Helioseismology, theory; Oscillations, solar; Turbulence; Waves, acoustic; Astronomy and Astrophysics; Space and Planetary Science
Abstract :
[en] Solar gravity modes are considered the Rosetta Stone for probing and subsequently deciphering the physical properties of the solar inner-most layers. Recent claims of positive detection therefore shed some new light on the long-standing issue of estimating solar gravity mode amplitudes. In this article, our objective is to review the theoretical efforts intended to predict solar gravity-mode amplitudes. Because most of these studies assume analogous driving and damping properties to those of the observed acoustic modes, we also provide a short overview of our current knowledge for these modes in the Sun and solar-type stars (which show solar-like oscillations) before diving into the specific problem of solar gravity modes. Finally, taking recent estimates into account, we conclude and confirm that the low-frequency domain (typically between 10μHz and 100μHz) is certainly best suited to focus on for detecting solar gravity modes. More precisely, around 60μHz (approximately four-hour period), the theoretical estimates are only slightly lower than the observational detection threshold as provided by the GOLF (Global Oscillations at Low Frequencies) instrument by about a factor of two. This is typically within the current uncertainties associated with theoretical estimates and should motivate us to improve our knowledge on turbulence in the whole solar convective region, which is key to improving the accuracy of g-mode amplitude estimates. The recent detection of solar inertial modes (Gizon et al., Astron. Astrophys.652, L6, 2021) combined with the continuous development of numerical simulations provide interesting prospects for future studies.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Belkacem, K. ; LESIA, Observatoire de Paris, CNRS, Université PSL, Sorbonne Université, Université Paris Cité, Meudon, France
Pinçon, C. ; LERMA, Observatoire de Paris, PSL University, CNRS, Sorbonne University, Paris, France
Buldgen, Gaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie ; Astronomy Department, University of Geneva, Versoix, Switzerland
Sorbonne University FNS - Fonds National Suisse de la Recherche scientifique
Funding text :
AS was primary investigator and performed this examination. HA, ME, AF, YN, NM, MY, and HS. planned and performed this study. KM performed the statistical analysis. YF designed this study and he is a head of the department supervisor. All the authors read and approved the final manuscript. We are grateful to the members of the Japan Medical Association of Ukiha, the elected officials and residents of Tanushimaru, and the team of cooperating physicians for their help in performing the health examinations. This study was supported in part by the Kimura Memorial Heart Foundation (Fukuoka, Japan). SNF AMBIZIONE
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