Acceleration of Plasma Flows Due to Reverse Dynamo Mechanism
نویسندگان
چکیده
The ”reverse–dynamo” mechanism — the amplification/generation of fast plasma flows by micro scale (turbulent) magnetic fields via magneto–fluid coupling is recognized and explored. It is shown that macroscopic magnetic fields and flows are generated simultaneously and proportionately from microscopic fields and flows. The stronger the micro–scale driver, the stronger are the macro–scale products. Stellar and astrophysical applications are suggested. Subject headings: acceleration of particles — magnetic fields — MHD — instabilities — Stars: magnetic fields — Stars: atmospheres — Stars: chromospheres — Stars: coronae — ISM: magnetic fields Electronic mail: [email protected] Electronic mail: [email protected] [email protected]
منابع مشابه
Acceleration of Plasma Flows Due to Inverse Dynamo Mechanism
The ”inverse–dynamo” mechanism — the amplification/generation of fast plasma flows by short scale (turbulent) magnetic fields via magneto–fluid coupling is recognized and explored. It is shown that large–scale magnetic fields and flows are generated simultaneously and proportionately from short scale fields and flows. The stronger the short–scale driver, the stronger are the large–scale product...
متن کاملM ay 2 00 9 Cosmic dynamo analogue and decay of magnetic fields in 3 D Ricci flows May 13 , 2009
Magnetic curvature effects, investigated by Barrow and Tsagas (BT) [Phys Rev D 77,(2008)],as a mechanism for magnetic field decay in open Friedmann universes (Λ < 0), are applied to dynamo geometric Ricci flows in 3D curved substrate in laboratory. By simple derivation, a covariant three-dimensional magnetic self-induced equation, presence of these curvature effects, indicates that de Sitter co...
متن کاملSlow dynamo modes in compact Riemannian plasma devices from Brazilian spherical tokamak data
Anti-dynamo modes are usually found in spheromaks plasma devices experiments due to the fact that Cowlings anti-dynamo theorem is naturally applied to axisymmetric devices and flows. In this paper full consideration is given to the existence of slow dynamo modes in the case of compact Riemannian plasma devices without boundaries, such as tokamaks, stellarators and torsatrons. It is shown that a...
متن کاملThe Self - Similar Turbulent Dynamo
We consider the problem of magnetic-energy amplification by a turbulent flow of conducting fluid. This effect is known as the small-scale turbulent dynamo, and it is believed to be relevant in application to magnetic fields in astrophysical objects. It is, in fact, a generic property of random (in time and/or space) flows that they can amplify magnetic fluctuations at scales smaller than the sc...
متن کاملRiemann curvature-stretching coupling in dynamo torus laboratory and in UHF twisted plasma loops
Kleeorin, Rogachevskii, Tomin and Sokoloff [Phys Rev E79,046302,(2009)] have shown that Roberts slow dynamo can be transformed into a fast dynamo by allowing its coefficients randomly fluctuate. Stretching, fundamental for fast dynamo action, is increased by mean helicity flow. Previous investigation on slow dynamo plasma and anti-fast dynamo theorem in Riemannian geometry [Garcia de Andrade, P...
متن کامل