Spatial scales and locality of magnetic helicity
نویسندگان
چکیده
منابع مشابه
synthesis of amido alkylnaphthols using nano-magnetic particles and surfactants
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15 صفحه اولMagnetic helicity and cosmological magnetic field
The magnetic helicity has paramount significance in nonlinear saturation of galactic dynamo. We argue that the magnetic helicity conservation is violated at the lepton stage in the evolution of early Universe. As a result, a cosmological magnetic field which can be a seed for the galactic dynamo obtains from the beginning a substantial magnetic helicity which has to be taken into account in the...
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It is shown that the turbulent dynamo -e ect converts magnetic helicity from the turbulent eld to the mean eld when the turbulence is electromagnetic while the magnetic helicity of the meaneld is transported across space when the turbulence is electrostatic or due to the electron diamagnetic e ect. In all cases, however, the dynamo e ect strictly conserves the total helicity except for a batter...
متن کاملMagnetic Helicity Evolution
The term “dynamo” means different things to the laboratory fusion plasma and astrophysical plasma communities. To alleviate the resulting confusion and to facilitate interdisciplinary progress, we pinpoint conceptual differences and similarities between laboratory plasma dynamos and astrophysical dynamos. We can divide dynamos into three types: 1. magnetically dominated helical dynamos which su...
متن کاملCreation and evolution of magnetic helicity
Projecting a non-Abelian SU(2) vacuum gauge field – a pure gauge constructed from the group element U – onto a fixed (electromagnetic) direction in isospace gives rise to a nontrivial magnetic field, with nonvanishing magnetic helicity, which coincides with the winding number of U . Although the helicity is not conserved under Maxwell (vacuum) evolution, it retains one-half its initial value at...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2020
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201936675