@article{003ce64d616541c59ca45384bede2a53,
title = "Solar cycle variation of νmax in helioseismic data and its implications for asteroseismology",
abstract = "The frequency, νmax, at which the envelope of pulsation power peaks for solar-like oscillators is an important quantity in asteroseismology. We measure νmax for the Sun using 25 yr of Sun-as-a-star Doppler velocity observations with the Birmingham Solar-Oscillations Network (BiSON), by fitting a simple model to binned power spectra of the data. We also apply the fit to Sun-as-a-star Doppler velocity data from Global Oscillation Network Group and Global Oscillations at Low Frequency, and photometry data from VIRGO/SPM on the ESA/NASA SOHO spacecraft. We discover a weak but nevertheless significant positive correlation of the solar νmax with solar activity. The uncovered shift between low and high activity, of $\simeq 25\, \rm \mu Hz$, translates to an uncertainty of 0.8 per cent in radius and 2.4 per cent in mass, based on direct use of asteroseismic scaling relations calibrated to the Sun. The mean νmax in the different data sets is also clearly offset in frequency. Our results flag the need for caution when using νmax in asteroseismology.",
keywords = "Sun: activity, Sun: helioseismology, asteroseismology",
author = "Rachel Howe and Chaplin, {William J.} and Sarbani Basu and Ball, {Warrick H.} and Davies, {Guy R.} and Yvonne Elsworth and Hale, {Steven J.} and Andrea Miglio and Nielsen, {Martin Bo} and Viani, {Lucas S.}",
note = "Funding Information: We would like to thank all those who are, or have been, associated with BiSON, in particular, P. Pall{\'e} and T. Roca-Cort{\'e}s in Tenerife and E. Rhodes Jr. and S. Pinkerton at Mt. Wilson. BiSON is funded by the Science and Technology Facilities Council (STFC). This work utilizes data obtained by the GONG program, managed by the National Solar Observatory, which is operated by AURA, Inc. under a cooperative agreement with the National Science Foundation. The GOLF and VIRGO instruments on board SOHO are a cooperative effort of many individuals to whom we are indebted. SOHO is a project of international collaboration between ESA and NASA. Funding for the Stellar Astrophysics Centre is provided by the Danish National Research Foundation (grant agreement no. DNRF106). This work made use of the PYTHON packages SCIPY (Jones et al. 2001), NUMPY (Oliphant 2006), and ASTROPY,3 a community-developed core PYTHON package for Astronomy (Astropy Collaboration 2013; Price-Whelan et al. 2018). Publisher Copyright: {\textcopyright} 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.",
year = "2020",
month = jan,
day = "28",
doi = "10.1093/mnrasl/slaa006",
language = "English (US)",
volume = "493",
pages = "L49--L53",
journal = "Monthly Notices of the Royal Astronomical Society: Letters",
issn = "1745-3925",
publisher = "Oxford University Press",
number = "1",
}