Additional Evidence Supporting a Model of Shallow, High-Speed Supergranulation

T. L. Duvall, Shravan Hanasoge, S. Chakraborty

Research output: Contribution to journalArticle

Abstract

Recently, Duvall and Hanasoge (Solar Phys. 287, 71, 2013) found that large-distance separation [Δ] travel-time differences from a center to an annulus [δtoi] implied a model of the average supergranular cell that has a peak upflow of 240 m s-1 at a depth of 2.3 Mm and a corresponding peak outward horizontal flow of 700 m s-1 at a depth of 1.6 Mm. In the present work, this effect is further studied by measuring and modeling center-to-quadrant travel-time differences [δtqu], which roughly agree with this model. Simulations are analyzed that show that such a model flow would lead to the expected travel-time differences. As a check for possible systematic errors, the center-to-annulus travel-time differences [δtoi] are found not to vary with heliocentric angle. A consistency check finds an increase of δtoi with the temporal frequency [ν] by a factor of two, which is not predicted by the ray theory.

Original languageEnglish (US)
Pages (from-to)3421-3433
Number of pages13
JournalSolar Physics
Volume289
Issue number9
DOIs
StatePublished - Jan 1 2014

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travel time
travel
high speed
annuli
quadrants
systematic errors
rays
speed
cells
modeling
simulation

Keywords

  • Helioseismology, direct modeling
  • Helioseismology, observations
  • Interior, convective zone
  • Supergranulation
  • Velocity fields, interior

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Additional Evidence Supporting a Model of Shallow, High-Speed Supergranulation. / Duvall, T. L.; Hanasoge, Shravan; Chakraborty, S.

In: Solar Physics, Vol. 289, No. 9, 01.01.2014, p. 3421-3433.

Research output: Contribution to journalArticle

Duvall, T. L. ; Hanasoge, Shravan ; Chakraborty, S. / Additional Evidence Supporting a Model of Shallow, High-Speed Supergranulation. In: Solar Physics. 2014 ; Vol. 289, No. 9. pp. 3421-3433.
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