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Entorno de plasma caliente en Júpiter: los resultados de la Voyager 2
Resumen
Los datos de la Voyager 2 revelan que la magnetosfera de Júpiter está llena de plasma caliente, que fluye hacia afuera como un "viento magnetosférico" más allá de 150 radios de Júpiter. Este entorno de plasma está limitado por un límite, no por una magnetopausa convencional.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Física del plasma es la física del plasma.
- Física del espacio Física del espacio
Sus antecedentes:
- El entorno de plasma de la magnetosfera joviana es complejo y no se entiende completamente.
- Los modelos anteriores sugerían una magnetopausa convencional, pero faltaba la medición directa.
Objetivo del estudio:
- Para investigar el entorno de plasma caliente de la magnetosfera de Júpiter utilizando los datos de la Voyager 2.
- Para caracterizar la composición del plasma, la densidad, la energía y la dinámica de flujo.
Principales métodos:
- Análisis de los datos del instrumento de partículas cargadas de baja energía (LECP) de Voyager 2.
- Medidas de las energías iónicas, densidades y densidades de energía.
- Cálculo de las velocidades de flujo de plasma utilizando el formalismo de Compton-Getting.
Principales resultados:
- La magnetosfera de Júpiter está poblada por un plasma caliente y multicomponente (iones H, O, S) que se extiende hasta al menos 30 radios de Júpiter.
- El plasma fluye corotativamente hasta el límite magnetosférico, luego forma un "viento magnetosférico" más allá de 150 radios de Júpiter.
- Se identificó una discontinuidad a 50-60 radios de Júpiter, denominada la "plasmasfera interna", con distintas proporciones de composición de plasma.
Conclusiones:
- La magnetosfera joviana está limitada por un límite de plasma, no por una magnetopausa convencional.
- El "viento magnetosférico" observado indica un flujo de plasma hacia afuera desde Júpiter.
- La plasmasfera interna representa una región distinta dentro de la magnetosfera de Júpiter con características plasmáticas únicas.
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