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La Voyager 1 explora la región de choque de terminación y la heliosfera más allá
E C Stone1, A C Cummings, F B McDonald
1California Institute of Technology, Pasadena, CA 91125, USA. ecs@srl.caltech.edu
Science (New York, N.Y.)
|September 24, 2005
Resumen
La Voyager 1 entró en la cubierta heliocéntrica, revelando el choque de terminación como una fuente de protones de baja energía. El helio de los rayos cósmicos anómalos no alcanzó su punto máximo en el choque, desafiando las predicciones anteriores.
Área de la Ciencia:
- La física espacial es la física del espacio.
- Heliofísica es la heliofísica.
- Ciencias planetarias Ciencias planetarias.
Sus antecedentes:
- La Voyager 1 cruzó el choque de terminación del Sol en diciembre de 2004.
- Esto marcó el comienzo de la exploración de la heliosfera, la capa externa de la heliosfera.
Objetivo del estudio:
- Para analizar las propiedades del choque de terminación.
- Para investigar la fuente de los rayos cósmicos anómalos (ACR).
Principales métodos:
- Mediciones in situ realizadas por la nave espacial Voyager 1.
- Análisis de los espectros de energía de protones, electrones, ACR y rayos cósmicos galácticos.
Principales resultados:
- El choque de terminación es una fuente constante de protones de baja energía (0.53.5 MeV) con un espectro de energía específico.
- La intensidad del anómalo helio de los rayos cósmicos no alcanzó su punto máximo en el momento del choque.
- Las intensidades de electrones ~10 MeV, ACR y rayos cósmicos galácticos han aumentado desde 2004 debido a la disminución de la modulación solar.
Conclusiones:
- El choque de terminación es un choque débil (ratio de salto de velocidad r = 2,6).
- La fuente ACR no se encuentra en la región de choque cerca de la Voyager 1.
- Los datos de la Voyager 1 proporcionan nuevos conocimientos sobre el límite exterior de la heliosfera y la propagación de los rayos cósmicos.
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