Magnetic fields generated by hydromagnetic dynamos at the low Prandtl number in dependence on the Ekman and magnetic Prandtl numbers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F13%3A00390288" target="_blank" >RIV/67985530:_____/13:00390288 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.pepi.2012.11.002" target="_blank" >http://dx.doi.org/10.1016/j.pepi.2012.11.002</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.pepi.2012.11.002" target="_blank" >10.1016/j.pepi.2012.11.002</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Magnetic fields generated by hydromagnetic dynamos at the low Prandtl number in dependence on the Ekman and magnetic Prandtl numbers

Popis výsledku v původním jazyce

This article investigates the dependence of hydromagnetic dynamos on the magnetic Prandtl number at low Prandtl number. In all the investigated cases, the generated magnetic fields are dipolar and neither transition to hemispherical dynamos nor weaker magnetic fields (which are less dipole dominated) were observed, although the inertia becomes important. The magnetic field becomes weak in the polar regions (is convected out of polar regions??) only for low Prandtl numbers, when the inertia becomes important. It is a basic condition. However, whether the magnetic field gets weak in the polar regions (is convected out of polar regions??) or not depends also on the magnetic Prandtl number. The magnetic Prandtl number has to exceed a minimum value in orderto sustain dynamo action. If the magnetic diffusion is small (large magnetic Prandtl numbers) then this phenomenon does not exist but if it is large (small magnetic Prandtl numbers) it exists because the strong magnetic diffusion signifi

Název v anglickém jazyce

Magnetic fields generated by hydromagnetic dynamos at the low Prandtl number in dependence on the Ekman and magnetic Prandtl numbers

Popis výsledku anglicky

This article investigates the dependence of hydromagnetic dynamos on the magnetic Prandtl number at low Prandtl number. In all the investigated cases, the generated magnetic fields are dipolar and neither transition to hemispherical dynamos nor weaker magnetic fields (which are less dipole dominated) were observed, although the inertia becomes important. The magnetic field becomes weak in the polar regions (is convected out of polar regions??) only for low Prandtl numbers, when the inertia becomes important. It is a basic condition. However, whether the magnetic field gets weak in the polar regions (is convected out of polar regions??) or not depends also on the magnetic Prandtl number. The magnetic Prandtl number has to exceed a minimum value in orderto sustain dynamo action. If the magnetic diffusion is small (large magnetic Prandtl numbers) then this phenomenon does not exist but if it is large (small magnetic Prandtl numbers) it exists because the strong magnetic diffusion signifi

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DE - Zemský magnetismus, geodesie, geografie

OECD FORD obor

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Projekt

<a href="/cs/project/IAA300120704" target="_blank" >IAA300120704: Numerické modelování hydromagnetických procesů a geodynama v jádře Země</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

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

Název periodika

Physics of the Earth and Planetary Interiors

ISSN

0031-9201

e-ISSN

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Svazek periodika

217

Číslo periodika v rámci svazku

April

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

22-30

Kód UT WoS článku

000318382100003

EID výsledku v databázi Scopus

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