  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.
