NDLI: Polarity reversals in dependence on the Prandtl number and density stratification

Content Provider	Springer Nature Link
Author	Šimkanin, Ján
Copyright Year	2014
Abstract	Dependence of polarity reversals on the Prandtl number and density stratification using the MAG dynamo code was investigated. The magnetic field is dipole-dominated in the stable polarity state and during the reversals it is multipolar. Quadrupole and octupole components of magnetic fields are stronger at the Prandtl number equal to 0.2 than at the Prandtl number equal to 1. Polarity reversals occur at higher values of the Rayleigh number, while at its lower values the magnetic field does not undergo reversals. The situation is the same with the magnetic Prandtl number: polarity reversals occur at higher values of the magnetic Prandtl number, while at its lower values the magnetic field does not undergo reversals (neither if the magnetic field becomes weak in the polar regions nor if it is strong). During the 1000 simulated time units two reversals occur in the case of uniform stratification and at both investigated values of the Prandtl number, while in the case of non-uniform stratification and at both investigated values of the Prandtl number only one reversal occurs.
Starting Page	137
Ending Page	158
Page Count	22
File Format	PDF
ISSN	00393169
Journal	Studia Geophysica et Geodaetica
Volume Number	59
Issue Number	1
e-ISSN	15731626
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-07-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	polarity reversals Prandtl number non-uniform density stratification hydromagnetic dynamo Geophysics/Geodesy Structural Geology Atmospheric Sciences
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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