VORTICITY GENERATION IN LOCALIZED MAGNETIC FIELDS S.Cuevas

نویسنده

  • S. Smolentsev
چکیده

The generation of vorticity in localized magnetic fields is explored under the low magnetic Reynolds number approximation. Analytic solutions for a creeping flow past a magnetic point dipole are obtained through a perturbation method. Also, numerical calculations for the flow past a finite size magnetic dipole are presented. It is shown that vortical structures may become unstable when inertial effects are not negligible.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Vorticity generation in creeping flow past a magnetic obstacle.

The generation of vorticity in the two-dimensional creeping flow of an incompressible, electrically conducting viscous fluid past a localized magnetic field distribution is analyzed under the low magnetic Reynolds number approximation. It is shown that the Lorentz force produced by the interaction of the induced electric currents with the nonuniform magnetic field acts as an obstacle for the fl...

متن کامل

New mechanism of generation of large-scale magnetic fields in merging protogalactic and protostellar clouds

A new mechanism of generation of large-scale magnetic fields in colliding protogalactic clouds and merging protostellar clouds is discussed. Interaction of the colliding clouds produces large-scale shear motions which are superimposed on small-scale turbulence. Generation of the large-scale magnetic field is due to a ”shear-current” effect (or ”vorticity-current” effect), and the mean vorticity...

متن کامل

Cosmological magnetic fields from nonlinear effects

In the standard cosmological model, magnetic fields and vorticity are generated during the radiation era via second-order density perturbations. In order to clarify the complicated physics of this second-order magnetogenesis, we use a covariant approach and present the electromagnetodynamical equations in the fully nonlinear regime. We use the tight-coupling approximation to analyze Thomson and...

متن کامل

A Vorticity-magnetic Field Dynamo Instability

We generalize the mean field magnetic dynamo to include local evolution of the mean vorticity in addition to the mean magnetic field. The coupled equations exhibit a general mean field dynamo instability that enables the transfer of turbulent energy to the magnetic field and vorticity on larger scales. The growth of the vorticity and magnetic field both require helical turbulence which can be s...

متن کامل

ar X iv : a st ro - p h / 03 05 59 5 v 1 3 0 M ay 2 00 3 Generation of large scale magnetic fields at recombination epoch

It is argued that large scale cosmic magnetic field could be generated in the primeval plasma slightly before hydrogen recombination. Non-zero vorticity, necessary for that, might be created by the photon diffusion in the second order in the temperature fluctuations. The resulting seed fields at galactic scale would be only 4 orders of magnitude smaller than the observed ones and with a mild ga...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2006