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Partículas energéticas en la cola magnética joviana
R L McNutt1, D K Haggerty, M E Hill
1Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723, USA. ralph.mcnutt@jhuapl.edu
Science (New York, N.Y.)
|October 13, 2007
Resumen
La nave espacial Nuevos Horizontes exploró Júpiter y exploró Júpiter.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Física del espacio Física del espacio
- La astrofísica es la astrofísica.
Sus antecedentes:
- Júpiter posee un poderoso campo magnético que interactúa con el viento solar.
- Esta interacción forma una vasta cola magnética, un componente crucial del entorno espacial de Júpiter.
- Comprender la dinámica de la cola magnética es clave para los procesos de flujo de salida del sistema de Júpiter.
Objetivo del estudio:
- Para investigar la estructura y la dinámica de la cola magnética de Júpiter.
- Para analizar las poblaciones de partículas energéticas dentro de la cola magnética.
- Para identificar el comportamiento del plasma y los mecanismos de inyección potenciales en la magnetocola distante.
Principales métodos:
- Mediciones in situ realizadas por la nave espacial New Horizons.
- Atravesando toda la longitud de la cola magnética de Júpiter hasta más de 2500 radios jovianos.
- Análisis de dispersiones de velocidad de partículas energéticas, anisotropías y composición.
Principales resultados:
- Se observó una población de partículas energéticas multispecie de alta temperatura en toda la cola magnética.
- Se detectaron variaciones periódicas de ~ 3 días en la cola profunda (> 500 RJ), similares a las observaciones cercanas a Júpiter.
- Se identificaron firmas consistentes con el flujo de salida de plasma y posibles eventos de reconexión magnética en la región cercana a la cola (200-400 RJ).
Conclusiones:
- La cola magnética de Júpiter mantiene la coherencia a por lo menos 1655 RJ.
- Los eventos de flujo e inyección de plasma ocurren dentro de la cola magnética.
- La cola magnética juega un papel importante en la canalización de material fuera del sistema joviano.
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