A model of intensity and velocity power and I-V phase difference across p-mode line profile based on a forced damped harmonic oscillator and on the observed coherence spectrum
Abstract
We develop a simple model, based on a damped harmonic oscillator excited by a random forcing, with the aim to reproduce the observed trends in the intensity I and velocity V power and in the I-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 power spectra and I-V phase difference are computed. The observed power spectra and the I-V phase difference in the frequencies range 2.245 - 2.275 mHz for l = 17 (GONG data) are used as a comparison. We can also reproduce the trend of the observed coherence. The obtained results are quite stimulating to understand how the correlated convective background affects the data and what fraction of the convective background is correlated to the mode.
- Publication:
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Memorie della Societa Astronomica Italiana
- Pub Date:
- 2001
- Bibcode:
- 2001MmSAI..72..511M
- Keywords:
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- Solar Oscillations