The local analysis to investigate the source of the solar oscillations
Abstract
The phase difference between the intensity and velocity (I-V) is claimed to be a powerful tool in the understanding the nature of the solar oscillations. The identification of a solar "background" in the I-V l-ν diagrams has been associated to a possible signature of the source of the resonant oscillations. Many attempts have been accomplished to match the results from the models to the recent I-V trait obtained from the obervations. In this paper we present the I-V from a different point of view: the local analysis. We expect that this approach can reveal the local, non-resonant, phenomena, in addition to the global behavior enhanced by the spherical harmonic decomposition. Nevertheless, when convection is negligible, still two populations of phase values are significant, likewise in the l-ν diagram. The advantage of this method consists of the capability to follow the distribution on the disk of the I-V phase at different frequencies and correlate to the solar structures. The results address, in the five-minute band, the "background" locations to those points where the velocity power is low. The analysis is new and the results put some constraints to the characteristics of the source of the five-minute oscillations.
- Publication:
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Memorie della Societa Astronomica Italiana
- Pub Date:
- 2001
- Bibcode:
- 2001MmSAI..72..522M
- Keywords:
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- Solar Oscillations