Noise characteristics of full-disc helioseismic observations made by resonant scattering spectrometers

CHAPLIN, W. J., ELSWORTH, Y., ISAAK, G. R., MILLER, B. A., NEW, R. and PINTER, B. (2005). Noise characteristics of full-disc helioseismic observations made by resonant scattering spectrometers. Monthly notices of the Royal Astronomical Society, 359 (2), 607-614.

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Resonant scattering spectrometers (RSSs) have been used to make high-precision full-disc helioseismic observations since the 1970s. They are capable of very high-precision determinations of line-shift, meaning that they are used to obtain precise velocity measurements, and, for suitably configured RSSs, the disc-averaged longitudinal magnetic field (SMMF). In order to exploit fully the very extensive high-precision data sets, it is essential to understand the noise characteristics of the instruments. This paper re-examines the consequences for velocity and SMMF determinations of there being noise on the scattered light signals measured by an RSS. It presents a theoretical description, and analysis of simulations, which match well the noise variations found recently in both BiSON velocity and SMMF observations. It also outlines a method for using the differences between the power spectra of redundant channels to analyse instrumental noise characteristics.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Nanotechnology Centre for PVD Research
Identification Number:
Page Range: 607-614
Depositing User: Ann Betterton
Date Deposited: 08 Jun 2010 10:10
Last Modified: 18 Mar 2021 09:45

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