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Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
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Una dinamo lunar de larga vida impulsada por una agitación mecánica continua.

C A Dwyer1, D J Stevenson, F Nimmo

  • 1Department of Earth and Planetary Sciences, University of California Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA. cadwyer@ucsc.edu

Nature
|November 11, 2011
PubMed
Resumen

La precesión impulsada por la Tierra puede haber alimentado el antiguo campo magnético de la Luna. Este modelo de agitación mecánica explica la dinamo lunar de larga duración y su eventual apagado a medida que la Luna se alejaba de la Tierra.

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Área de la Ciencia:

  • Ciencias planetarias Ciencias planetarias.
  • La geofísica es la geofísica.
  • La astrofísica es la astrofísica.

Sus antecedentes:

  • Las rocas lunares revelan un antiguo campo magnético, lo que sugiere una dínamo lunar.
  • Los modelos convencionales de dínamo luchan por explicar la existencia y duración de la dínamo de la Luna.
  • El campo magnético de la Luna persistió durante más de 400 millones de años.

Objetivo del estudio:

  • Para investigar la agitación mecánica como un mecanismo alternativo de generación de dínamo lunar.
  • Para modelar la generación de dínamo impulsada por el movimiento diferencial entre el manto y el núcleo de la Luna.

Principales métodos:

  • Investigó la agitación mecánica continua causada por la precesión impulsada por la Tierra del eje de giro lunar.
  • Modelado movimientos de fluidos y requisitos de potencia para una dínamo que funciona durante más de mil millones de años.
  • Analizó la generación de un campo magnético con una intensidad superior a un microtesla hace 4.200 millones de años.

Principales resultados:

  • La agitación mecánica genera fácilmente los movimientos de fluidos y la potencia necesarios para una dinamo lunar de larga duración.
  • El modelo predice una intensidad de campo magnético de más de un microtesla hace 4.200 millones de años.
  • Se prevé que la dínamo lunar se apague naturalmente a medida que la Luna se aleje de la Tierra.

Conclusiones:

  • La agitación mecánica proporciona un mecanismo viable para generar el antiguo campo magnético lunar.
  • La dínamo se apagó hace unos 2.700 millones de años cuando la Luna alcanzó aproximadamente 48 radios terrestres.
  • Los datos paleomagnéticos lunares podrían limitar la evolución orbital temprana de la Luna y aplicarse a otros cuerpos celestes.