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A Study of the Complexation of Mercury(II) with Dicysteinyl Tetrapeptides by Electrospray Ionization Mass Spectrometry
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La compleja exosfera de Mercurio: resultados del tercer sobrevuelo de MESSENGER
Ronald J Vervack1, William E McClintock, Rosemary M Killen
1Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA. Ron.Vervack@jhuapl.edu
Science (New York, N.Y.)
|July 22, 2010
Resumen
MESSENGER detectó calcio ionizado en la cola magnética de Mercurio, lo que sugiere una convección interna de fotoiones. Distribuciones exosféricas distintas de sodio, calcio y magnesio indican complejos procesos de control para la tenue atmósfera de Mercurio.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Física del espacio Física del espacio
- La espectroscopia es una técnica de espectroscopia.
Sus antecedentes:
- Mercurio posee una exosfera tenue y una magnetosfera dinámica.
- Las observaciones anteriores han insinuado especies exosféricas, pero carecían de información espacial y de composición detallada.
Objetivo del estudio:
- Para investigar la composición y distribución de la exosfera y magnetosfera de Mercurio.
- Comprender los procesos que controlan las especies exosféricas, como la fotoionización y el transporte magnetosférico.
Principales métodos:
- Utilizando el espectrómetro de composición atmosférica y superficial de Mercurio (MASCS) a bordo de la nave espacial MESSENGER.
- Analizar las emisiones espectrales durante los sobrevuelos para identificar y cuantificar los elementos exosféricos.
Principales resultados:
- Detección de emisión de calcio ionizado 1-2 Radios de mercurio hacia la cola, apoyando la convección magnetosférica hacia la cola de los fotoiones.
- Distribuciones de altitud distintas para el sodio, el calcio y el magnesio neutros por encima de los polos de Mercurio.
- Evidencia de una distribución de sodio de dos componentes y distribuciones asimétricas de magnesio.
Conclusiones:
- La convección magnetosférica juega un papel importante en el transporte de fotoiones dentro de la magnetosfera de Mercurio.
- Múltiples procesos específicos de cada especie gobiernan la distribución de los elementos en la exosfera de Mercurio.
- La complejidad de la exosfera requiere un estudio detallado de las especies individuales y sus interacciones.
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