Sensitivity of helioseismic measurements of normal-mode coupling to flows and sound-speed perturbations

Research output: Contribution to journalArticle

Abstract

In this article, we derive and compute the sensitivity of measurements of coupling between normal modes of oscillation in the Sun to underlying flows. The theory is based on first-born perturbation theory, and the analysis is carried out using the formalism described by Lavely & Ritzwoller (1992). Albeit tedious, we detail the derivation and compute the sensitivity of specific pairs of coupled normal modes to anomalies in the interior. Indeed, these kernels are critical for the accurate inference of convective flow amplitudes and large-scale circulations in the solar interior.We resolve some inconsistencies in the derivation of Lavely & Ritzwoller (1992) and reformulate the fluid-continuity condition. We also derive and compute soundspeed kernels, paving the way for inverting for thermal anomalies alongside flows.

Original languageEnglish (US)
Article numberstx1298
Pages (from-to)1404-1420
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume470
Issue number2
DOIs
StatePublished - Sep 11 2017

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coupled modes
derivation
perturbation
anomalies
solar interior
acoustics
convective flow
inference
continuity
sun
perturbation theory
formalism
temperature anomaly
oscillations
fluids
sensitivity
oscillation
anomaly
fluid
speed

Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Sensitivity of helioseismic measurements of normal-mode coupling to flows and sound-speed perturbations. / Hanasoge, Shravan; Woodard, Martin; Antia, H. M.; Gizon, Laurent; Sreenivasan, Katepalli.

In: Monthly Notices of the Royal Astronomical Society, Vol. 470, No. 2, stx1298, 11.09.2017, p. 1404-1420.

Research output: Contribution to journalArticle

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