affordable Access

Access to the full text

Determination of the cross-field density structuring in coronal waveguides using the damping of transverse waves

Authors
  • Arregui, I.
  • Ramos, A. Asensio
Type
Preprint
Publication Date
Apr 02, 2014
Submission Date
Apr 02, 2014
Identifiers
DOI: 10.1051/0004-6361/201423536
Source
arXiv
License
Yellow
External links

Abstract

Time and spatial damping of transverse magnetohydrodynamic (MHD) kink oscillations is a source of information on the cross-field variation of the plasma density in coronal waveguides. We show that a probabilistic approach to the problem of determining the density structuring from the observed damping of transverse oscillations enables us to obtain information on the two parameters that characterise the cross-field density profile. The inference is performed by computing the marginal posterior distributions for density contrast and transverse inhomo- geneity length-scale using Bayesian analysis and damping ratios for transverse oscillations under the assumption that damping is produced by resonant absorption. The obtained distributions show that, for damping times of a few oscillatory periods, low density contrasts and short inho- mogeneity length scales are more plausible in explaining observations. This means that valuable information on the cross-field density profile can be obtained even if the inversion problem, with two unknowns and one observable, is a mathematically ill-posed problem.

Report this publication

Statistics

Seen <100 times