Time-Distance Helioseismology: Impact of Phase-Speed Filters on Travel-Time Measurements
Abstract
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.
- Publication:
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AGU Spring Meeting Abstracts
- Pub Date:
- May 2005
- Bibcode:
- 2005AGUSMSP11B..01C
- Keywords:
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- 7522 Helioseismology