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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

  • Czech description

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

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

  • 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

  • EID of the result in the Scopus database

    2-s2.0-85011596002