Acoustic scattering by flux tubes: Is the born approximation valid?

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

With the aim of studying magnetic effects in time-distance helioseismology, we use the first-order Born approximation to compute the scattering of acoustic plane waves by a magnetic cylinder embedded in a uniform medium. We show, by comparison with the exact solution, that the travel-time shifts computed in the Born approximation are everywhere valid to first order in the ratio of the magnetic to the gas pressures. For arbitrary magnetic field strength, the Born approximation is not valid in the limit where the radius of the magnetic cylinder tends to zero. This contribution is a summary of a paper published in the Astrophysical Journal.

Original languageEnglish (US)
Title of host publicationSOHO 18/GONG 2006/HELAS I Beyond the spherical Sun
Volume624 SP
StatePublished - Oct 1 2006
EventSOHO 18/GONG 2006/HELAS I Beyond the spherical Sun - Sheffield, United Kingdom
Duration: Aug 7 2006Aug 11 2006

Other

OtherSOHO 18/GONG 2006/HELAS I Beyond the spherical Sun
CountryUnited Kingdom
CitySheffield
Period8/7/068/11/06

Fingerprint

Born approximation
Acoustics
Scattering
Fluxes
Travel time
Magnetic fields
Gases

Keywords

  • Acoustics
  • Born approximation
  • Flux tubes

ASJC Scopus subject areas

  • Aerospace Engineering

Cite this

Gizon, L., Hanasoge, S., & Birch, A. C. (2006). Acoustic scattering by flux tubes: Is the born approximation valid? In SOHO 18/GONG 2006/HELAS I Beyond the spherical Sun (Vol. 624 SP)

Acoustic scattering by flux tubes : Is the born approximation valid? / Gizon, Laurent; Hanasoge, Shravan; Birch, A. C.

SOHO 18/GONG 2006/HELAS I Beyond the spherical Sun. Vol. 624 SP 2006.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Gizon, L, Hanasoge, S & Birch, AC 2006, Acoustic scattering by flux tubes: Is the born approximation valid? in SOHO 18/GONG 2006/HELAS I Beyond the spherical Sun. vol. 624 SP, SOHO 18/GONG 2006/HELAS I Beyond the spherical Sun, Sheffield, United Kingdom, 8/7/06.
Gizon L, Hanasoge S, Birch AC. Acoustic scattering by flux tubes: Is the born approximation valid? In SOHO 18/GONG 2006/HELAS I Beyond the spherical Sun. Vol. 624 SP. 2006
Gizon, Laurent ; Hanasoge, Shravan ; Birch, A. C. / Acoustic scattering by flux tubes : Is the born approximation valid?. SOHO 18/GONG 2006/HELAS I Beyond the spherical Sun. Vol. 624 SP 2006.
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