BISON data preparation: A correction for differential extinction and the weighted averaging of contemporaneous data

Guy Davies*, W. J. Chaplin, Y. Elsworth, Steven Hale

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)
164 Downloads (Pure)

Abstract

The Birmingham Solar Oscillations Network (BiSON) has provided high-quality high-cadence observations from as far back in time as 1978. These data must be calibrated from the raw observations into radial velocity and the quality of the calibration has a large impact on the signal-to-noise ratio of the final time series. The aim of this work is to maximize the potential science that can be performed with the BiSON data set by optimizing the calibration procedure. To achieve better levels of signal-to-noise ratio, we perform two key steps in the calibration process: we attempt a correction for terrestrial atmospheric differential extinction; and the resulting improvement in the calibration allows us to perform weighted averaging of contemporaneous data from different BiSON stations. The improvements listed produce significant improvement in the signal-to-noise ratio of the BiSON frequency-power spectrum across all frequency ranges. The reduction of noise in the power spectrum will allow future work to provide greater constraint on changes in the oscillation spectrum with solar activity. In addition, the analysis of the low-frequency region suggests that we have achieved a noise level that may allow us to improve estimates of the upper limit of g-mode amplitudes.

Original languageEnglish
Pages (from-to)3009-3017
Number of pages9
JournalRoyal Astronomical Society. Monthly Notices
Volume441
Issue number4
Early online date28 May 2014
DOIs
Publication statusE-pub ahead of print - 28 May 2014

Keywords

  • Data analysis-sun
  • Helioseismology-sun
  • Methods
  • Oscillations

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

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