On the inference of supergranular flows by time-distance helioseismology

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16 Scopus citations


We have attempted to derive the internal flow fields of supergranules by inverting time-distance helioseismology measurements based on the ray theoretical approximation. Due to the "cross-talk" effect between the contributions of the vertical flows and horizontal divergent flows and also due to the measurement errors propagation in the inversion, we can derive reliably only the horizontal velocity distribution in the supergranules, but the vertical velocity which is much smaller than the horizontal velocity is rather uncertain. The preliminary results from our inversion show that the divergent flows extend to a few megameters below solar surface, and also present evidence of converging flows at the depth of ∼10 Mm. A simple estimation gives the average depth of supergranules is approximately 15 Mm. Another inversion technique Multi-Channel Deconvolution is also developed. The subsurface flow fields of a sunspot derived from this technique are compared with the results from algorithm LSQR, and a correlation of 95% and above is found.

Original languageEnglish (US)
Pages (from-to)417-420
Number of pages4
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number517
StatePublished - Feb 2003
Externally publishedYes
EventPIC7 - Geneva, Switzerland
Duration: Oct 30 2003Nov 3 2003

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science


  • Helioseismology
  • Inversions
  • Supergranules


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