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Mejoras de partículas energéticas cerca del choque de terminación heliosférica
Frank B McDonald1, Edward C Stone, Alan C Cummings
1Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA. fm27@umail.umd.edu
Nature
|November 7, 2003
Resumen
La Voyager 1 detectó un aumento significativo de partículas energéticas, incluidos los rayos cósmicos, cerca de la heliosfera.
Área de la Ciencia:
- Física del espacio Física del espacio
- Heliofísica es la heliofísica.
- Física de los rayos cósmicos Física de los rayos cósmicos
Sus antecedentes:
- La Voyager 1 está explorando la heliosfera distante más allá de las 85 unidades astronómicas (au).
- El choque de terminación es un límite clave donde el viento solar supersónico se ralentiza.
- Se espera que esta región acelere varias partículas energéticas.
Objetivo del estudio:
- Informar y analizar un aumento único en las partículas energéticas observadas por la Voyager 1.
- Para interpretar estas observaciones en el contexto de la estructura de la heliosfera y la aceleración de partículas.
Principales métodos:
- Análisis de datos energéticos de iones y electrones de la Voyager 1.
- Comparación de las poblaciones de partículas observadas con las expectativas teóricas para la heliosfera.
Principales resultados:
- Se observó un aumento persistente de siete meses en los iones y electrones energéticos a partir de mediados de 2002.
- Este evento mostró un aumento simultáneo en los rayos cósmicos galácticos, los rayos cósmicos anómalos y los iones de baja energía.
- Las características anómalas de los rayos cósmicos sugieren que la Voyager 1 aún no ha alcanzado el choque de terminación.
Conclusiones:
- El aumento de partículas observado se interpreta como un evento precursor para alcanzar el choque de terminación.
- La baja anisotropía radial de los rayos cósmicos apoya la ubicación en la región de choque frontal.
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