Cross-spectral analysis of solar oscillation time series

Details Cross-spectral analysis of solar oscillation time series Cross-spectral analysis of solar oscillation time series

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jphcs.118a2091s&link_type=abstract

Journal of Physics: Conference Series, Volume 118, Issue 1, pp. 012091 (2008).

Physics

Scientific paper

Spatial leakage is an unavoidable artifact in the extraction of solar oscillation modes by spheric harmonic decomposition from the wavefield observed on the solar surface. The determination of solar frequencies by spectral analysis is therefore greatly affected by spatial leakage. Here we show in which way spatial leakage also influences the cross-spectra between different solar oscillation modes. Simulations show that spatial leakage induces significant coherences between oscillations of degree I and I + 2 with low azimuthal order m.

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