Magnetic field amplification by SN-driven interstellar turbulence
نویسندگان
چکیده
منابع مشابه
Magnetic Field Amplification by Sn-driven Interstellar Turbulence
Within the interstellar medium, supernovae are thought to be the prevailing agents in driving turbulence. Until recently, their effects on magnetic field amplification in disk galaxies remained uncertain. Analytical models based on the uncorrelated-ensemble approach predicted that any created field would be expelled from the disk before it could be amplified significantly. By means of direct si...
متن کاملNumerical Analysis of Magnetic Field Amplification by Turbulence
We apply a Fourier spectral numerical method to 3D incompressible MHD turbulence with a magnetic Prandtl number Pr ≥ 1. We examine the processes by which an initially weak, large-scale seed magnetic field and an initially weak, small-scale, impulse-like seed magnetic field are amplified. We find that in both cases the magnetic energy spectrum grows at all scales. The growth rates at different a...
متن کاملA galaxy dynamo by supernova-driven interstellar turbulence
Supernovae are the dominant energy source for driving turbulence within the interstellar plasma. Until recently, their effects on magnetic field amplification in disk galaxies remained a matter of speculation. By means of self-consistent simulations of supernova-driven turbulence, we find an exponential amplification of the mean magnetic field on timescales of a few hundred million years. The r...
متن کاملTurbulence and Magnetic Field Amplification in Supernova Remnants: Interactions between a Strong Shock Wave and Multi-phase Interstellar Medium
We examine MHD simulations of the propagation of a strong shock wave through the interstellar two-phase medium composed of small-scale cloudlets and diffuse warm neutral medium in two-dimensional geometry. The pre-shock two-phase medium is provided as a natural consequence of the thermal instability that is expected to be ubiquitous in the interstellar medium. We show that the shock-compressed ...
متن کاملMagnetic field generation by coherent turbulence structures
It is thought that the small-scale magnetic fields observed in accretion discs, galaxies and galactic clusters are generated by a dynamo process in which the turbulent plasma amplifies small initial magnetic fluctuations. Numerical simulations of turbulence have revealed that turbulence consists of filamentlike vortex structures superimposed on an incoherent background, which carry a considerab...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: EAS Publications Series
سال: 2010
ISSN: 1633-4760,1638-1963
DOI: 10.1051/eas/1044013