Monte Carlo filtering for the detection of phase-coherent solar signal in the low-frequency domain

Details Monte Carlo filtering for the detection of phase-coherent solar signal in the low-frequency domain Monte Carlo filtering for the detection of phase-coherent solar signal in the low-frequency domain

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.517..287g&link_type=abstract

In: Proceedings of SOHO 12 / GONG+ 2002. Local and global helioseismology: the present and future, 27 October - 1 November 2002,

Computer Science

Helioseismology

Scientific paper

The detection of the global solar modes is mostly made thanks to the associated local maximum in the power spectrum of the signal. This analysis has not been very successful below 1.3 mHz, due probably to the random signals generated by the surface perturbations emerging from the convective zone. We propose an heuristic description of an alternate analysis using a mean phase evaluation over a set of cross-correlation of 2 randomly generated complementary functions, themselves extracted from the helioseismic signal. This analysis is used to explore the frequency range below 1.5 mHz, where we expect the gravity modes together with the low-order acoustic modes. The first preliminary results obtained between 100 μHz and 300 μHz for GOLF (Gabriel et al. 1995) are briefly shown.

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