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MESSENGER observaciones de la reconexión magnética en la magnetosfera de Mercurio
James A Slavin1, Mario H Acuña, Brian J Anderson
1Heliophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA. james.a.slavin@nasa.gov
Science (New York, N.Y.)
|May 2, 2009
Resumen
La magnetosfera de Mercurio es altamente sensible a la transferencia de energía del viento solar, con una reconexión magnética que ocurre a tasas ~ 10 veces más altas que la de la Tierra. Esto indica una mayor susceptibilidad planetaria al clima espacial.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Física del espacio Física del espacio
- La magnetohidrodinámica es una dinámica magnetohidrodinámica.
Sus antecedentes:
- La transferencia de energía del viento solar a las magnetosferas planetarias se rige por la reconexión magnética.
- La reconexión magnética dicta la conectividad entre el campo magnético interplanetario (FMI) y el campo magnético de un planeta.
Objetivo del estudio:
- Para investigar la velocidad y los efectos de la reconexión magnética en Mercurio durante la misión MESSENGER.
- Para comparar la respuesta magnetosférica de Mercurio a las variaciones del FMI con la de la Tierra.
Principales métodos:
- Análisis de los datos del segundo sobrevuelo de MESSENGER por Mercurio.
- Observación del campo magnético interplanetario (FMI) y la magnetosfera de Mercurio.
Principales resultados:
- Se observó un FMI constante hacia el sur y una magnetopausa enhebrada por un fuerte campo magnético.
- Se estimó que las tasas de reconexión en Mercurio eran ~ 10 veces más altas que las típicas en la Tierra.
- Se detectaron evidencias de productos de reconexión, incluido un gran evento de transferencia de flujo, plasmoides y regiones de compresión móviles en la cola magnética de Mercurio.
Conclusiones:
- La magnetosfera de Mercurio es significativamente más sensible a la dirección del FMI que la de la Tierra u otros planetas magnetizados.
- La magnetosfera del planeta está dominada por los efectos de la reconexión magnética.
- Mercurio experimenta un mayor grado de transferencia de energía eólica solar debido a una mayor reconexión.
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