Spatial Cross Spectrum: Reducing Incoherent Convective Background of Resolved Heloseismic Instruments

Details Spatial Cross Spectrum: Reducing Incoherent Convective Background of Resolved Heloseismic Instruments Spatial Cross Spectrum: Reducing Incoherent Convective Background of Resolved Heloseismic Instruments

2008-10-09

arxiv.org/abs/0810.1717v1

Astronomy and Astrophysics

Astrophysics

Proceedings of the GONG2008/SOHO21, 4 pages 2 figures

Scientific paper

Measurements of low-order p modes and gravity modes are perturbed by the solar convective background. Such perturbation increases below 2mHz for intensity measurements and 1mHz for velocity measurements. While the low-degree modes have large spatial scales, the convective motions have much smaller spatial distribution. In this work, we take advantage of these different scale sizes to explore the use of spatial cross spectrum between different regions of the Sun. The aim is to reduce the incoherent background noise and, therefore, increase the signal-to-noise ratio of the signals that are coherent across the full disk. To do so we use the VIRGO/LOI instrument aboard SoHO and the GONG ground-based network to study the intensity and velocity spatial cross spectra.

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