Hydromagnetic dynamos at the low Ekman and magnetic Prandtl numbers

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F16%3A00472505" target="_blank" >RIV/67985530:_____/16:00472505 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1515/congeo-2016-0014" target="_blank" >http://dx.doi.org/10.1515/congeo-2016-0014</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1515/congeo-2016-0014" target="_blank" >10.1515/congeo-2016-0014</a>

Result language

angličtina

Original language name

Hydromagnetic dynamos at the low Ekman and magnetic Prandtl numbers

Original language description

Hydromagnetic dynamos are numerically investigated at low Prandtl, Ekman and magnetic Prandtl numbers using the PARODY dynamo code. In all the investigated cases, the generated magnetic fields are dominantly-dipolar. Convection is small-scale and columnar, while the magnetic field maintains its large-scale structure. In this study the generated magnetic field never becomes weak in the polar regions, neither at large magnetic Prandtl numbers (when the magnetic diffusion is weak), nor at low magnetic Prandtl numbers (when the magnetic diffusion is strong), which is a completely different situation to that observed in previous studies. As magnetic fields never become weak in the polar regions, then the magnetic field is always regenerated in the tangent cylinder. At both values of the magnetic Prandtl number, strong polar magnetic upwellings and weaker equatorial upwellings are observed. An occurrence of polar magnetic upwellings is coupled with a regenaration of magnetic fields inside the tangent cylinder and then with a not weakened intensity of magnetic fields in the polar regions. These new results indicate that inertia and viscosity are probably negligible at low Ekman numbers.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

DE - Earth magnetism, geodesy, geography

OECD FORD branch

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Project

<a href="/en/project/LG13042" target="_blank" >LG13042: Support of activities in management structures of International Association of Geomagnetism and Aeronomy (IAGA)</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Contributions to Geophysics & Geodesy

ISSN

1335-2806

e-ISSN

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Volume of the periodical

46

Issue of the periodical within the volume

3

Country of publishing house

SK - SLOVAKIA

Number of pages

24

Pages from-to

221-244

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85011596002