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Ciencias planetarias. ciencias planetarias. Las mediciones de campo magnético de baja altitud por MESSENGER revelan
Catherine L Johnson1, Roger J Phillips2, Michael E Purucker3
1Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada. Planetary Science Institute, Tucson, AZ 85719, USA. cjohnson@eos.ubc.ca.
Science (New York, N.Y.)
|May 9, 2015
Resumen
Mercurio Mercurio Mercurio Mercurio es Mercurio.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geofísica es la geofísica.
- Exploración del espacio Exploración espacial
Sus antecedentes:
- Los campos magnéticos planetarios proporcionan información crucial sobre la estructura interna y la evolución de un planeta.
- Comprender la historia del campo magnético de Mercurio es clave para descifrar su pasado térmico y geológico.
Objetivo del estudio:
- Para investigar la presencia y la edad de la magnetización remanente en la corteza de Mercurio.
- Para limitar la historia y la fuerza del campo magnético global temprano de Mercurio.
Principales métodos:
- Análisis de las mediciones del campo magnético del vector orbital de las naves espaciales MMercury Surface, Space ENvironment, GEochemistry y Ranging (MESSENGER).
- Inferencia de la edad de magnetización de la corteza terrestre basada en datos del campo magnético a bajas altitudes.
Principales resultados:
- Detección de la magnetización remanente en la corteza de Mercurio.
- Límite inferior inferido para la edad promedio de magnetización entre 3.700 y 3.900 millones de años.
- Fuerzas de campo magnético antiguas comparables al campo actual de Mercurio o el campo de la Tierra.
Conclusiones:
- Mercurio poseía un campo magnético global temprano generado por procesos de dinamo de núcleo.
- El campo magnético probablemente funcionó desde hace al menos 3.900 millones de años.
- Las estimaciones de intensidad de campo son consistentes con los datos de MESSENGER y el bajo contenido de hierro en la corteza de Mercurio.
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