A new model to reproduce the I-V phase difference and the coherence spectra of the p-mode solar oscillation
Abstract
We develop a simple model based on a dumped harmonic oscillator excited by a random forcing, with the aim to reproduce the observed trends in the intensity (I) and velocity (V) phase difference and coherence spectra. The model accounts for an oscillation mode embedded in a solar background which is partly correlated to the mode. The complex vectors I and V and the corresponding I-V phase difference and coherence spectra are computed. We also computed the I and V power spectra. For comparison we used the GONG data at l = 17 and the average of the data at n = 2 from l = 160 to l = 200 computed by Oliviero et al. (2001), these proceedings. The obtained results are interesting to understand how the convective solar background affects the spectra and in what fraction it is correlated to the modes.
- Publication:
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SOHO 10/GONG 2000 Workshop: Helio- and Asteroseismology at the Dawn of the Millennium
- Pub Date:
- January 2001
- Bibcode:
- 2001ESASP.464..653M
- Keywords:
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- SOLAR OSCILLATION;
- SOLAR BACKGROUND SPECTRA