Abstract
The Global Oscillation Network Group ( GONG) is an international, community-based project to conduct a detailed study of solar internal structure and dynamics using helioseismology. In order to exploit this technique, GONG has developed a network of six extremely sensitive and stable solar velocity imagers to obtain nearly continuous observations of the Sun's “five-minute” oscillations. GONG also provides magnetograms nominally every twenty minutes. The system became operational in October 1995, and will operate for an eleven-year solar cycle. The observation duty cycle has averaged about 90%, and single-site data loss due to instrument down time is less than 2%. Data is processed at pace with the collection rate. Progress is underway to replace the original 256 × 242 rectangular pixel cameras, with 1024 × 1024 square pixels cameras to obtain the optimal scientific return from the instruments from the eleven-year run. There are 175 individual members of the GONG, from 70 different institutions, and 20 nations.
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