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Un punto caliente de rayos X auroral pulsante en Júpiter
G R Gladstone1, J H Waite, D Grodent
1Southwest Research Institute, San Antonio, Texas 78228, USA. randy@whistler.space.swri.edu
Nature
|March 5, 2002
Resumen
Las auroras de rayos X de Júpiter no son causadas principalmente por iones de la magnetosfera interna. Nuevas observaciones revelan un "punto caliente" pulsante en la magnetosfera externa, lo que sugiere que procesos desconocidos impulsan estas intensas emisiones aurorales.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Física del espacio Física del espacio
- La astrofísica es la astrofísica.
Sus antecedentes:
- Las auroras de rayos X de Júpiter se atribuían previamente a los iones energéticos de azufre y oxígeno de la magnetosfera interna.
- Se creía que esta precipitación era el principal impulsor de las emisiones de rayos X en las regiones polares del planeta.
Objetivo del estudio:
- Para investigar la fuente y las características de las emisiones aurorales de rayos X de Júpiter utilizando observaciones de alta resolución espacial.
- Desafiar y refinar los modelos existentes de los mecanismos de excitación de las auroras jovianas.
Principales métodos:
- Observaciones de rayos X de alta resolución espacial de las regiones aurorales del norte de Júpiter.
- Análisis de las ubicaciones de emisión, variaciones temporales y correlación con otros fenómenos electromagnéticos.
Principales resultados:
- La mayoría de los rayos X de las auroras del norte se originan en un "punto caliente" distinto hacia el polo de las latitudes de conexión de la magnetosfera interna.
- Este punto caliente exhibe latitud y longitud magnéticas fijas, co-localizadas con emisiones anómalas infrarrojas y ultravioletas.
- Las pulsaciones de rayos X ocurren con un período de ~45 minutos, coincidiendo con ráfagas de radio y electrones de altas latitudes.
Conclusiones:
- La fuente primaria de partículas que excitan las auroras de rayos X de Júpiter es la magnetosfera externa, no la magnetosfera interna.
- Los hallazgos invalidan las teorías anteriores de la precipitación constante de iones pesados.
- Procesos inexplicables de la magnetosfera externa probablemente generan estas emisiones de rayos X localizadas, variables y de banda ancha.
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