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Las mediciones de polvo de Cassini en Encelado y las implicaciones para el origen del anillo E
Frank Spahn1, Jürgen Schmidt, Nicole Albers
1Institut für Physik, Universität Potsdam, Am Neuen Palais 10, Haus 19, D-14469 Potsdam, Germany.
Science (New York, N.Y.)
|March 11, 2006
Resumen
Los datos de la nave espacial Cassini revelaron partículas de polvo de tamaño micrométrico alrededor de la luna de Saturno Encélado. Este polvo probablemente se origina en la región polar sur geofísicamente activa de Encélado, contribuyendo al anillo E de Saturno.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Astrogeología y Astrogeología.
- Física del espacio Física del espacio
Sus antecedentes:
- El anillo E de Saturno es un anillo difuso compuesto principalmente de partículas de hielo.
- Encélado, una luna de Saturno, exhibe evidencia de actividad geológica, incluyendo penachos y una cálida región polar sur.
Objetivo del estudio:
- Para investigar la fuente de las partículas de polvo detectadas alrededor de Encélado durante la misión Cassini.
- Para determinar si Encelado es un contribuyente significativo en el anillo E de Saturno.
Principales métodos:
- Análisis de los datos del analizador de polvo cósmico (CDA) en la nave espacial Cassini.
- Correlación de los datos de impacto de polvo con la trayectoria de la nave espacial y otros hallazgos experimentales de Cassini.
Principales resultados:
- El detector de alta velocidad registró un pico en los impactos de partículas de polvo de tamaño micrométrico cerca de Encélado, que precede al acercamiento más cercano.
- Una firma asimétrica de polvo sugiere una producción localizada de polvo en la región polar sur de Encélado.
- Datos concurrentes de Cassini indicaron actividad geofísica (alta temperatura de la superficie, liberación de gas de agua) en la misma región.
Conclusiones:
- Encélado es una fuente probable de partículas de polvo detectadas alrededor de la luna.
- Los procesos geofísicos en la región polar sur de Encelado son responsables de la producción de polvo.
- Encélado es uno de los principales contribuyentes al anillo E de Saturno.
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