192 citations · 846 across the 36 of their papers we have counts for
37 papers
Asymptotic behaviour of galactic small-scale dynamos at modest magnetic Prandtl number
Frederick A. Gent, Mordecai-Mark Mac Low, Maarit J. Korpi-Lagg +2
Magnetic fields are critical at many scales to galactic dynamics and structure, including multiphase pressure balance, dust processing, and star formation. Dynamo action determines…
Mathematical Aspects of Geophysical and Astrophysical Fluid Dynamics: Magnetic buoyancy instability in galaxies
Yasin Qazi, Anvar Shukurov, Devika Tharakkal +1
We study the nonlinear evolution of the magnetic buoyancy instability in rotating and non-rotating gas layers using numerical solutions of non-ideal, isothermal MHD equations. The…
On the relation between magnetic field strength and gas density in the interstellar medium: A multiscale analysis
D. J. Whitworth, S. Srinivasan, R. E. Pudritz +19
The magnetic field strength to gas density relation in the interstellar medium is of fundamental importance. We present and compare Bayesian analyses of the B-n relation for two co…
Almost fifty years of Metsähovi solar observations on 37 GHz with recovered digitised historical maps
Sami Kivistö, Frederick Gent, Merja Tornikoski +2
Context. Aalto University Metsähovi Radio Observatory has collected solar intensity maps for over 45 years. Most data coverage is on the 37 GHz frequency band, tracking emissions p…
Supernova dust destruction in the magnetized turbulent ISM
Florian Kirchschlager, Lars Mattsson, Frederick A. Gent
Dust in the interstellar medium (ISM) is critical to the absorption and intensity of emission profiles used widely in astronomical observations, and necessary for star and planet f…
Computational approaches to modeling dynamos in galaxies
Maarit J. Korpi-Lagg, Mordecai-Mark Mac Low, Frederick A. Gent
Galaxies are observed to host magnetic fields with a typical total strength of around 15microgauss. A coherent large-scale field constitutes up to a few microgauss of the total, wh…
Nonlinear magnetic buoyancy instability and turbulent dynamo
Yasin Qazi, Anvar Shukurov, Devika Tharakkal +2
Stratified disks with strong horizontal magnetic fields are susceptible to magnetic buoyancy instability (MBI). Modifying the magnetic field and gas distributions, this can play an…
Numerical evidence for a small-scale dynamo approaching solar magnetic Prandtl numbers
Jörn Warnecke, Maarit J. Korpi-Lagg, Frederick A. Gent +1
Magnetic fields on small scales are ubiquitous in the universe. Though they can often be observed in detail, their generation mechanisms are not fully understood. One possibility i…
Transition from small-scale to large-scale dynamo in a supernova-driven, multiphase medium
Frederick A. Gent, Mordecai-Mark Mac Low, Maarit J. Korpi-Lagg
Magnetic fields are widely recognised as critical at many scales to galactic dynamics and structure, including multiphase pressure balance, dust processing, and star formation. Usi…
Steady states of the Parker instability: the effects of rotation
Devika Tharakkal, Anvar Shukurov, Frederick A. Gent +2
We model the Parker instability in vertically stratified isothermal gas using non-ideal MHD three-dimensional simulations. Rotation, especially differential, more strongly and dive…
Steady states of the Parker instability
Devika Tharakkal, Anvar Shukurov, Frederick A. Gent +3
We study the linear properties, nonlinear saturation and a steady, strongly nonlinear state of the Parker instability in galaxies. We consider magnetic buoyancy and its consequence…
The small-scale dynamo in a multiphase supernova-driven medium
Frederick A. Gent, Mordecai-Mark Mac Low, Maarit J. Korpi-Lagg +1
Magnetic fields grow quickly, even at early cosmological times, suggesting the action of a small-scale dynamo (SSD) in the interstellar medium (ISM) of galaxies. Many studies have…
Supernova induced processing of interstellar dust: impact of ISM gas density and gas turbulence
Florian Kirchschlager, Lars Mattsson, Frederick A. Gent
Quantifying the efficiency of dust destruction in the interstellar medium (ISM) due to supernovae (SNe) is crucial for the understanding of galactic dust evolution. We present 3D h…
Investigating global convective dynamos with mean-field models: full spectrum of turbulent effects required
Jörn Warnecke, Matthias Rheinhardt, Mariangela Viviani +3
The role of turbulent effects for dynamos in the Sun and stars continues to be debated. Mean-field (MF) theory provides a broadly used framework to connect these effects to fundame…
Small-Scale Dynamo in Supernova-Driven Interstellar Turbulence
Frederick A. Gent, Mordecai-Mark Mac Low, Maarit J. Kapyla +1
Magnetic fields grow quickly even at early cosmological times, suggesting the action of a small-scale dynamo (SSD) in the interstellar medium of galaxies. Many studies have focused…
The Pencil Code, a modular MPI code for partial differential equations and particles: multipurpose and multiuser-maintained
A. Brandenburg, A. Johansen, P. A. Bourdin +34
The Pencil Code is a highly modular physics-oriented simulation code that can be adapted to a wide range of applications. It is primarily designed to solve partial differential equ…
MHD supernova explosions -- Large-scale magnetic field effects
Cetin Can Evirgen, Frederick Gent
We examine the effect of uniform ambient magnetic fields on the evolution of supernova-driven blast waves into a homogeneous ambient ISM in thermal equilibrium. Using the Pencil Co…
Modelling 3D magnetic networks in a realistic solar atmosphere
Frederick A. Gent, Ben Snow, Viktor Fedun +1
The magnetic network extending from the photosphere (solar radius ) to lower corona ( Mm) plays an important role in the heating mechanisms of the sol…
The supernova-regulated ISM -- VI. Magnetic effects on the structure of the interstellar medium
C. C. Evirgen, F. A. Gent, A. Shukurov +2
We explore the effect of magnetic fields on the vertical distribution and multiphase structure of the supernova-driven interstellar medium (ISM) in simulations that admit dynamo ac…
Clustering and dynamic decoupling of dust grains in turbulent molecular clouds
Lars Mattsson, Akshay Bhatnagar, Fred A. Gent +1
We present high resolution () simulations of super-/hyper-sonic isothermal hydrodynamic turbulence inside an interstellar molecular cloud (resolving scales of typically 20…
Magnetic field effects on the ISM structure and galactic outflows
A. Shukurov, C. C. Evirgen, A. Fletcher +2
The role of magnetic fields in the multi-phase interstellar medium (ISM) is explored using magnetohydrodynamic (MHD) simulations that include energy injection by supernova (SN) exp…
Mean fields and fluctuations in compressible magnetohydrodynamic flows
J. F. Hollins, G. R. Sarson, C. C. Evirgen +3
We apply Gaussian smoothing to obtain mean magnetic field, density, velocity, and magnetic and kinetic energy densities from our numerical model of the interstellar medium, based o…
Sensitivity to luminosity, centrifugal force, and boundary conditions in spherical shell convection
Petri J. Käpylä, Frederick A. Gent, Nigul Olspert +2
We test the sensitivity of hydrodynamic and magnetohydrodynamic turbulent convection simulations with respect to Mach number, thermal and magnetic boundary conditions, and the cent…
Modelling supernova driven turbulence
Frederick A. Gent, Mordecai-Mark Mac Low, Maarit J. Käpylä +2
High Mach number shocks are ubiquitous in interstellar turbulence. The Pencil Code is particularly well suited to the study of magnetohydrodynamics in weakly compressible turbulenc…