Searching for g modes: Part I. A new calibration of the GOLF instrument

Abstract

The recent claims of g-mode detection have restarted the search for these potentially extremely important modes. These claims can be reassessed in view of the different data sets available from the SoHO instruments and ground-based instruments. We produce a new calibration of the GOLF data with a more consistent p-mode amplitude and a more consistent time shift correction compared to the time series used in the past. The calibration of 22 years of GOLF data is done with a simpler approach that uses only the predictive radial velocity of the SoHO spacecraft as a reference. Using p modes, we measure and correct the time shift between ground- and space-based instruments and the GOLF instrument. The p-mode velocity calibration is now consistent to within a few percent with other instruments. The remaining time shifts are within $\pm$ 5 s for 99.8% of the time series. Accepted by A&A on June 29, 2018

8 pages, 8 figures

References in corpus (3)

• Asymptotic g modes: Evidence for a rapid rotation of the solar core
• Fragile detection of solar g modes by Fossat et al
• Validation of solar-cycle changes in low-degree helioseismic parameters from the Birmingham Solar-Oscillations Network

Cited by in corpus (12)

• Solar structure and evolution
• Magnetic signatures on mixed-mode frequencies. I. An axisymmetric fossil field inside the core of red giants
• Connecting photometric and spectroscopic granulation signals with CHEOPS and ESPRESSO
• Searching for g modes: Part II. Unconfirmed g-mode detection in the power spectrum of the time series of round-trip travel time
• Solar cycle variation of ${\nu }_{\max }$ in helioseismic data and its implications for asteroseismology
• 3D magneto-hydrodynamical simulations of stellar convective noise for improved exoplanet detection. I. Case of regularly sampled radial velocity observations
• A Critical Evaluation of Recent Claims Concerning Solar Rotation
• Seismic differences between solar magnetic cycles 23 and 24 for low-degree modes
• No swan song for Sun-as-a-star helioseismology: performances of the Solar-SONG prototype for individual mode characterisation
• A Multi-Instrument Investigation of the Frequency Stability of Oscillations Above the Acoustic Cut-Off Frequency with Solar Activity
• Semi-supervised standardized detection of extrasolar planets
• Global Helioseismology