Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp31a20k&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP31A-20
Astronomy and Astrophysics
Astrophysics
7500 Solar Physics, Astrophysics, And Astronomy, 7522 Helioseismology
Scientific paper
Time-distance analysis is emerging as a powerful diagnostic tool in local helioseismology. By directly measuring propagation times of wave packets between selected locations at the surface of the sun, and their variations over specific areas, a directed diagnostic of the physical properties of the region below these areas can be achieved. We present and discuss inversion methodologies specific to time-distance analysis. These have been optimized for sparse matrices, and include error-bar computation as well as resolution kernel estimation. Our inversion methodology for velocity flow allow us to impose a mass-conservation constrain. We show the diagnostic potential of time-distance inversion and its limitation with various simulations. We illustrate the inversion resolving power potential and discuss the trade-off between resolution and error magnification, including the effect of imposing mass-conservation for velocity flow inferences. We also show inferences from actual observations obtained with the MDI experiment on board the SOHO spacecraft.
Eff-Darwich Antonio
Korzennik Sylvain G.
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