Volume 387, Number 1, May III 2002
|Page(s)||335 - 338|
|Section||Planets and planetary systems|
|Published online||15 May 2002|
Influence of wave noise on frequencies and amplitudes of the solar -modes
Department of Complex Physical Systems, Institute of Physics, UMCS, ul. Radziszewskiego 10, 20-031 Lublin, Poland
2 Institute of Atomic and Molecular Physics, National Research Council, Via Moruzzi 1, 56124 Pisa, Italy
3 Institute of Applied Physics, 46 Ul'anova Street 603600, Nizhny Novgorod, Russia
Corresponding author: K. Murawski, firstname.lastname@example.org
Accepted: 12 March 2002
The influence of space- and time-dependent random mass density field, associated with granules, on frequencies and amplitudes of the solar p-modes is examined in the limit of weak random fields and small amplitude oscillations. The p-modes are approximated by the sound waves which propagate in the gravity-free medium. Using a perturbative method, we derive a dispersion relation which is solved for the case of wave noise for which the spectrum , where δ is the Dirac's delta-function and cr is the random phase speed. We find that at a resonance occurs at which the cyclic frequency ω tends to infinity. For values of cr which are close to the resonance point, the frequency shift may be both negative or positive and the imaginary part of the frequency attains the negative (positive) sign for ().
Key words: convection / Sun: oscillations / turbulence
© ESO, 2002
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