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Las intensas ondas de plasma en y cerca del viento solar terminan con el choque de terminación del viento solar
1Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA. donald-gurnett@uiowa.edu
Nature
|July 4, 2008
Resumen
La Voyager 2 detectó intensas ondas de plasma en el choque de terminación del viento solar. Estos campos eléctricos, similares a los de los golpes de arco planetario, son cruciales para la disipación de energía y el reequilibrio de partículas.
Área de la Ciencia:
- Física del espacio Física del espacio
- Física del plasma es la física del plasma.
- Heliofísica es la heliofísica.
Sus antecedentes:
- Las ondas de plasma son generadas por distribuciones de partículas no térmicas en capas de transición de choque.
- Los campos eléctricos de estas ondas juegan un papel vital en la disipación de la energía de choque y la termialización de las partículas.
Objetivo del estudio:
- Para informar de la detección de intensos campos eléctricos de ondas de plasma en el choque de terminación del viento solar.
- Para caracterizar la naturaleza de estas ondas y compararlas con fenómenos similares en otros choques astrofísicos.
Principales métodos:
- Utilizó el instrumento de ondas de plasma a bordo de la nave espacial Voyager 2.
- Se analizaron datos para las oscilaciones del plasma de electrones aguas arriba y explosiones de ondas electrostáticas de banda ancha.
Principales resultados:
- Se detectaron oscilaciones de plasma de electrones aguas arriba a partir del 1 de agosto de 2007, a 83,4 unidades astronómicas (au).
- Se observaron intensos estallidos de ondas electrostáticas de banda ancha durante cruces de choque de terminación entre el 31 de agosto y el 1 de septiembre de 2007, a 83,7 au.
- Encontró que el espectro de ondas es cuantitativamente similar a los observados en los golpes de arco planetario.
Conclusiones:
- Las ondas detectadas proporcionan evidencia directa de campos eléctricos intensos en el choque de terminación del viento solar.
- La similitud con las ondas de choque del arco planetario sugiere procesos físicos comunes que gobiernan las interacciones de choque en diferentes entornos de plasma.
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