Global Oscillations Network Group
GONG
The Global Oscillation Network Group, or GONG Network is a worldwide network of six identical telescopes, designed to have 24/7 observations of the Sun. The network serves multiple purposes, including the provision of operation data for use in space weather prediction, and the study of solar internal structure and dynamics using helioseismology. Operations started in 1996. The rest of nodes are installed in Chile, California, Hawai, Australia and India.