Time-Distance Helioseismology: Impact of Phase-Speed Filters on Travel-Time Measurements

Details Time-Distance Helioseismology: Impact of Phase-Speed Filters on Travel-Time Measurements Time-Distance Helioseismology: Impact of Phase-Speed Filters on Travel-Time Measurements

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp11b..01c&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP11B-01

Computer Science

Sound

7522 Helioseismology

Scientific paper

In time-distance helioseismology most procedures to compute travel-time maps use Gaussian phase-speed filters to select different parts of the wave propagation diagram. The mean phase speed of the filter is usually derived using ray theory and a solar model, but there is no obvious rule for choosing the width of the filter. We study how the filter widths impact travel-time measurements and show what widths give the best signal-to-noise ratio for measurements of sound-speed perturbations.

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