Searching for solar g-modes, tests of a statistical method.
Abstract
The solar g-modes are extremely difficult to detect because of their very small amplitude and because of the absence of any regular pattern in their frequency distribution. A frequency dependent noise power spectrum and a g-mode power spectrum can look extremely similar. The authors propose to use crosscorrelation and autocorrelation methods to test the presence of g-modes in a real power spectrum. This method is used on 3 years of ACRIM irradiance data with negative conclusion. It is also tested with synthetic g-modes computed into a standard and a non standard model. Only the standard model seems to offer enough regularity in rotational splitting and in period separation to make reliable the measurement of these two parameters.
- Publication:
-
Seismology of the Sun and Sun-Like Stars
- Pub Date:
- December 1988
- Bibcode:
- 1988ESASP.286..393F
- Keywords:
-
- Autocorrelation;
- Cross Correlation;
- Solar Gravitation;
- Solar Oscillations;
- Power Spectra;
- Solar Physics;
- Solar Spectra;
- Stellar Models;
- Solar Physics;
- Solar Oscillations: Computer Simulations;
- Solar Oscillations: Methods of Observation