A new look at mode conversion in a stratified isothermal atmosphere

AMD McDougall, Alan William Hood

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Recent numerical investigations of wave propagation near coronal magnetic null points (McLaughlin and Hood: Astron. Astrophys. 459, 641, 2006) have indicated how a fast MHD wave partially converts into a slow MHD wave as the disturbance passes from a low-beta plasma to a high-beta plasma. This is a complex process and a clear understanding of the conversion mechanism requires the detailed investigation of a simpler model. An investigation of mode conversion in a stratified, isothermal atmosphere with a uniform, vertical magnetic field is carried out, both numerically and analytically. In contrast to previous investigations of upward-propagating waves (Zhugzhda and Dzhalilov: Astron. Astrophys. 112, 16, 1982a; Cally: Astrophys. J. 548, 473, 2001), this paper studies the downward propagation of waves from a low-beta to high-beta environment. A simple expression for the amplitude of the transmitted wave is compared with the numerical solution.

Original languageEnglish
Pages (from-to)259-271
Number of pages13
JournalSolar Physics
Volume246
DOIs
Publication statusPublished - Nov 2007

Keywords

  • Sun : MHD oscillations
  • Sun : mode conversion
  • MAGNETIZED SOLAR ATMOSPHERE
  • WAVES
  • OSCILLATIONS
  • CHROMOSPHERE
  • FIELD

Fingerprint

Dive into the research topics of 'A new look at mode conversion in a stratified isothermal atmosphere'. Together they form a unique fingerprint.

Cite this