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No swan song for Sun-as-a-star helioseismology: performances of the Solar-SONG prototype for individual mode characterisation by Breton, S. N.; Pallé, P. L.; García, R. A.; Andersen, M. Fredslund; Grundahl, F.; Christensen-Dalsgaard, J.; Kjeldsen, H.; Mathur, S. is a scholarly article available to read on EtoBox.

What is No swan song for Sun-as-a-star helioseismology: performances of the Solar-SONG prototype for individual mode characterisation about?

The GOLF instrument on board SoHO has been in operation for almost 25 years but aging of the instrument has now strongly affected its performance, especially in the low-frequency p-mode region. At the end of the SoHO mission, the ground-based network BiSON will remain the only facility able to perform Sun-integrated helioseismic observations. Therefore, we want to assess the helioseismic performances of an \'echelle spectrograph like SONG. Indeed, the high precision of such an instrument and the quality of the data acquired for asteroseismic purpose calls for an evaluation of the instrument ability to perform global radial-velocity measurements of the solar disk. Data acquired during the Solar-SONG 2018 observation campaign at the Teide Observatory are used to study mid- and low-frequency p modes. A Solar-SONG time series of 30-day duration is reduced with a combination of the traditional IDL iSONG pipeline and a new Python pipeline described in this paper. A mode fitting method built around a Bayesian approach is then performed on the Solar-SONG and contemporaneous GOLF, BiSON, and HMI data. For this contemporaneous time series, Solar-SONG is able to characterise p modes at a lowe

Author

Breton, S. N.; Pallé, P. L.; García, R. A.; Andersen, M. Fredslund; Grundahl, F.; Christensen-Dalsgaard, J.; Kjeldsen, H.; Mathur, S.

Published

2021

Language

EN