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Astron. Astrophys. 346, L61-L64 (1999)

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Letter to the Editor

Improving the signal-to-noise ratio in solar oscillation spectra

R.A. García 1,2, S.M. Jefferies 2, C.G. Toner 2 and P.L. Pallé 3

1 Service d'Astrophysique, CEA/DSM/DAPNIA, CE Saclay, F-91191 Gif sur Yvette, France
2 National Solar Observatory, P.O. Box 26732, Tucson, AZ 85726, USA
3 Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain

Received 30 April 1999 / Accepted 14 May 1999


We describe a data analysis technique for helioseismology that provides a reduction in the contamination of the solar oscillation spectrum from incoherent noise. We show that the technique allows: (i) a significant improvement in the signal-to-noise ratio for the modes in the oscillation power spectrum, and (ii) the solar velocity background spectrum to be observed at low frequencies using ground-based observations.

Key words: Sun: oscillations – methods: data analysis

Send offprint requests to: rgarcia@cea.fr

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© European Southern Observatory (ESO) 1999

Online publication: June 17, 1999