Results 1 to 10 of about 3,477 (194)

Inferring the Magnetic Field from the Rayleigh–Taylor Instability

The Astrophysical Journal, 2023
By extending the potential approach of Layzer and Goncharov to the magnetohydrodynamics equations, we find the nonlinear solutions to the single-mode Rayleigh–Taylor instability subjected to uniform magnetic fields at various inclinations. This allows us
Benoît-Joseph Gréa, Antoine Briard
doaj   +1 more source

Magnetohydrodynamic Simulations of the Supernova Remnant G1.9+0.3

The Astrophysical Journal, 2023
The youngest Galactic supernova remnant G1.9+0.3 shows a discrete feature between its radio and X-ray morphologies. The observed radio morphology features a single maximum in the north, while the X-ray observation shows two opposite “ears” on the east ...
Shaobo Zhang, Wenwu Tian, Mengfei Zhang, Hui Zhu, Xiaohong Cui   +4 more
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Global MHD Simulations of the Time-dependent Corona

The Astrophysical Journal, 2023
We describe, test, and apply a technique to incorporate full-Sun, surface flux evolution into an MHD model of the global solar corona. Requiring only maps of the evolving surface flux, our method is similar to that of Lionello et al., but we introduce ...
Roberto Lionello, Cooper Downs, Emily I. Mason, Jon A. Linker, Ronald M. Caplan, Pete Riley, Viacheslav S. Titov, Marc L. DeRosa   +7 more
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Rotation in Event Horizon Telescope Movies

The Astrophysical Journal, 2023
The Event Horizon Telescope (EHT) has produced images of M87* and Sagittarius A*, and will soon produce time sequences of images, or movies. In anticipation of this, we describe a technique to measure the rotation rate, or pattern speed Ω _p , from ...
Nicholas S. Conroy, Michi Bauböck, Vedant Dhruv, Daeyoung Lee, Avery E. Broderick, Chi-kwan Chan, Boris Georgiev, Abhishek V. Joshi, Ben Prather, Charles F. Gammie   +9 more
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The Athena++ Adaptive Mesh Refinement Framework: Multigrid Solvers for Self-gravity

The Astrophysical Journal Supplement Series, 2023
We describe the implementation of multigrid solvers in the Athena++ adaptive mesh refinement (AMR) framework and their application to the solution of the Poisson equation for self-gravity.
Kengo Tomida, James M. Stone
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Influence of Crustal Magnetic Fields on Horizontal Plasma Transport and Ion Escape on Mars

The Astrophysical Journal, 2023
Owing to its unevenly distributed crustal fields, Mars acts as a unique obstacle to the solar wind. In the presence of the crustal fields, the transport of the planetary ions on the dayside ionosphere exhibits north–south asymmetry.
Guokan Li, Haoyu Lu, Yun Li, Jinbin Cao, Xiaoxin Zhang, Shibang Li   +5 more
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Gravitational waves from supernova matter [PDF]

, 2010
We have performed a set of 11 three-dimensional magnetohydrodynamical core collapse supernova simulations in order to investigate the dependencies of the gravitational wave signal on the progenitor's initial conditions.
Abbott B, Dessart L, Eriguchi Y, Heger A, Kaeppeli R Whitehouse S C Scheidegger S Pen U Liebendoerfer M, Kotake K, Kotake K, Kotake K, Kotake K, Landau L D, Liebendörfer M, Liebendörfer M, Liebendörfer M, Liebendörfer M, Liebendörfer M, M Liebendörfer, Mezzacappa A, Misner C W, Mueller E, Murphy J W, Müller E, Ott C D, Ott C D, Ott C D, Ott C D, Ou S, R Käppeli, S C Whitehouse, S Scheidegger, Saijo M, Scheidegger S Kaeppeli R Whitehouse S C Fischer T Liebendoerfer M, Shoemaker D, Tassoul J-L, Thorne K S, Watts A L, Zwerger T   +35 more
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Implementation of Chemistry in the Athena++ Code

The Astrophysical Journal Supplement Series, 2023
Chemistry plays a key role in many aspects of astrophysical fluids. Atoms and molecules are agents for heating and cooling, determine the ionization fraction, serve as observational tracers, and build the molecular foundation of life.
Munan Gong, Ka Wai Ho, James M. Stone, Eve C. Ostriker, Paola Caselli, Tommaso Grassi, Chang-Goo Kim, Jeong-Gyu Kim, Goni Halevi   +8 more
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A Magnetohydrodynamic Model for the Formation of Episodic Jets [PDF]

, 2009
Episodic ejection of plasma blobs have been observed in many black hole systems. While steady, continuous jets are believed to be associated with large-scale open magnetic fields, what causes the episodic ejection of blobs remains unclear.
Balbus, Blandford, Blandford, Blandford, Corbel, De Villiers, De Villiers, Eckart, Fender, Fender, Fender, Feng Yuan, Forbes, Goodman, Hirose, Hjellming, Jun Lin, Kinwah Wu, Lin, Lin, Lin, Livio, Luis C. Ho, Machida, Machida, Marscher, Mikić, Mikić, Mirabel, Mirabel, Narayan, Narayan, Narayan, Pringle, Romanova, Shakura, Shibata, Uzdensky, Uzdensky, van der Laan, Yuan, Yusef-Zadeh, Zhang   +42 more
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Unstable magnetohydrodynamical continuous spectrum of accretion disks. A new route to magnetohydrodynamical turbulence in accretion disks [PDF]

, 2007
We present a detailed study of localised magnetohydrodynamical (MHD) instabilities occuring in two--dimensional magnetized accretion disks. We model axisymmetric MHD disk tori, and solve the equations governing a two--dimensional magnetized accretion ...
Armitage, Balbus, Beliën, Blokland, Chandrasekhar, Frieman, Goedbloed, Goedbloed, Goedbloed, Goedbloed, Hameiri, Hawley, Hawley, Hellsten, Igumenshchev, J. P. Goedbloed, J. W. S. Blokland, Keppens, Pao, Poedts, Poedts, R. Keppens, Rappaz, Shakura, Sleijpen, Spruit, van der Holst, van der Swaluw, Velikhov, Zehrfeld   +29 more
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