Effect of nonlinear interactions on p-mode frequencies and line widths

Details Effect of nonlinear interactions on p-mode frequencies and line widths Effect of nonlinear interactions on p-mode frequencies and line widths

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427..483k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 427, no. 1, p. 483-496

Astronomy and Astrophysics

Astrophysics

4

Energy Spectra, Gravitational Fields, Hamiltonian Functions, Mathematical Models, Stellar Models, Chromosphere, Frequency Shift, Solar Granulation, Stellar Magnitude

Scientific paper

We calculate the effect of nonlinear interactions among solar acoustic modes upon the modal frequencies and energy loss rates (or line widths). The frequency shift for a radial p-mode of frequency 3 mHz is found to be about -0.5 microHz. The magnitude of nonlinear frequency shift increases more rapidly with frequency than the inverse mode mass (mode mass is defined as the ratio of energy in the mode to its surface velocity amplitude squared). This frequency shift is primarily due to nonresonant three-mode interactions and is dominated by high l surface gravity waves (f-modes) and p-modes. The line width of a radial p-mode of frequency 3 mHz, due to resonant nonlinear interactions, is about 0.3 microHz. This result is consistent with that of Kumar and Goldreich (1989). We also find, in agreement with these authors, that the most important nonlinear interactions of trapped p-modes involve f-modes and high-frequency p-modes (frequency greater than about 5 mHz) which propagate in the solar photosphere. Thus, using the arguments advanced by Kumar & Goldreich (1989), we conclude that nonlinear couplings cannot saturate the overstable solar p-modes at their small observed amplitudes. Both the nonlinear frequency shifts and line widths, at a fixed frequency, are proportional to the inverse of mode mass which for modes of degree greater than about 100 is approximately l0.8. Therefore, the frequency of an f-mode of l = 1000, due to nonlinear interactions, is decreased by approximately 0.4%.

Affiliated with

Also associated with

No associations

Rating

Effect of nonlinear interactions on p-mode frequencies and line widths does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Effect of nonlinear interactions on p-mode frequencies and line widths, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effect of nonlinear interactions on p-mode frequencies and line widths will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-885279