Lifetimes of High-l Solar p-Modes from Time-Distance Analysis

Details Lifetimes of High-l Solar p-Modes from Time-Distance Analysis Lifetimes of High-l Solar p-Modes from Time-Distance Analysis

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...554l.229c&link_type=abstract

The Astrophysical Journal, Volume 554, Issue 2, pp. L229-L231.

Astronomy and Astrophysics

Astronomy

7

Sun: Atmosphere, Sun: Interior, Sun: Oscillations, Waves

Scientific paper

The amplitude of the cross-correlation function of solar p-modes in time-distance analysis decreases exponentially with travel distance (or travel time). We interpret this phenomenon as the dissipation of solar p-mode power and use the rate of decrease in the amplitude of the cross-correlation function to determine the lifetime of high-degree solar p-modes that cannot be accurately determined from the conventional method, measurements of line widths of p-mode power spectra, because of mode mixture. In this study, we determine the lifetimes of p-modes in the range l=200-600 and ν=2.5-5.5 mHz, where l is the spherical harmonic degree and ν is the frequency. The lifetime decreases with l for frequency less than about 4.7 mHz. For a fixed l, the frequency dependence has a general trend: the lifetime is approximately constant at intermediate frequency and decreases at high frequency.

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