Magnetic and velocity fields in a dynamo operating at extremely small Ekman and magnetic Prandtl numbers

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F17%3A00486241" target="_blank" >RIV/67985530:_____/17:00486241 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1515/congeo-2017-0014" target="_blank" >http://dx.doi.org/10.1515/congeo-2017-0014</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1515/congeo-2017-0014" target="_blank" >10.1515/congeo-2017-0014</a>

Result language
angličtina
Original language name
Magnetic and velocity fields in a dynamo operating at extremely small Ekman and magnetic Prandtl numbers
Original language description
Numerical simulations of the geodynamo are becoming more realistic becausenof advances in computer technology. Here, the geodynamo model is investigated numerically at the extremely low Ekman and magnetic Prandtl numbers using the PARODY dynamo code. These parameters are more realistic than those used in previous numerical studies of the geodynamo. Our model is based on the Boussinesq approximation and the temperature gradient between upper and lower boundaries is a source of convection. This study attempts to answer the question how realistic the geodynamo models are. Numerical results show that our dynamo belongs to the strong-field dynamos. The generated magnetic field is dipolar and large-scale while convection is small-scale and sheet-like flows (plumes) are preferred to a columnar convection. Scales of magnetic and velocity fields are separated, which enables hydromagnetic dynamos to maintain the magnetic field atnthe low magnetic Prandtl numbers. The inner core rotation rate is lower than that innprevious geodynamo models. On the other hand, dimensional magnitudes of velocity and magnetic fields and those of the magnetic and viscous dissipation are larger than those expected in the Earth’s core due to our parameter range chosen.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10508 - Physical geography

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
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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