Proceedings of the International Astronomical Union

Contributed Papers

Thermally damped linear compressional waves in a 2D solar coronal model

A. Marcua1, I. Ballaia2 and B. Orzaa1

a1 Department of Theoretical and Computational Physics, Babes-Bolyai University, 1, M.Kogalniceanu, Cluj-Napoca, Romania

a2 SP2RC, Department of Applied Mathematics, University of Sheffield, Sheffield S3 7RH, UK email: amarc@phys.bbcluj.ro, i.ballai@sheffield.ac.uk

Abstract

The high resolution observations (TRACE and SOHO) of waves in coronal structures have revealed a rapid damping of modes, sometimes their damping length being of the same order as their wavelength. The rapid damping of modes in coronal loops permits us to derive values for magnetic field and transport coefficients. In this contribution we study the damping of linear compressional waves considering a two-dimensional propagation in gravitationally stratified plasma in the presence of thermal conduction. By considering this 2D model, we show that the presence of an additional transversal motion has an important effect on the damping of the waves. This theoretical model allows as to conclude that the main effects influencing the damping of the waves are the degree of the transversal structuring and temperature.

Keywords

  • waves;
  • damping;
  • thermal conduction;
  • Sun: atmosphere;
  • Sun: Corona