Výsledky vyhledávání - "interior [Sun]"

Towards solar measurements of nuclear reaction rates

Autor: Jorgen Christensen-Dalsgaard, Earl Bellinger

Publikováno v: Bellinger, E P & Christensen-Dalsgaard, J 2022, ' Towards solar measurements of nuclear reaction rates ', Monthly Notices of the Royal Astronomical Society, vol. 517, no. 4, pp. 5281-5288 . https://doi.org/10.1093/mnras/stac1845

Nuclear reaction rates are a fundamental yet uncertain ingredient in stellar evolution models. The astrophysical S-factor pertaining to the initial reaction in the proton-proton chain is uncertain at the 1% level, which contributes a systematic but g

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::140799ebc4551cd5ffa932ac1898afa8
https://pure.au.dk/portal/da/publications/towards-solar-measurements-of-nuclear-reaction-rates(c5d4ab75-2851-44d4-8319-1ddb62bded49).html

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Searching for dark energy with the Sun

Autor: Saltas, Ippocratis D., Christensen-Dalsgaard, Jorgen

Publikováno v: Saltas, I D & Christensen-Dalsgaard, J 2022, ' Searching for dark energy with the Sun ', Astronomy and Astrophysics, vol. 667, A115 . https://doi.org/10.1051/0004-6361/202244176

General extensions of General Relativity (GR) based on bona fide degrees of freedom predict a fifth force which operates within massive objects, opening up an exciting opportunity to perform precision tests of gravity at stellar scales. Here, focusin

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Tidally Forced Planetary Waves in the Tachocline of Solar-like Stars

Autor: Gerrit M. Horstmann, George Mamatsashvili, André Giesecke, Teimuraz V. Zaqarashvili, Frank Stefani

Publikováno v: Astrophysical Journal 944(2023)48

Can atmospheric waves in planet-hosting solar-like stars substantially resonate to tidal forcing? Substantially at a level of impacting the space weather or even of being dynamo-relevant? In particular, low-frequency Rossby waves, which have been det

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Seismic solar models from Ledoux discriminant inversions

Autor: Jørgen Christensen-Dalsgaard, A. V. Oreshina, G. Buldgen, Sébastien Salmon, Alfred F. Noels, Richard Scuflaire, Patrick Eggenberger, Thierry Corbard, V. A. Baturin

Publikováno v: Buldgen, G, Eggenberger, P, Baturin, V A, Corbard, T, Christensen-Dalsgaard, J, Salmon, S J A J, Noels, A, Oreshina, A V & Scuflaire, R 2020, ' Seismic solar models from Ledoux discriminant inversions ', Astronomy and Astrophysics, vol. 642, A36 . https://doi.org/10.1051/0004-6361/202037980
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2020, 642, pp.A36. ⟨10.1051/0004-6361/202037980⟩
Astronomy and Astrophysics-A&A, 2020, 642, pp.A36. ⟨10.1051/0004-6361/202037980⟩
Astronomy & Astrophysics

The Sun constitutes an excellent laboratory of fundamental physics. With the advent of helioseismology, we were able to probe its internal layers with unprecedented precision. However, the current state of solar modelling is still stained by tedious

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::045b0cc9012fef4ccf1c9f7940b7b87c
https://pure.au.dk/portal/da/publications/seismic-solar-models-from-ledoux-discriminant-inversions(81c62168-040a-4c0d-89ad-7015985868c7).html

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On the dynamical interaction between overshooting convection and an underlying dipole magnetic field -- I. The non-dynamo regime

Autor: L. Korre, Pascale Garaud, Nicholas H. Brummell, Céline Guervilly

Publikováno v: Monthly Notices of the Royal Astronomical Society, vol 503, iss 1
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol 503, iss 1

Motivated by the dynamics in the deep interiors of many stars, we study the interaction between overshooting convection and the large-scale poloidal fields residing in radiative zones. We have run a suite of 3D Boussinesq numerical calculations in a

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Convective overshooting and penetration in a Boussinesq spherical shell

Autor: Nicholas H. Brummell, Pascale Garaud, L. Korre

Publikováno v: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol 484, iss 1
Monthly Notices of the Royal Astronomical Society, vol 484, iss 1
Korre, Lydia; Garaud, Pascale; & Brummell, Nicholas. (2019). Convective overshooting and penetration in a Boussinesq spherical shell. Monthly Notices of the Royal Astronomical Society, 484(1), 1220-1237. doi: 10.1093/mnras/stz047. UC Santa Cruz: Retrieved from: http://www.escholarship.org/uc/item/9xd2x265

Author(s): Korre, L; Garaud, P; Brummell, NH | Abstract: We study the dynamics associated with the extension of turbulent convective motions from a convection zone (CZ) into a stable region (RZ) that lies below the latter. For that purpose, we have r

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https://escholarship.org/uc/item/9xd2x265

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Successful and Failed Flux Tube Emergence in the Solar Interior

Autor: Vasilis Archontis, P. Syntelis, A. W. Hood

We report on our three-dimensional (3D) magnetohydrodynamic (MHD) simulations of cylindrical weakly twisted flux tubes emerging from 18 Mm below the photosphere. We perform a parametric study, by varying the initial magnetic field strength ($B_0$), r

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http://arxiv.org/abs/1902.07969

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Dissertation/ Thesis

Studies of the radial gradient of rotation near the solar surface

Autor: Barekat, Atefeh

Externí odkaz: http://hdl.handle.net/11858/00-1735-0000-002E-E354-F

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A Self-consistent Model of the Solar Tachocline

Autor: Toby S. Wood, Nicholas H. Brummell

Publikováno v: Wood, TS; & Brummell, NH. (2018). A Self-consistent Model of the Solar Tachocline. ASTROPHYSICAL JOURNAL, 853(2), 97-97. doi: 10.3847/1538-4357/aaa6d5. UC Santa Cruz: Retrieved from: http://www.escholarship.org/uc/item/4c467276
The Astrophysical Journal, vol 853, iss 2
ASTROPHYSICAL JOURNAL, vol 853, iss 2

We present a local but fully nonlinear model of the solar tachocline, using three-dimensional direct numerical simulations. The tachocline forms naturally as a statistically steady balance between Coriolis, pressure, buoyancy and Lorentz forces benea

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ff0b458be76f3cd5afd7b7f975c6eda7
http://www.escholarship.org/uc/item/4c467276

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On the hydrostatic stratification of the solar tachocline

Autor: Douglas Gough, Jørgen Christensen-Dalsgaard, Emil Knudstrup

Publikováno v: Christensen-Dalsgaard, J, Gough, D O & Knudstrup, E 2018, ' On the hydrostatic stratification of the solar tachocline ', Monthly Notices of the Royal Astronomical Society, vol. 477, no. 3, pp. 3845-3852 . https://doi.org/10.1093/mnras/sty752

We present an attempt to reconcile the solar tachocline glitch, a thin layer immediately beneath the convection zone in which the seismically inferred sound speed in the Sun exceeds corresponding values in standard solar models, with a degree of part

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