Gauss separation algorithm: Difference between revisions
Brianwelsch (talk | contribs) Denoted article as a stub, chose electromagnetism as closest stub topic among existing physics stubs, added geomagnetism category |
Brianwelsch (talk | contribs) Minor, added link to poloidal-toroidal decomposition wiki page, as this technique is needed when radial currents cross the surface of interest. |
||
| Line 1: | Line 1: | ||
[[Carl Friedrich Gauss]], in his treatise ''Allgemeine Theorie des Erdmagnetismus'',<ref>{{harvnb|Glassmeier|2014}}</ref> presented a method, '''the Gauss separation algorithm''', of partitioning the [[magnetic field]] [[Vector (mathematics and physics)|vector]], '''B'''<math>(r, \theta, \phi)</math>, measured over the surface of a sphere into two components, internal and external, arising from electric currents (per the [[Biot–Savart law]]) flowing in the volumes interior and exterior to the spherical surface, respectively. The method employs [[spherical harmonics]]. When radial currents flow through the surface of interest, the decomposition is more complex, and |
[[Carl Friedrich Gauss]], in his treatise ''Allgemeine Theorie des Erdmagnetismus'',<ref>{{harvnb|Glassmeier|2014}}</ref> presented a method, '''the Gauss separation algorithm''', of partitioning the [[magnetic field]] [[Vector (mathematics and physics)|vector]], '''B'''<math>(r, \theta, \phi)</math>, measured over the surface of a sphere into two components, internal and external, arising from electric currents (per the [[Biot–Savart law]]) flowing in the volumes interior and exterior to the spherical surface, respectively. The method employs [[spherical harmonics]]. When radial currents flow through the surface of interest, the decomposition is more complex, involving the decomposition of the field into [[Poloidal–toroidal decomposition|poloidal and toroidal]] components. In this case, an additional term (the toroidal component) accounts for the contribution of the radial current to the magnetic field on the surface.<ref>{{harvnb|Olsen|2010}}</ref> |
||
The method is commonly used in studies of terrestrial and planetary magnetism, to relate measurements of magnetic fields either at the planetary surface or in orbit above the planet to currents flowing in the planet's interior (internal currents) and its magnetosphere and ionosphere (external currents). |
The method is commonly used in studies of terrestrial and planetary magnetism, to relate measurements of magnetic fields either at the planetary surface or in orbit above the planet to currents flowing in the planet's interior (internal currents) and its magnetosphere and ionosphere (external currents). |
||
Revision as of 16:48, 21 July 2022
Carl Friedrich Gauss, in his treatise Allgemeine Theorie des Erdmagnetismus,[1] presented a method, the Gauss separation algorithm, of partitioning the magnetic field vector, B, measured over the surface of a sphere into two components, internal and external, arising from electric currents (per the Biot–Savart law) flowing in the volumes interior and exterior to the spherical surface, respectively. The method employs spherical harmonics. When radial currents flow through the surface of interest, the decomposition is more complex, involving the decomposition of the field into poloidal and toroidal components. In this case, an additional term (the toroidal component) accounts for the contribution of the radial current to the magnetic field on the surface.[2]
The method is commonly used in studies of terrestrial and planetary magnetism, to relate measurements of magnetic fields either at the planetary surface or in orbit above the planet to currents flowing in the planet's interior (internal currents) and its magnetosphere and ionosphere (external currents).
Notes
References
- Glassmeier, K.-H.; Tsurutani, Bruce T. (2014), "Carl Friedrich Gauss – General Theory of Terrestrial Magnetism – a revised translation of the German text", Hist. Geo Space Sci, 5: 11–62, Bibcode:2014HGSS....5...11G, doi:10.5194/hgss-5-11-2014
{{citation}}: CS1 maint: unflagged free DOI (link). - Olsen, N.; Glassmeier, K.-H.; Jia, X. (2010), "Separation of the Magnetic Field into External and Internal Parts", Space Science Reviews, 152 (1–4): 135–157, Bibcode:2010SSRv..152..135O, doi:10.1007/s11214-009-9563-0.
 | This electromagnetism-related article is a stub. You can help Wikipedia by expanding it. |