The internal structure of the Sun inferred from g modes and low-frequency p modes

Abstract

The Phoebus group is an international collaboration of helioseismologists, its aim being to detect low-frequency solar g modes. Here, we report on recent work, including the development and application of new techniques based on the detection of coincidences in contemporaneous datasets and the asymptotic properties of the g-mode frequencies. The length of the time series available to the community is now more than ten years, and this has reduced significantly the upper detection limits on the gmode amplitudes. Furthermore, low-degree p modes can now be detected clearly at frequencies below 1000 μHz.