Hydromagnetic dynamos at the low Ekman and magnetic Prandtl numbers
The result's identifiers
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>
Alternative languages
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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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DE - Earth magnetism, geodesy, geography
OECD FORD branch
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Result continuities
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
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
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