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Búsqueda de la salida: Voyager 1 en el límite de la heliosfera con la galaxia
S M Krimigis1, R B Decker, E C Roelof
1Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723, USA. tom.krimigis@jhuapl.edu
Science (New York, N.Y.)
|July 2, 2013
Resumen
La Voyager 1 detectó una fuerte disminución en las partículas energéticas solares y un aumento en los rayos cósmicos galácticos en el límite de la cubierta heliosférica. Esta región marca una transición entre el plasma solar y el medio interestelar.
Área de la Ciencia:
- Física del espacio Física del espacio.
- Heliofísica es la heliofísica.
- La astrofísica es la astrofísica.
Sus antecedentes:
- La Voyager 1 se encuentra a 123 unidades astronómicas del Sol, atravesando la región de interfaz entre la cubierta heliosférica y el medio interestelar local.
- La cubierta heliosférica se caracteriza por el plasma solar calentado, mientras que el medio interestelar contiene frío, plasma no solar y el campo magnético galáctico.
Objetivo del estudio:
- Para reportar las mediciones de partículas cargadas energéticas en el límite de la cubierta heliomagnética.
- Para analizar los cambios en las intensidades de las partículas solares y galácticas en esta interfaz.
Principales métodos:
- Mediciones de partículas cargadas energéticamente (>40 kiloelectronvoltios) utilizando el Voyager 1.
- Análisis de los cambios en la intensidad de las partículas en diferentes direcciones (azimutal, radial, antiradial).
Principales resultados:
- El 25 de agosto de 2012, se observó una disminución por un factor de >10(3) en las partículas energéticas solares.
- Se produjo simultáneamente un aumento del 9,3% en los rayos cósmicos galácticos.
- Los cambios de intensidad se observaron secuencialmente en las direcciones azimutal, luego radial y antirradial.
Conclusiones:
- Se identificó una inesperada "región de agotamiento" heliosférica en el límite de la cubierta heliosférica.
- Esta región puede representar una zona de transición entre el plasma solar y la galaxia.
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