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The GONG (Global Oscillation Network Group) network consists of 6 automated
observing stations around the world. The original 256x256 pixel instruments
observed from 1995 to 2001, providing quasi-continuous, medium-degree
helioseismic data with a duty cycle around 85%.
The network was then upgraded to the 'GONG+' 1024x1024 pixel cameras,
which allow us to detect modes up to around l=1000. The upgrade
means that we can now apply the techniques of local helioseismology to
monitor flows close to the surface, as well as continuing global
helioseismology with the medium-l p modes that probe rotation and structure
well into the solar interior.
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