Article
Astronomy & Astrophysics
A. Adrover-Gonzalez, J. Terradas, R. Oliver, M. Carbonell
Summary: This study comprehensively investigates the gravitational stability of prominence threads using a basic hydrodynamic model, finding that stable and unstable equilibrium solutions are possible depending on various factors such as initial position, density contrast, length, and total length of magnetic field lines. The results of this study provide new insights into the behavior of threads in curved magnetic fields under the influence of gravity and can help interpret more complex numerical simulations.
ASTRONOMY & ASTROPHYSICS
(2021)
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)
Article
Mechanics
Long Chen, Alban Potherat, Ming-Jiu Ni, Rene Moreau
Summary: High-resolution direct numerical simulations were conducted to study turbulent shear flow of liquid metal in a cylindrical container driven by an azimuthal Lorentz force. The simulations accurately reproduced experimental findings and revealed a transition to small scale turbulence at certain Reynolds numbers. The study also confirmed theoretical laws for cutoff scale and characteristics of sheared magnetohydrodynamics (MHD) turbulence.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Astronomy & Astrophysics
R. N. Henriksen
Summary: The study shows that the characteristic X-shaped magnetic field polarization in edge-on spiral galaxies can develop magnetohydromagnetically from an initial disk magnetic field combined with wind and rotation. The rotation measure develops a corresponding X distribution in sign.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
R. Skalidis, J. Sternberg, J. R. Beattie, V. Pavlidou, K. Tassis
Summary: The method of estimating magnetic field strength in interstellar clouds by measuring dust polarization has been tested through theoretical arguments and numerical simulations. The results show that the ST method reflects better the physical reality in clouds with compressible and magnetized turbulence, providing a much better estimate of the magnetic field strength compared to the DCF method.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Athena Stacy, Christopher F. McKee, Aaron T. Lee, Richard Klein, Pak Shing Li
Summary: This study simulates the effects of magnetic fields on the formation of Population III stars and finds that magnetic fields suppress the formation of low-mass Pop III stars, affecting the initial mass function of the Population III galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
I Moya-Torregrosa, A. Fuentes, J. M. Marti, J. L. Gomez, M. Perucho
Summary: This paper investigates the transversal structure and properties of recollimation shocks of axisymmetric, relativistic, superfast magnetosonic, overpressured jets, discussing the relevance of magnetic tension and Lorentz force in shaping the internal structure of the jets. Highly magnetized non-force-free jets exhibit a thin spine of high internal energy around the axis. The properties of the recollimation shocks and sideways expansions and compressions of the jet are influenced by factors such as magnetic tension and magnetosonic Mach number.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
A. Fuentes, I Torregrosa, J. M. Marti, J. L. Gomez, M. Perucho
Summary: This paper deepens our understanding of the properties of recollimation shocks of relativistic, superfast magnetosonic jets through modeling and analysis. The study finds that cross-section emission asymmetry in all models is caused by differential changes in the angle between the helical magnetic field and the line of sight across the jet width. Additionally, highly magnetized jets with large toroidal fields tend to have weaker shocks and weaker radio knots, with signatures visible in the linearly polarized synchrotron emission.
ASTRONOMY & ASTROPHYSICS
(2021)
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
Shyeh Tjing Loi
Summary: The complex interplay of rotation and magnetism in evolved stars requires proper modeling of both factors to draw robust conclusions about the existence of a core magnetic field in any given object.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
James Wurster, Matthew R. Bate, Daniel J. Price, Ian A. Bonnell
Summary: This study investigates the origin of the kG-strength magnetic fields observed in young stars through high-resolution numerical simulations. The results suggest that these magnetic fields are most likely generated by a dynamo process and are implanted in low-mass stars during their formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. Terradas, T. Neukirch
Summary: In this study, we calculated three-dimensional equilibrium models of active region structures that take into account finite plasma-beta and gravity effects. By gradually deforming the initial potential magnetic field, we successfully incorporated the effect of shear and generated a variety of magnetohydrostatic models. The thermal structure of the active regions was achieved through the dependence of gas pressure and temperature on the Euler potentials. Additionally, we investigated the basic topologies that include neutral lines and analyzed the stability of the calculated 3D models.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
J. Terradas, R. Soler, R. Oliver, P. Antolin, I. Arregui, M. Luna, I. Piantschitsch, E. Soubrie, J. L. Ballester
Summary: This article proposes several two-dimensional magnetohydrostatic equilibrium solutions to represent the magnetic structures of coronal holes and active regions. By simulating and calculating, a thermal structure similar to observations is obtained, and the influences of force balance and energy balance are studied. The results of this study are of great significance for our understanding of these structures in the solar atmosphere.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
M. Sieyra, S. Krishna Prasad, G. Stenborg, E. Khomenko, T. Van Doorsselaere, A. Costa, A. Esquivel, J. M. Riedl
Summary: The aim of this study is to understand the effect of projection on observed speeds by comparing them with those from a numerical model. The analysis of multi-wavelength data reveals a dominant period of 2-3 minutes for intensity disturbances at different heights of the atmosphere. Both observed propagation speeds and those calculated from the synthetic model exhibit an accelerated pattern.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
M. J. Stift, F. Leone
Summary: This study examines the observational modelling of horizontal abundance distributions and magnetic geometries in chemically peculiar stars using Zeeman Doppler mapping, highlighting the importance of using correct formulas for magnetic fields in observational constraints.
ASTRONOMY & ASTROPHYSICS
(2022)