HR: 0830h
AN: SP11B-01    [Abstracts]
TI: Time-Distance Helioseismology: Impact of Phase-Speed Filters on Travel-Time Measurements
AU: * Couvidat, S
EM: couvidat@stanford.edu
AF: W.W. Hansen Experimental Physics Laboratory, Stanford University, 455 Via Palou, Stanford, CA 94305-4085 United States
AU: Birch, A C
EM: aaronb@cora.nwra.com
AF: Colorado Research Associates, NorthWest Research Associates, Inc., 3380 Mitchell Lane, Boulder, CO 80301 United States
AU: Gizon, L
EM: lgizon@solar.stanford.edu
AF: MPI fuer Sonnensystemforschung, Max-Planck-Str. 2, Katlenburg-Lindau, 37191 Germany
AB: 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.
DE: 7522 Helioseismology
SC: Solar Physics Division - AAS [SP]
MN: 2005 Joint Assembly