Helioseismology of sub-photospheric flows

S. Shelyag, R. Erdélyi, M. J. Thompson

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Results of forward modelling of acoustic wave propagation in a realistic solar sub-photosphere with a steady horizontal flow are presented. The simulations are based on fully compressible ideal hydrodynamical modelling in a Cartesian grid. The initial model is characterised by solar density and pressure stratifications taken from standard solar Model S, adjusted to suppress convective instability. Acoustic waves are excited by a non-harmonic source located close to and right below the depth corresponding to the photosphere. A series of numerical experiments with coherent horizontal flows of various depths and speeds are carried out. The implemented flow field may mimick horizontal motions of plasma surrounding a sunspot (e.g. local analysis) or differential rotation (global analysis). The influence of steady state on the propagation of the sound waves through the solar interior is analyzed. Time-distance analysis is applied to compute the direct observational signatures of the background bulk motions on the travel times and phase shifts. This approach allows direct comparison with observational data.

Original languageEnglish
Title of host publicationSOHO 18/GONG 2006/HELAS I Beyond the spherical Sun
EditorsKaren Fletcher, Michael Thompson
Place of PublicationThe Netherlands
PublisherEuropean Space Agency (ESA Publications Division)
Number of pages4
ISBN (Print)9290929359, 9789290929352
Publication statusPublished - 2006
Externally publishedYes
EventSOHO 18/GONG 2006/HELAS I Beyond the spherical Sun - Sheffield, United Kingdom
Duration: 7 Aug 200611 Aug 2006

Publication series

NameEuropean Space Agency, (Special Publication) ESA SP
Volume624 SP
ISSN (Print)0379-6566


ConferenceSOHO 18/GONG 2006/HELAS I Beyond the spherical Sun
Country/TerritoryUnited Kingdom


  • Sun: helioseismology


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