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Aceleración discreta y de banda ancha de electrones en la poderosa aurora de Júpiter
B H Mauk1, D K Haggerty1, C Paranicas1
1The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA.
Nature
|September 8, 2017
Resumen
Júpiter también.
Área de la Ciencia:
- Física del espacio
- Ciencias planetarias
- Física del plasma
Sus antecedentes:
- Las auroras discretas de la Tierra son impulsadas por la aceleración de electrones a lo largo de los campos magnéticos.
- Se presume que la intensa aurora de Júpiter fue generada por procesos discretos similares.
- Las observaciones anteriores de la aurora de Júpiter carecían de evidencia para la aceleración discreta de electrones.
Objetivo del estudio:
- Para investigar los mecanismos detrás de las intensas emisiones aurorales de Júpiter.
- Para determinar si los procesos de aceleración de electrones discretos ocurren en Júpiter.
- Para comparar los procesos de aceleración auroral en Júpiter y la Tierra.
Principales métodos:
- Mediciones in situ de las regiones aurorales de Júpiter.
- Análisis de la aceleración de electrones de alta energía.
- Inferencia de potenciales eléctricos alineados con el campo magnético.
Principales resultados:
- Se observó una aceleración de electrones hacia abajo de alta energía en las regiones polares de Júpiter.
- Inferido hacia arriba potenciales eléctricos de hasta 400 kiloelectronvoltios, significativamente mayor que la de la Tierra.
- Encontró que la aceleración discreta contribuye con menos flujo de energía que los procesos de banda ancha / estocásticos en Júpiter.
Conclusiones:
- Júpiter experimenta una aceleración discreta de electrones, pero no es el motor principal de su aurora principal.
- Los mecanismos de transferencia de energía en la aurora de Júpiter difieren significativamente de los de la Tierra.
- Los potenciales eléctricos hacia arriba en Júpiter son sustancialmente más fuertes que los observados en la Tierra.
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