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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F12%3A10123628%21RIV13-GA0-11320___
rdf:type
n14:Vysledek skos:Concept
rdfs:seeAlso
http://dx.doi.org/10.1111/j.1365-246X.2012.05407.x
dcterms:description
Observations of the ocean-induced magnetic field by the CHAMP magnetic space mission have the potential to be used as a constraint when examining ocean dynamics. This has initiated theoretical studies on the prediction of the poloidal magnetic field induced by the horizontal ocean-circulation flow. This study deals with the computation and analysis of the toroidal magnetic field induced by the tidal ocean-circulation flow on the background of the main Earths geomagnetic field. Since the induced toroidal magnetic field cannot be modelled by the single-layer approximation model used to predict the poloidal magnetic field, we treat the ocean as a spherical layer of a finite thickness and compute the toroidal magnetic field by a matrix-propagator technique with a source of electric currents in the ocean layer. Our numerical simulations based on the OMCT tidal ocean velocities show that the induced toroidal magnetic field is extremely sensitive to the vertical gradient of horizontal ocean flow. The larger this gradient, the stronger the induced toroidal magnetic field. Specifically, its magnitudes vary from 10(-2) nT for barotropic flow to several nT for baroclinic flow. We show that the induced toroidal magnetic field generated by M-2 tidal forcing is comparable in amplitude to the induced poloidal part of the field. The induced toroidal and poloidal magnetic fields differ, however, in their spatial behaviour. Observations of the ocean-induced magnetic field by the CHAMP magnetic space mission have the potential to be used as a constraint when examining ocean dynamics. This has initiated theoretical studies on the prediction of the poloidal magnetic field induced by the horizontal ocean-circulation flow. This study deals with the computation and analysis of the toroidal magnetic field induced by the tidal ocean-circulation flow on the background of the main Earths geomagnetic field. Since the induced toroidal magnetic field cannot be modelled by the single-layer approximation model used to predict the poloidal magnetic field, we treat the ocean as a spherical layer of a finite thickness and compute the toroidal magnetic field by a matrix-propagator technique with a source of electric currents in the ocean layer. Our numerical simulations based on the OMCT tidal ocean velocities show that the induced toroidal magnetic field is extremely sensitive to the vertical gradient of horizontal ocean flow. The larger this gradient, the stronger the induced toroidal magnetic field. Specifically, its magnitudes vary from 10(-2) nT for barotropic flow to several nT for baroclinic flow. We show that the induced toroidal magnetic field generated by M-2 tidal forcing is comparable in amplitude to the induced poloidal part of the field. The induced toroidal and poloidal magnetic fields differ, however, in their spatial behaviour.
dcterms:title
The modelling of the toroidal magnetic field induced by tidal ocean circulation The modelling of the toroidal magnetic field induced by tidal ocean circulation
skos:prefLabel
The modelling of the toroidal magnetic field induced by tidal ocean circulation The modelling of the toroidal magnetic field induced by tidal ocean circulation
skos:notation
RIV/00216208:11320/12:10123628!RIV13-GA0-11320___
n14:predkladatel
n17:orjk%3A11320
n3:aktivita
n6:P
n3:aktivity
P(GAP210/10/2227)
n3:cisloPeriodika
2
n3:dodaniDat
n5:2013
n3:domaciTvurceVysledku
n8:5731550
n3:druhVysledku
n7:J
n3:duvernostUdaju
n18:S
n3:entitaPredkladatele
n16:predkladatel
n3:idSjednocenehoVysledku
151139
n3:idVysledku
RIV/00216208:11320/12:10123628
n3:jazykVysledku
n12:eng
n3:klicovaSlova
Marine electromagnetics; Magnetic field; Geomagnetic induction; Electromagnetic theory; Tides and planetary waves; Numerical solutions; EARTH; SIGNALS; VISCOSITY; SEA; FLOW; MANTLE; ELECTROMAGNETIC INDUCTION
n3:klicoveSlovo
n4:Tides%20and%20planetary%20waves n4:ELECTROMAGNETIC%20INDUCTION n4:FLOW n4:Geomagnetic%20induction n4:EARTH n4:MANTLE n4:Numerical%20solutions n4:VISCOSITY n4:Electromagnetic%20theory n4:SIGNALS n4:SEA n4:Marine%20electromagnetics n4:Magnetic%20field
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[54BAC30926B4]
n3:nazevZdroje
GEOPHYSICAL JOURNAL INTERNATIONAL
n3:obor
n20:DE
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
3
n3:projekt
n13:GAP210%2F10%2F2227
n3:rokUplatneniVysledku
n5:2012
n3:svazekPeriodika
189
n3:tvurceVysledku
Martinec, Zdeněk Thomas, Maik Dostal, Jan
n3:wos
000302623600006
s:issn
0956-540X
s:numberOfPages
17
n21:doi
10.1111/j.1365-246X.2012.05407.x
n19:organizacniJednotka
11320