HR: 15:30h
AN: SP24A-01    [Abstracts]
TI: Comparison of Solar Subsurface Velocities Using Small-Scale Ring Analysis, Time-Distance and Holography
AU: * Haber, D A
EM: dhaber@solarz.colorado.edu
AF: JILA / University of Colorado, 440 - UCB, Boulder, CO 80309-0440 United States
AU: Featherstone, N A
EM: feathern@solarz.colorado.edu
AF: JILA / University of Colorado, 440 - UCB, Boulder, CO 80309-0440 United States
AU: Braun, D C
EM: dbraun@solar.stanford.edu
AF: North West Research Assoc. Inc. Colorado Res. Assoc. Div., 3380 Mitchell Lane, Boulder, CO 80301 United States
AU: Hindman, B W
EM: hindman@solarz.colorado.edu
AF: JILA / University of Colorado, 440 - UCB, Boulder, CO 80309-0440 United States
AU: Bogart, R S
EM: rbogart@spd.aas.org
AF: Stanford Univ., CSSA, HEPL Annex A202, Stanford, CA 94305-4085 United States
AB: For the first time we compare subsurface horizontal velocity flows determined by all three common local helioseismic analysis methods on a very small scale (approximately 1-2 degrees). Holographic and time-distance techniques have been compared on small scales, however, ring analysis techniques have mainly been performed with 15 degree size tiles spaced 7.5 degrees apart. Here we use tiles approximately 2 degrees in size with a spacing of 1 degree and compare the results with those of time-distance and holography. All three techniques have been applied to full-disc Doppler velocity data with 4" resolution (0.2 deg at disc center) taken with the Michelson Doppler Imager instrument aboard SOHO during Carrington Rotation 1988 in March-April of 2002.
DE: 7522 Helioseismology
SC: Solar Physics Division - AAS [SP]
MN: 2005 Joint Assembly