Galactic dynamo simulations
نویسندگان
چکیده
منابع مشابه
Galactic dynamo simulations
Recent simulations of supernova-driven turbulence within the ISM support the existence of a large-scale dynamo. With a growth time of about two hundred million years, the dynamo is quite fast – in contradiction to many assertions in the literature. We here present details on the scaling of the dynamo effect within the simulations and discuss global meanfield models based on the adopted turbulen...
متن کاملGalactic magnetic fields and spiral arms 3D dynamo simulations
We investigate the evolution of three-dimensional (3D), large-scale galactic magnetic fields under the influence of time dependent gas flows in spiral arms and excited by a turbulent dynamo. Our principal goal is to check how the enhanced turbulent diffusion in spiral arms affects the global magnetic field structure evolving under the influence of the dynamically changing gaseous spiral arms. S...
متن کاملDirect simulations of a supernova-driven galactic dynamo
Context. Supernovae are known to be the dominant energy source for driving turbulence in the interstellar medium. Yet their effect on magnetic field amplification in spiral galaxies is still poorly understood. Analytical models based on the evolution of isolated, non-interacting supernova remnants predicted a dominant vertical pumping rendering dynamo action improbable. Aims. In the present wor...
متن کاملA Magnetic αω Dynamo in Active Galactic Nuclei Disks: II. Magnetic Field Generation, Theories and Simulations
It is shown that a dynamo can operate in an Active Galactic Nuclei (AGN) accretion disk due to the Keplerian shear and due to the helical motions of expanding and twisting plumes of plasma heated by many star passages through the disk. Each plume rotates a fraction of the toroidal flux into poloidal flux, always in the same direction, through a finite angle, and proportional to its diameter. Th...
متن کاملDirect numerical simulations of the galactic dynamo in the kinematic growing phase
We present kinematic simulations of a galactic dynamo model based on the large scale differential rotation and the small scale helical fluctuations due to supernova explosions. We report for the first time direct numerical simulations of the full galactic dynamo using an unparameterized global approach. We argue that the scale of helicity injection is large enough to be directly resolved rather...
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: Proceedings of the International Astronomical Union
سال: 2008
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921309031135