Detection and temporal coherence of p-modes below 1.4 mHz

Details Detection and temporal coherence of p-modes below 1.4 mHz Detection and temporal coherence of p-modes below 1.4 mHz

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008an....329..470e&link_type=abstract

Astronomische Nachrichten, Vol.329, Issue 5, p.470

Statistics

Methodology

Methods: Data Analysis, Sun: Helioseismology, Sun: Interior

Scientific paper

Data collected recently by the helioseismic experiments aboard the SOHO spacecraft have allowed the detection of low degree p-modes with increasingly lower order n. In particular, the GOLF experiment is currently able to unambiguously identify low degree modes with frequencies as low as 1.3 mHz. The detection of p-modes with very low frequency ({i.e.}, low n), is difficult due to the low signal-to-noise ratio in this spectral region and its contamination by solar signals that are not of acoustic origin. To address this problem without using any theoretical a priory, we propose a methodology that relies only on the inversion of observed values to define a spectral window for the expected locations of these low frequency modes. The application of this method to 2920-day-long GOLF observations is presented and its results discussed.

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