The Global Oscillation Network Group site survey. 1: Data collection and analysis methods

Physics – Optics

Scientific paper

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Atmospheric Optics, Helioseismology, Principal Components Analysis, Solar Oscillations, Statistical Analysis, Statistical Correlation, Cloud Cover, Correlation Coefficients, Extinction, Irradiance, Least Squares Method, Magnetohydrodynamic Waves, Michelson Interferometers, Monte Carlo Method, Performance Prediction, Pyranometers, Signal To Noise Ratios, Solar Interior, Solar Rotation

Scientific paper

The Global Oscillation Network Group (GONG) Project is planning to place a set of instruments around the world to observe solar oscillations as continuously as possible for at least three years. The Project has now chosen the sites that will comprise the network. This paper describes the methods of data collection and analysis that were used to make this decision. Solar irradiance data were collected with a one-minute cadence at fifteen sites around the world and analyzed to produce statistics of cloud cover, atmospheric extinction, and transparency power spectra at the individual sites. Nearly 200 reasonable six-site networks were assembled from the individual stations, and a set of statistical measures of the performance of the networks was analyzed using a principal component analysis. An accompanying paper presents the results of the survey.

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