Simulations of solar and stellar dynamos and their theoretical interpretation

PJ Käpylä, MK Browning, AS Brun, G Guerrero… - Space Science …, 2023 - Springer
We review the state of the art of three dimensional numerical simulations of solar and stellar
dynamos. We summarize fundamental constraints of numerical modelling and the …

Recent advances on solar global magnetism and variability

AS Brun, MK Browning, M Dikpati, H Hotta… - Space Science …, 2015 - Springer
We discuss recent observational, theoretical and numerical progress made in understanding
the solar global magnetism and its short and long term variability. We discuss the physical …

Grand minima and equatorward propagation in a cycling stellar convective dynamo

K Augustson, AS Brun, M Miesch… - The Astrophysical …, 2015 - iopscience.iop.org
ABSTRACT The 3D MHD Anelastic Spherical Harmonic code, using slope-limited diffusion,
is employed to capture convective and dynamo processes achieved in a global-scale stellar …

Solar magnetic field reversals and the role of dynamo families

ML DeRosa, AS Brun, JT Hoeksema - The Astrophysical Journal, 2012 - iopscience.iop.org
The variable magnetic field of the solar photosphere exhibits periodic reversals as a result of
dynamo activity occurring within the solar interior. We decompose the surface field as …

Effects of full-sphere convection on M-dwarf dynamo action, flux emergence, and spin-down

CP Bice, J Toomre - The Astrophysical Journal, 2023 - iopscience.iop.org
We present an analysis of 21 global MHD simulations of the dynamo action taking place in
the interiors of fully convective M4 stars. We leverage our past work involving 45 simulations …

Numerical simulations of the Tayler–Spruit dynamo in proto-magnetars

P Barrère, J Guilet, R Raynaud… - Monthly Notices of the …, 2023 - academic.oup.com
ABSTRACT The Tayler–Spruit dynamo is one of the most promising mechanisms proposed
to explain angular momentum transport during stellar evolution. Its development in proto …

Mercury's anomalous magnetic field caused by a symmetry-breaking self-regulating dynamo

F Takahashi, H Shimizu, H Tsunakawa - Nature communications, 2019 - nature.com
The discovery of Mercury's unusually axisymmetric, anomalously axially offset dipolar
magnetic field reveals a new regime of planetary magnetic fields. The cause of the offset …

Supermodulation of the Sun's magnetic activity: the effects of symmetry changes

NO Weiss, SM Tobias - Monthly Notices of the Royal …, 2016 - academic.oup.com
In this paper, we argue that the solar activity record, as revealed by telescopic observations
and proxy data from the abundances of cosmogenic isotopes, is consistent with the action of …

Magnetochronology of solar-type star dynamos

Q Noraz, AS Brun, A Strugarek - Astronomy & Astrophysics, 2024 - aanda.org
Aims. In this study, we analyse the magnetic field properties of a set of 15 global
magnetohydrodynamic (MHD) simulations of solar-type star dynamos conducted using the …

Reversals of a large-scale field generated over a turbulent background

B Gallet, J Herault, C Laroche, F Pétrélis… - … & Astrophysical Fluid …, 2012 - Taylor & Francis
We present a study of several systems in which a large-scale field is generated over a
turbulent background. These large-scale fields break a symmetry of the forcing by selecting …