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Building up a Unified Theory of Stellar Dynamos

Descripción del proyecto

Revelación del mecanismo de los campos magnéticos ordenados en el Universo

Los campos magnéticos permean una gran parte del cosmos. Una observación increíble es que casi ningún cuerpo celeste con campos magnéticos presenta una red entrelazada, sino una estructura magnética ordenada. Los campos magnéticos ordenados son tan abundantes en nuestro universo caótico que confunden a los astrónomos que quieren descubrir de dónde vienen y cómo persisten en este caos. Las teorías vanguardistas no consiguen explicar suficientemente cómo surge este orden, especialmente en estrellas de tipo solar como el Sol. El proyecto UniSDyn, financiado con fondos europeos, tiene previsto desarrollar simulaciones y herramientas de análisis de datos novedosas para describir con más precisión los procesos de la dínamo en los objetos celestes, es decir, los mecanismos que les permiten generar campos magnéticos.

Objetivo

Magnetic fields are ubiquitous in the universe. The special property of cosmic magnetism is that, in the majority of objects hosting magnetic fields, those fields are organized, such that some meaningful averaging can reveal global structure and systematic behavior. In the Sun, averaging over longitude reveals the equatorward migration of the emergence region of the sunspots, forming the famous butterfly diagram. Further, vigorous turbulence is present in a wide variety of astrophysical systems, and yet they still exhibit organized magnetic fields. These observations prompt the search for a theory to explain how order can arise and sustain itself in such chaos. We claim that the available theories are incomplete, especially in the case of solar-like stars which becomes apparent if we view the Sun as one star among many. We propose a coherent plan of advancement in which each theory shall be tested by requiring it also to explain the cyclic dynamo action seen in more active rapid rotators.

UNISDYN project attacks these very problems with novel simulations and data analysis tools. Our path to resolve them is to enhance the state-of-the-art stellar dynamo models with the relevant descriptions of the turbulent processes. This goal is reached in three steps. (i) We will produce improved convection dynamo simulations to serve as laboratories from which (ii) the turbulent transport coefficients are directly measured with a novel test methods suite. (iii) Finally, global dynamo models incorporating the turbulent effects in full are constructed based on (i) and (ii) results. These results will allow us to unify stellar dynamo theory for solar-like inactive and rapidly rotating active stars. The developed toolbox has direct applications in other fields of astrophysics, such as accretion and galactic disk dynamos, and industry, such as combustion engines and fusion reactors.

Régimen de financiación

ERC-COG - Consolidator Grant

Institución de acogida

AALTO KORKEAKOULUSAATIO SR
Aportación neta de la UEn
€ 1 023 062,50
Dirección
OTAKAARI 1
02150 Espoo
Finlandia

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Región
Manner-Suomi Helsinki-Uusimaa Helsinki-Uusimaa
Tipo de actividad
Higher or Secondary Education Establishments
Enlaces
Coste total
€ 1 023 062,50

Beneficiarios (2)