Multiple scattering of waves by a pair of gravitationally stratified flux tubes

Shravan Hanasoge, Paul S. Cally

Research output: Contribution to journalArticle

Abstract

We study the near-field coupling of a pair of flux tubes embedded in a gravitationally stratified environment. The mutual induction of the near-field jackets of the two flux tubes can considerably alter the scattering properties of the system, resulting in sizable changes in the magnitudes of scattering coefficients and bizarre trends in the phases. The dominant length scale governing the induction zone turns out to be approximately half the horizontal wavelength of the incident mode, a result that fits in quite pleasantly with extant theories of scattering. Higher-β flux tubes are more strongly coupled than weaker ones, a consequence of the greater role that the near-field jacket modes play in such tubes. We also comment on the importance of incorporating the effects of multiple scattering when studying the effects of mode absorption in plage and interpreting related scattering measurements. That the near field plays such an important role in the scattering process lends encouragement to the eventual goal of observationally resolving subwavelength features of flux tubes using techniques of helioseismology.

Original languageEnglish (US)
Pages (from-to)651-659
Number of pages9
JournalAstrophysical Journal
Volume697
Issue number1
DOIs
StatePublished - Jan 1 2009

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scattering
tubes
near fields
jackets
induction
faculae
helioseismology
scattering coefficients
trends
wavelength
wavelengths
effect

Keywords

  • Hydrodynamics
  • Sun: helioseismology
  • Sun: interior
  • Sun: oscillations
  • Waves

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics
  • Nuclear and High Energy Physics

Cite this

Multiple scattering of waves by a pair of gravitationally stratified flux tubes. / Hanasoge, Shravan; Cally, Paul S.

In: Astrophysical Journal, Vol. 697, No. 1, 01.01.2009, p. 651-659.

Research output: Contribution to journalArticle

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