Local Helioseismology

Laurent Gizon
Stanford Solar Observatories Group
W. W. Hansen Experimental Physics Laboratory
455 Via Palou, Stanford University
Stanford, CA 94305-4085, U.S.A.
and
Max-Planck-Institut für Sonnensystemforschung
Max-Planck-Str. 2
D-37191 Katlenburg-Lindau, Germany

'External link'http://www.mps.mpg.de/

Aaron C. Birch
Colorado Research Associates
A division of NorthWest Research Associates, Inc.
3380 Mitchell Lane
Boulder, CO 80301-5410, U.S.A.

'External link'http://www.nwra.com/

Abstract

We review the current status of local helioseismology, covering both theoretical and observational results. After a brief introduction to solar oscillations and wave propagation through inhomogeneous media, we describe the main techniques of local helioseismology: Fourier–Hankel decomposition, ring-diagram analysis, time-distance helioseismology, helioseismic holography, and direct modeling. We discuss local helioseismology of large-scale flows, the solar-cycle dependence of these flows, perturbations associated with regions of magnetic activity, and solar supergranulation.


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