Comparison of large-scale flows on the sun measured by time-distance helioseismology and local correlation tracking

Michal Švanda, Junwei Zhao, Alexander G. Kosovichev

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

We present a direct comparison between two different techniques: time-distance helioseismology and a local correlation tracking method for measuring mass flows in the solar photosphere and in a near-surface layer. We applied both methods to the same dataset (MDI high-cadence Dopplergrams covering almost the entire Carrington rotation 1974) and compared the results. We found that, after necessary corrections, the vector flow fields obtained by these techniques are very similar. The median difference between directions of corresponding vectors is 24°, and the correlation coefficients of the results for mean zonal and meridional flows are 0.98 and 0.88, respectively. The largest discrepancies are found in areas of small velocities where the inaccuracies of the computed vectors play a significant role. The good agreement of these two methods increases confidence in the reliability of large-scale synoptic maps obtained by them.

Original languageEnglish (US)
Pages (from-to)27-37
Number of pages11
JournalSolar Physics
Volume241
Issue number1
DOIs
StatePublished - Mar 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Local correlation tracking
  • Sun: surface flows
  • Time-distance helioseismology

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