Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp31a23j&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP31A-23
Physics
7522 Helioseismology
Scientific paper
Inversions of Helioseismic Time-Distance data present unique views of the three-dimensional wave-speed variations in the solar interior. It has e.g. become possible to image the subsurface wave-speed structures beneath active regions and thus explore the magnetic activity of the sun in a new way. Since the solar oscillations have long wavelengths compared to the spatial extent of the features we wish to investigate, the ray approximation is inadequate in such imaging. We present inversions of Helioseismic Time-Distance data using non-ray-theoretical sensitivity kernels. The kernels are obtained using the Rytov approximation and have the so-called banana-doughnut shape. They are zero along the raypath and most of the sensitivity is located in an area corresponding to the first Fresnel zone around the ray. For the inversion we use a Fourier-domain based regularized least-squares method. We present results obtained using this inversion procedure, along with averaging kernels and error estimates of the results. We also present first results obtained using a SOLA inversion algorithm.
Christensen-Dalsgaard Joergen
Duvall Thomas L.
Holm Jacobsen Bo
Jensen Jesper Munk
Pijpers Frank P.
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