### 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 language | English (US) |
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Title of host publication | SOHO 18/GONG 2006/HELAS I Beyond the spherical Sun |

Volume | 624 SP |

State | Published - Oct 1 2006 |

Event | SOHO 18/GONG 2006/HELAS I Beyond the spherical Sun - Sheffield, United Kingdom Duration: Aug 7 2006 → Aug 11 2006 |

### Other

Other | SOHO 18/GONG 2006/HELAS I Beyond the spherical Sun |
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Country | United Kingdom |

City | Sheffield |

Period | 8/7/06 → 8/11/06 |

### Fingerprint

### Keywords

- Acoustics
- Born approximation
- Flux tubes

### ASJC Scopus subject areas

- Aerospace Engineering

### Cite this

*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.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*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.

}

TY - GEN

T1 - Acoustic scattering by flux tubes

T2 - Is the born approximation valid?

AU - Gizon, Laurent

AU - Hanasoge, Shravan

AU - Birch, A. C.

PY - 2006/10/1

Y1 - 2006/10/1

N2 - 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.

AB - 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.

KW - Acoustics

KW - Born approximation

KW - Flux tubes

UR - http://www.scopus.com/inward/record.url?scp=33847380698&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33847380698&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:33847380698

SN - 9290929359

SN - 9789290929352

VL - 624 SP

BT - SOHO 18/GONG 2006/HELAS I Beyond the spherical Sun

ER -