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The Global Oscillation Network Group (GONG) Project

1996; American Association for the Advancement of Science; Volume: 272; Issue: 5266 Linguagem: Inglês

10.1126/science.272.5266.1284

1095-9203

J. W. Harvey, F. Hill, Rob Hubbard, J. R. Kennedy, J. W. Leibacher, J. A. Pintar, Peter A. Gilman, R. W. Noyes, A. M. Title, Juri Toomre, R. K. Ulrich, A. Bhatnagar, J. Kennewell, W. Marquette, J. Patrón, O. Saá, E. Yasukawa,

Stellar, planetary, and galactic studies

Helioseismology requires nearly continuous observations of the oscillations of the solar surface for long periods of time in order to obtain precise measurements of the sun's normal modes of oscillation. The GONG project acquires velocity images from a network of six identical instruments distributed around the world. The GONG network began full operation in October 1995. It has achieved a duty cycle of 89 percent and reduced the magnitude of spectral artifacts by a factor of 280 in power, compared with single-site observations. The instrumental noise is less than the observed solar background.