Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Magnetic_helicity> ?p ?o. }
Showing items 1 to 21 of
21
with 100 items per page.
- Magnetic_helicity abstract "In plasma physics, magnetic helicity is the extent to which a magnetic field "wraps around itself". It is a generalization of the topological concept of linking number to the differential quantities required to describe the magnetic field. As with many quantities in electromagnetism, magnetic helicity (which describes magnetic field lines) is closely related to fluid mechanical helicity (which describes fluid flow lines).If magnetic field lines follow the strands of a twisted rope, this configuration would have nonzero magnetic helicity; left-handed ropes would have negative values and right-handed ropes would have positive values.Formally,where is the magnetic field strength is the vector potential of Magnetic helicity has units of Wb2 (webers squared). It is a conserved quantity in electromagnetic fields, even when magnetic reconnection dissipates energy. The concept is useful in solar dynamics and in hydromagnetic dynamo theory. Magnetic helicity is a gauge-dependent quantity, because can be redefined by adding a gradient to it (gauge transformation). However, for perfectly conducting boundaries or periodic systems without a net magnetic flux, the magnetic helicity is gauge invariant. A gauge-invariant relative helicity has been defined for volumes with non-zero magnetic flux on their boundary surfaces If the magnetic field is turbulent and weakly inhomogeneous a magnetic helicity density and its associated flux can be defined in terms of the density of field line linkages.".
- Magnetic_helicity wikiPageExternalLink publications.
- Magnetic_helicity wikiPageExternalLink webhelicity.html.
- Magnetic_helicity wikiPageID "1082916".
- Magnetic_helicity wikiPageRevisionID "605288126".
- Magnetic_helicity hasPhotoCollection Magnetic_helicity.
- Magnetic_helicity subject Category:Physical_quantities.
- Magnetic_helicity subject Category:Plasma_physics.
- Magnetic_helicity type Abstraction100002137.
- Magnetic_helicity type Measure100033615.
- Magnetic_helicity type PhysicalQuantities.
- Magnetic_helicity comment "In plasma physics, magnetic helicity is the extent to which a magnetic field "wraps around itself". It is a generalization of the topological concept of linking number to the differential quantities required to describe the magnetic field.".
- Magnetic_helicity label "Magnetic helicity".
- Magnetic_helicity label "磁気ヘリシティ".
- Magnetic_helicity sameAs 磁気ヘリシティ.
- Magnetic_helicity sameAs m.044hvv.
- Magnetic_helicity sameAs Q11587832.
- Magnetic_helicity sameAs Q11587832.
- Magnetic_helicity sameAs Magnetic_helicity.
- Magnetic_helicity wasDerivedFrom Magnetic_helicity?oldid=605288126.
- Magnetic_helicity isPrimaryTopicOf Magnetic_helicity.