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Puntos de flujo ecuatorial intenso en la superficie del núcleo de la Tierra
1School of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK. a.jackson@earth.leeds.ac.uk
Nature
|August 15, 2003
Resumen
Nuevos datos satelitales revelan puntos de flujo magnético intenso en la superficie del núcleo de la Tierra, lo que desafía los modelos anteriores de la geodinámica. Estas características ecuatoriales pueden indicar estructuras de fluidos profundos o movimiento de ondas.
Área de la Ciencia:
- La geofísica es la geofísica.
- El campo magnético de la Tierra.
- La dinámica del núcleo.
Sus antecedentes:
- Las mediciones vectoriales de alta precisión del campo magnético de la Tierra son cruciales para comprender su interior profundo.
- Datos anteriores de Magsat y datos recientes del satélite Oersted proporcionan información sobre la morfología del campo magnético.
Objetivo del estudio:
- Para inferir la morfología del campo magnético en el límite núcleo-manto utilizando datos satelitales recientes.
- Para investigar la naturaleza y el origen de las características de flujo magnético intenso en la superficie del núcleo.
Principales métodos:
- Aplicación de una nueva metodología para analizar los datos de campo magnético vectorial de los satélites Oersted y Magsat.
- Cálculo de mapas de campo magnético en la superficie del núcleo (aprox. 2.900 km de profundidad).
Principales resultados:
- Identificación de puntos de flujo magnético intenso en regiones ecuatoriales de la superficie del núcleo.
- Las intensidades de las manchas de flujo ecuatorial observadas son comparables a las manchas polares de latitudes altas.
- Evidencia de manchas emparejadas cerca del ecuador, lo que sugiere estructuras columnares en el núcleo fluido.
Conclusiones:
- Las manchas de flujo ecuatorial representan un componente significativo del campo magnético de la Tierra, potencialmente vinculado a la dinámica de fluidos del núcleo.
- La deriva de estas características puede indicar flujo de material o movimiento de ondas dentro del núcleo.
- El análisis de datos futuros puede ayudar a diferenciar entre el flujo y el movimiento de ondas, informando sobre la intensidad del campo magnético toroidal.
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