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La huella auroral de Encélado en Saturno
Wayne R Pryor1, Abigail M Rymer, Donald G Mitchell
1Science Department, Central Arizona College, Coolidge, Arizona 85128, USA.
Nature
|April 23, 2011
Resumen
Los científicos han detectado huellas aurorales vinculadas a la luna de Saturno Encélado. Estos hallazgos sugieren que la actividad de pluma variable de Encélado influye en la magnetosfera de Saturno, similar a las interacciones de las lunas de Júpiter.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Física del espacio Física del espacio
- Física de la magnetosfera Física de la magnetosfera Física de la magnetosfera Física de la magnetosfera Física de la magnetosfera Física de la magnetosfera Física de la magnetosfera
Sus antecedentes:
- Júpiter y Saturno poseen magnetosferas distintas, sin embargo, se proponen similitudes en las interacciones entre la luna y el planeta.
- La actividad criovolcánica en la luna de Saturno Encélado puede causar acoplamiento electrodinámico con Saturno, análogo a las interacciones de Júpiter con Io, Europa y Ganímedes.
- Observaciones anteriores predijeron que el acoplamiento entre Encelado y Saturno produciría auroras demasiado débiles para ser detectadas.
Objetivo del estudio:
- Investigar el potencial de las emisiones aurorales resultantes del acoplamiento electrodinámico entre Encelado y Saturno.
- Para detectar y caracterizar las huellas aurorales asociadas con Encelado.
Principales métodos:
- Análisis de datos de naves espaciales para identificar haces de iones y electrones alineados con el campo magnético.
- Observación y detección de las emisiones ultravioletas aurorales en la ionosfera de Saturno.
- Correlación de las señales aurorales con la posición de Encélado y la actividad del penacho.
Principales resultados:
- Detección de poderosos haces de iones y electrones alineados con el campo magnético que se originan aguas abajo de Encélado.
- Descubrimiento de huellas aurorales asociadas a Encelado en la ionosfera de Saturno, observadas en un pequeño porcentaje de escaneos.
- Variación significativa en la magnitud de la emisión auroral, que excede las explicaciones basadas únicamente en parámetros magnetosféricos.
Conclusiones:
- Los rayos de partículas detectados poseen suficiente energía para generar auroras observables.
- Los hallazgos confirman la aurora asociada a Encélado y sugieren que su variabilidad está relacionada con la actividad de pluma de Encélado.
- Este estudio proporciona evidencia de acoplamiento electrodinámico entre Encelado y Saturno, impulsado por procesos criovolcánicos.
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