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Networks for Helioseismic Observations

Published online by Cambridge University Press:  12 April 2016

Frank Hill
Frank Hill*
Affiliation:
National Solar Observatory, National Optical Astronomy Observatories, *Tucson, Arizona 85726USA

Abstract

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Helioseismology from a single ground-based observatory is severely compromised by the diurnal rising and setting of the Sun. This causes sidelobes to appear in the helioseismic power spectrum at multiples of ± 11.57 μHz from each solar line, contaminating the spectrum and rendering mode identification and frequency measurement extremely difficult. The difficulty can be overcome in three ways — observing from a fully sunlit orbit in space, observing from the Polar regions, or observing with a network of stations placed around the Earth. This paper discusses the networks that are either currently in operation or being planned. These include the Global Oscillation Network Group (GONG) project, the Birmingham network, the IRIS network of the University of Nice, and the SCLERA network of the University of Arizona. The scientific objectives and instrumentation of these networks are briefly described. Theoretical predictions for network performance are compared with actual results. The problem of merging simultaneous data from multiple instruments is discussed, as well as the relationship of the networks with the helioseismology experiments on the SOHO space mission.

Type
Part 3: Helioseismology
Information
International Astronomical Union Colloquium , Volume 121: Inside the Sun , 1990 , pp. 265 - 278
Copyright
Copyright © Kluwer 1990

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