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Los haces de electrones y la composición iónica medida en Io y en su toroides
D J Williams1, B H Mauk, R E McEntire
1Johns Hopkins Applied Physics Laboratory, Johns Hopkins Road, Laurel, MD 20723, USA.
Science (New York, N.Y.)
|October 18, 1996
Resumen
Se descubrieron rayos de electrones energéticos que impactaron con Júpiter.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Física del espacio Física del espacio
- Física del plasma es la física del plasma.
Sus antecedentes:
- La luna de Júpiter, Io, es una fuente de intensa actividad volcánica, liberando gases y plasma en el sistema joviano.
- La interacción entre el toro de plasma de Io y la magnetosfera de Júpiter es compleja e influye en los procesos aurorales.
- Las poblaciones de partículas energéticas en las magnetosferas planetarias son cruciales para comprender la transferencia de energía y los fenómenos atmosféricos.
Objetivo del estudio:
- Para investigar las características de los haces de partículas energéticas observadas durante el sobrevuelo de Galileo de Io.
- Para determinar el potencial de estos rayos para generar auroras visibles en la atmósfera de Júpiter.
- Para analizar la distribución espacial y la composición de iones energéticos dentro del toro de Júpiter.
Principales métodos:
- Se utilizaron datos del detector de partículas energéticas Galileo.
- Se analizaron haces de electrones bidireccionales alineados con el campo magnético y con energías superiores a 15 keV.
- Se realizaron mediciones de la composición de los iones energéticos (protones, oxígeno, azufre) en el tórico Io.
Principales resultados:
- Descubrimiento de intensos haces de electrones energéticos bidireccionales (>15 keV) alineados con el campo magnético durante el sobrevuelo de Io.
- Estos haces de electrones poseen suficiente flujo de energía para crear potencialmente auroras visibles en la huella de Júpiter.
- Se encontró que las distribuciones espaciales de los protones energéticos, el oxígeno y los iones de azufre en el toro eran distintas, con azufre dominante (>10 keV / núcleo).
Conclusiones:
- Los rayos de electrones energéticos que se originan en las cercanías de Io pueden contribuir directamente a las exhibiciones aurorales de Júpiter.
- Las distintas distribuciones espaciales de los iones en el Ítoro resaltan los complejos procesos plasmáticos.
- Los iones de azufre son un componente significativo de la población de partículas energéticas en la magnetosfera interna de Júpiter.
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