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

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

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mnras.359..607c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 359, Issue 2, pp. 607-614.

Astronomy and Astrophysics

Astronomy

7

Techniques: Spectroscopic, Sun: Helioseismology

Scientific paper

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.

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