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Published on: July 1, 2019
Observaciones de plasma cerca de Urano: resultados iniciales del Voyager 2
Resumen
Urano posee una magnetosfera dinámica con distintos componentes de plasma cálido y caliente. Los datos de la Voyager 2 revelan que su estructura de cola magnética se asemeja a la de la Tierra, lo que sugiere una dinámica de plasma similar.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Física del espacio Física del espacio
- Física del plasma es la física del plasma.
Sus antecedentes:
- Anteriormente, la magnetosfera de Urano no se había caracterizado por completo.
- Comprender las magnetosferas planetarias proporciona información sobre el clima espacial y la evolución planetaria.
Objetivo del estudio:
- Para analizar el entorno de plasma y la magnetosfera de Urano.
- Para determinar las características y fuentes de plasma magnetosférico en Urano.
- Para comparar la estructura de la cola magnética de Urano con la de la Tierra.
Principales métodos:
- Mediciones extensas de iones y electrones positivos de baja energía utilizando instrumentos de naves espaciales.
- Análisis de la densidad y temperatura del plasma.
- Comparación de las estructuras de cola magnética observadas con modelos teóricos.
Principales resultados:
- Urano exhibe una magnetosfera completamente desarrollada con dos componentes plasmáticos distintos: un componente cálido (4-50 eV) y un componente caliente (algunos keV).
- El componente de plasma caliente está confinado fuera de la cubierta L = 5, mientras que el componente cálido existe tanto dentro como fuera de este límite.
- Las lunas de Urano no son una fuente significativa de plasma; las posibles fuentes incluyen la corona de hidrógeno, el viento solar y la ionosfera.
- Las observaciones de Voyager 2 de la hoja de plasma de la cola magnética se alinean con un modelo geométrico similar al de la Tierra.
Conclusiones:
- La magnetosfera de Urano es compleja, con distintas poblaciones y fuentes de plasma.
- El límite en L=5 puede estar influenciado por la luna Miranda o un sistema de convección impulsado por el viento solar.
- La cola magnética de Urano comparte similitudes estructurales con la de la Tierra, lo que indica procesos plasmáticos subyacentes comunes.
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