Local helioseismology and correlation tracking analysis of surface structures in realistic simulations of solar convection

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dc.creatorGeorgobiani, Dali
dc.creatorZhao, Junwei
dc.creatorKosovichev, Alexander
dc.creatorBenson, David
dc.creatorStein, Robert F.
dc.creatorNordlund, Åke
dc.date2006-08-09
dc.date2007-01-31
dc.date.accessioned2026-07-07T10:23:25Z
dc.date.available2026-07-07T10:23:25Z
dc.descriptionWe apply time-distance helioseismology, local correlation tracking and Fourier spatial-temporal filtering methods to realistic supergranule scale simulations of solar convection and compare the results with high-resolution observations from the SOHO Michelson Doppler Imager (MDI). Our objective is to investigate the surface and sub-surface convective structures and test helioseismic measurements. The size and grid of the computational domain are sufficient to resolve various convective scales from granulation to supergranulation. The spatial velocity spectrum is approximately a power law for scales larger than granules, with a continuous decrease in velocity amplitude with increasing size. Aside from granulation no special scales exist, although a small enhancement in power at supergranulation scales can be seen. We calculate the time-distance diagram for f- and p-modes and show that it is consistent with the SOHO/MDI observations. From the simulation data we calculate travel time maps for surface gravity waves (f-mode). We also apply correlation tracking to the simulated vertical velocity in the photosphere to calculate the corresponding horizontal flows. We compare both of these to the actual large-scale (filtered) simulation velocities. All three methods reveal similar large scale convective patterns and provide an initial test of time-distance methods.
dc.description15 pages, 9 figures (.ps format); accepted to ApJ (tentatively scheduled to appear in March 10, 2007 n2 issue); included files ms.bbl, aabib.bst, aabib.sty, aastex.cls
dc.identifierhttps://arxiv.org/abs/astro-ph/0608204
dc.identifierhttp://arxiv.org/abs/astro-ph/0608204
dc.identifierAstrophys.J.657:1157-1161,2007
dc.identifierdoi:10.1086/511148
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/175819
dc.subjectAstrophysics
dc.titleLocal helioseismology and correlation tracking analysis of surface structures in realistic simulations of solar convection
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