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Una nebulosa de gases de Io que rodea a Júpiter
Stamatios M Krimigis1, Donald G Mitchell, Douglas C Hamilton
1Applied Physics Laboratory, Johns Hopkins University, 11100 Johns Hopkins Road, Laurel, Maryland 20723, USA. tom.krimigis@jhuapl.edu
Nature
|March 5, 2002
Resumen
Los científicos descubrieron un viento neutro rápido y caliente y átomos neutros energéticos que se extienden lejos de Júpiter. Estas partículas, originadas de gases volcánicos en Io, forman una vasta nebulosa alrededor del planeta, impactando su magnetosfera.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Física del plasma es la física del plasma.
- Física del espacio Física del espacio
Sus antecedentes:
- La magnetosfera de Júpiter alberga iones y electrones energéticos, con átomos neutros energéticos previamente detectados pero no identificados.
- La fuente y el significado de estos átomos neutros con respecto a la pérdida de partículas cargadas de Júpiter eran desconocidos.
Objetivo del estudio:
- Para identificar la fuente y las características de los átomos neutros energéticos en la magnetosfera de Júpiter.
- Comprender la formación y extensión de una "nebula" de partículas neutras alrededor de Júpiter.
Principales métodos:
- Utilizó la nave espacial Cassini para detectar y analizar átomos neutros energéticos y un viento neutro magnetosférico.
- Velocidades de partículas medidas y orígenes inferidos a través de interacciones electromagnéticas.
Principales resultados:
- Descubrió un viento neutro magnetosférico rápido (>103 km/s) y caliente que se extiende a más de 0,5 unidades astronómicas de Júpiter.
- Identificó átomos neutros energéticos calientes y fríos acelerados por los campos eléctricos del viento solar.
- Propuso gases volcánicos de la luna Io de Júpiter como el origen de estos átomos.
Conclusiones:
- Los átomos neutros energéticos originados en los gases volcánicos de Io evolucionan a través de interacciones electromagnéticas y escapan de la magnetosfera de Júpiter.
- Estos átomos que escapan crean una vasta "nebula" que se extiende cientos de radios jovianos, influyendo en el entorno espacial circundante.
- Este descubrimiento arroja luz sobre los mecanismos de escape de partículas y el entorno de plasma extendido de los planetas gigantes.
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