Review
Chemistry, Multidisciplinary
Songzhu Luo, Kamal Elouarzaki, Zhichuan J. Xu
Summary: Developing new strategies in magnetoelectrochemistry is crucial to control and understand electrochemical reactions. It combines concepts from multiple disciplines and explores the effects of magnetic fields on fundamental electrochemical principles.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Astronomy & Astrophysics
Andreea Henriksen, Victoria Antoci, Hideyuki Saio, Matteo Cantiello, Hans Kjeldsen, Donald W. Kurtz, Simon J. Murphy, Savita Mathur, Rafael A. Garcia, Angela R. G. Santos
Summary: The Kepler mission discovered various types of stellar variability, including magnetic activity and oscillations. In this study, the researchers analyzed the periodic signal in 162 intermediate-mass stars, known as Rossby modes and rotational modulation. They investigated whether the rotational modulation was caused by magnetic spots or by Overstable Convective modes. The results suggest that the magnetic spots scenario is more likely to explain the observed feature, but further investigation and observations are needed to confirm this.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Xing Wei
Summary: In rapidly rotating turbulence, the standard mixing length theory breaks down, but the Coriolis force affects the force balance, resulting in a dependence of the magnetic field on rotation. By simplifying the dynamo equations and utilizing the theory of isotropic nonrotating or anisotropic rotating turbulence driven by thermal convection, we derived scaling laws for stellar magnetic fields that are in good agreement with observations.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
B. Gouhier, L. Jouve, F. Lignieres
Summary: This study aims to investigate the interaction between flows and magnetic fields in a contracting radiative zone, and their influence on the rotational history of stars. Numerical simulations show that large-scale magnetic fields can alter the flow structure and potentially lead to instability. These findings provide a new explanation for the angular momentum transport problem during rapid stellar evolution.
ASTRONOMY & ASTROPHYSICS
(2022)
Review
Multidisciplinary Sciences
Ting Li, Eric Priest, Ruilong Guo
Summary: Magnetic reconnection is a fundamental process in various plasmas, with distinct characteristics in two dimensions compared to three dimensions. The focus here is on three-dimensional reconnection in the plasma environment of the Solar System, particularly solar flares. A new paradigm for solar flares, where three-dimensional reconnection plays a central role, is proposed.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Astronomy & Astrophysics
Suoqing Ji, Jim Fuller, Daniel Lecoanet
Summary: The Tayler instability is a poorly studied magnetohydrodynamic instability that is likely to occur in stellar interiors. The non-linear saturation of the instability is not well understood, but it has crucial consequences for dynamo action and angular momentum transport in radiative regions of stars.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Maria C. Schutte, Leslie Hebb, Simon Lowry, John Wisniewski, Suzanne L. Hawley, Suvrath Mahadevan, Brett M. Morris, Paul Robertson, Graeme Rohn, Gudmundur Stefansson
Summary: Understanding the magnetic activity of stars other than the Sun is crucial for studying exoplanets' atmospheres and stellar activity. By modeling the surface features of various spectral types and rotation rates, we can gain insights into the magnetic activity of these stars.
ASTRONOMICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Andrei P. Igoshev, Konstantinos N. Gourgouliatos, Rainer Hollerbach, Toby S. Wood
Summary: Researchers have found through numerical simulations that tangled magnetic field configurations in neutron stars can explain the thermal emission properties of some CCOs, including complex surface thermal patterns and periodic modulations in hot spots in the light curve.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Oscar M. Pimentel Diaz, P. Chris Fragile, F. D. Lora-Clavijo, Bridget Ierace, Deepika Bollimpalli
Summary: The study investigates the impact of magnetic susceptibility on magneto-rotational instability (MRI) within the context of black hole accretion, finding that paramagnetic discs exhibit shorter wavelength and faster growth rate for unstable modes compared to diamagnetic discs. Additionally, the magnetization parameter in the saturated state is predicted to be smaller in paramagnetic discs. Numerical simulations confirm these predictions, showing higher vertically integrated stress and mass accretion rate in paramagnetic discs compared to diamagnetic discs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Mathematics
Andrey Saveliev
Summary: In this work, the authors revisit Boltzmann's distribution function and show that magnetic fields can be included as an intrinsic constituent of the distribution function by theoretically deriving its complex-valued version in its most general form. They validate these considerations by deriving the equations of ideal magnetohydrodynamics, demonstrating the suitability of their method for describing the dynamics of charged particles in magnetic fields.
Article
Astronomy & Astrophysics
G. Mattia, L. Del Zanna, M. Bugli, A. Pavan, R. Ciolfi, G. Bodo, A. Mignone
Summary: This paper provides the first systematic numerical study of the propagation of astrophysical relativistic jets using high-resolution, shock-capturing RRMHD simulations. The study investigates the impact of different values and models for the plasma resistivity coefficient on turbulence, current sheet formation, reconnection plasmoids, electromagnetic energy content, and dissipated power.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
D. Millas, N. Achilleos, P. Guio, C. S. Arridge
Summary: The magnetic fields of Jupiter and Saturn deviate from a pure magnetic dipole, causing the centrifugal confinement of cold plasma near the equator and the formation of a disc-like structure called a magnetodisc. This study presents an updated numerical implementation of Caudal's iterative scheme to model the magnetosphere, incorporating newer equatorial density, temperature, and hot plasma profiles obtained from Galileo data. Additionally, an algorithm is described and used to update the angular velocity profile based on information from the magnetodisc, and comparisons between the model predictions and spacecraft observations are presented.
PLANETARY AND SPACE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Ludovic Petitdemange, Florence Marcotte, Christophe Gissinger
Summary: The evolution of stars is influenced by internal rotation dynamics, but the mechanisms involved are not well understood. Magnetic fields may play a role in transporting angular momentum and chemical elements, but the origin of magnetism in radiative stellar layers is unclear. Through numerical simulations, we identified a subcritical transition from laminar flow to turbulence caused by a magnetic dynamo. This mechanism could produce strong magnetic fields inside radiative stars that are not observable on their surface.
Article
Astronomy & Astrophysics
H. Dhouib, S. Mathis, L. Bugnet, T. Van Reeth, C. Aerts
Summary: The study finds that strong toroidal magnetic fields have an impact on the period spacings of gravity and Rossby modes. An equatorial azimuthal magnetic field with an amplitude of about 10^5 G can be detected in high radial-order modes in gamma Dor and SPB stars. However, more complex hemispheric configurations are more difficult to observe.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Mingrui Liu, Yue Hu, A. Lazarian, Siyao Xu, Marian Soida
Summary: Magnetic fields are important in galaxy formation and evolution, but are challenging to measure. This study uses synchrotron polarization and the Velocity Gradient Technique (VGT) to measure the magnetic field orientations in the Seyfert galaxy NGC 3627. The results show that the magnetic field orientations measured by VGT are globally consistent with the polarization, suggesting that the magnetic fields associated with synchrotron emission also permeate star-forming regions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
