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La desaceleración del hidrógeno interestelar en la interfaz heliosférica
Science (New York, N.Y.)
|May 21, 1993
Resumen
El hidrógeno neutro de la nube interestelar local se ralentiza en el sistema solar.
Área de la Ciencia:
- La astronomía y la astrofísica.
- El Medio Interestelar es el medio interestelar.
- Física de la heliosfera Física de la heliosfera es la física de la heliosfera.
Sus antecedentes:
- Los espectros estelares de alta resolución revelan líneas de absorción de la nube interestelar local.
- Esta nube se mueve a 26 km/s con respecto al Sol, alineándose con el viento interestelar.
- Mediciones anteriores indicaron diferentes velocidades para el hidrógeno neutro y el helio dentro del sistema solar.
Objetivo del estudio:
- Para investigar las velocidades del hidrógeno neutro y el helio de la nube interestelar local dentro del sistema solar.
- Para determinar la interacción del material interestelar con la interfaz heliosférica.
- Para restringir la densidad del plasma interestelar y la ubicación del choque heliosférico.
Principales métodos:
- Análisis de espectros de alta resolución de estrellas cercanas para estudiar el material de la nube interestelar.
- Utilizando datos de la nave espacial Ulysses para mediciones de deriva de helio neutro.
- Empleando el Espectrógrafo de Alta Resolución del Telescopio Espacial Hubble para nuevas mediciones de la línea de emisión de hidrógeno.
Principales resultados:
- El helio neutro de la nube interestelar local se desplaza a 26 km/s, en consonancia con el viento interestelar.
- El hidrógeno neutro de la misma nube se desacelera a 20 km/s.
- Esta desaceleración se atribuye al intercambio de carga con protones interestelares en la interfaz heliosférica.
Conclusiones:
- Los átomos de hidrógeno neutros son preferentemente ralentizados por las interacciones con el plasma heliosférico.
- El helio neutro no se ve afectado por el plasma, lo que indica una interacción selectiva.
- La desaceleración observada implica una densidad de plasma interestelar de 0.060.10 cm-3, colocando el choque heliosférico dentro de las 100 UA del Sol.
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