Computer Science – Sound
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp21c02u&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP21C-02 INVITED
Computer Science
Sound
7522 Helioseismology
Scientific paper
The Search for Solar g Modes Most deductions about the solar interior structure and dynamics come from the analysis of the frequencies of solar p modes. For these modes, the restoring force is the change in pressure and the derived information relates directly to the sound speed and the density. For the gravity or g modes, the restoring force is the bouyancy of the displaced gas which opposes the perturbing motion in a stable gas. The quantity which determines the frequencies of oscillation is proportional to the difference between the actual temperature lapse rate and the adiabatic lapse rate. This quantity is sensitive to the derivative of the temperature instead of the temperature itself as is the case with the p modes. Consequently, essentially new information will be provided if g modes can be identified. The hindering factor in making this identification is the low amplitude of these modes compared to the random signals coming from convective and other incoherent solar processes. The following steps are being taken to isolate the coherent modes from the incoherent signals: 1) Cross-Correlation Analysis between GOLF and MDI to reduce the incoherent components. 2) Identification of low frequency p modes to improve the structure of the reference solar model and its prediction of solar g-mode frequencies. 3) Singular Spectral Analysis in the form of a Random Lag Singular Cross Spectral Analysis to reduce the amplitude of interfering incoherent components. 4) Analysis of the joint significance of peaks in a multiplet as required from the spherical harmonic degree l. 5) Search for groups of power spectrum peaks at low frequency which are consistent with asymptotic formulae. The significance (or lack thereof) for potential identifications will be discussed.
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