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Los granos de polvo caen desde el anillo D de Saturno a su atmósfera superior ecuatorial

D G Mitchell¹, M E Perry², D C Hamilton³

¹Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA. donald.g.mitchell@jhuapl.edu.

Science (New York, N.Y.)

|October 6, 2018

Resumen

Saturno también.

Área de la Ciencia:

Ciencias planetarias
Aeronomía
Física del espacio

Sus antecedentes:

Los anillos de Saturno contienen partículas que van desde rocas hasta polvo de tamaño nanométrico.
La edad de los anillos de Saturno está relacionada con los procesos de pérdida de polvo, como el transporte a la atmósfera del planeta.
Comprender el transporte de polvo es crucial para determinar las edades de los anillos.

Objetivo del estudio:

Para investigar el transporte de polvo de tamaño nanométrico desde el anillo D de Saturno a la atmósfera del planeta.
Para caracterizar los mecanismos que impulsan este transporte de polvo durante las órbitas finales de la nave espacial Cassini.

Principales métodos:

Utilizó datos del instrumento de imágenes magnetosféricas (MIMI) a bordo de la nave espacial Cassini.
Analizaron las mediciones de pequeños granos de polvo en el anillo D más interno de Saturno.
Investiga las colisiones de polvo con hidrógeno exosférico e hidrógeno molecular.

Principales resultados:

Detectado y caracterizado el transporte de polvo de tamaño nanométrico desde el anillo D a la ionosfera y la atmósfera de Saturno.
Se observó que la difusión es el proceso dominante por encima y cerca de las altitudes máximas de densidad ionosférica.
Cuantificó una tasa de deposición de masa de aproximadamente 5 kilogramos por segundo en la atmósfera ecuatorial.

Conclusiones:

El estudio proporciona un mecanismo para la pérdida de polvo de los anillos de Saturno.
La tasa de deposición de masa cuantificada ayuda a restringir la edad del anillo D.
Esta investigación mejora nuestra comprensión de las interacciones anillo-atmósfera en Saturno.

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