The Global Oscillation Network Group (GONG) project is a community-based program to conduct a detailed study of solar internal structure and dynamics using helioseismology, by means of observations from a network of six stations spread around the World. It is funded by the National Science Foundation through the National Solar Observatory, a division of the National Optical Astronomy Observatories. NOAO is operated under a cooperative agreement between the Association of Universities for Research in Astronomy and NSF.
More information on the GONG project and other network projects are provided here. See also the home page of the project.