Effects of Dispersion of Wave Packets in the Determination of Lifetimes of High-Degree Solar p Modes from Time Distance Analysis: TON Data

Details Effects of Dispersion of Wave Packets in the Determination of Lifetimes of High-Degree Solar p Modes from Time Distance Analysis: TON Data Effects of Dispersion of Wave Packets in the Determination of Lifetimes of High-Degree Solar p Modes from Time Distance Analysis: TON Data

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007soph..241...17b&link_type=abstract

Solar Physics, Volume 241, Issue 1, pp.17-25

Physics

8

Scientific paper

We use the method of time distance analysis to measure lifetimes of solar p modes in the range ℓ=100 - 600 and ν=3.0 - 4.5 mHz with data taken with the Taiwan Oscillation Network (TON). The lifetimes of p modes are determined by the changes in the amplitude and width of the cross-correlation function of a wave packet with the number of skips. The amplitude of the cross-correlation function decreases exponentially with the number of skips as in previous work. This decrease has been interpreted as the effect of the finite p-mode lifetime. In this study, we find that the width of the cross-correlation function increases with the number of skips. We interpret this phenomenon as the effect of the dispersion of the wave packet. We include this effect in the determination of the lifetime of the wave packet. The lifetime increases after the dispersion is taken into account. We also study the change in lifetime between solar minimum and maximum.

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