Abstract
Observations of solar oscillations by the Global Oscillation Network Group (GONG) using a network of telescopes deployed around the Earth eliminate tempo- ral aliases from the oscillation power spectra to a very substantial extent, making the measurement of oscillation mode parameters much cleaner than with single-site ob- servations. However, the problem of spatial aliasing, which arises from the fact that we see only one side of the Sun, still causes some problems. We discuss some of the issues aecting the estimation of medium-l solar acoustic mode parameters from the data obtained by the GONG net- work, and in particular the contamination by spatial leak- age. We determine the areas in thel plane in which such leakage is a problem, and nally we describe a method for improving the mode frequency estimation in such regions, thus extending the range of modes for which useful fre- quency estimates can be obtained.
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