Physics
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007soph..241....7c&link_type=abstract
Solar Physics, Volume 241, Issue 1, pp.7-15
Physics
7
Solar Oscillations, Helioseismology, Waves
Scientific paper
The cross-correlation function of solar p modes in a time distance analysis changes with travel distance (or travel time). The exponential decrease in the amplitude of the cross-correlation function with travel distance has been interpreted as the dissipation of solar p-mode power and used to determine the lifetimes of high-degree p modes. It is found that the width of the cross-correlation function increases with travel distance. We interpret the increase in width as the dispersion of the wave packet in a time distance analysis. The dispersion would also cause a decrease in amplitude and affect the determination of lifetimes. We include the dispersion effect in the determination of lifetimes of high-degree p modes in a time distance analysis and find that the derived lifetime increases significantly compared with the previous study for degree less than 400.
Chou Dean-Yi
Ladenkov Oleg
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