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Las oscilaciones de dientes de sierra de la magnetosfera inducidas por el flujo de salida ionosférico
O J Brambles1, W Lotko, B Zhang
1Thayer School of Engineering, Dartmouth College, Hanover, NH, USA. ojbrambles@dartmouth.edu
Science (New York, N.Y.)
|June 4, 2011
Resumen
La magnetosfera de la Tierra exhibe oscilaciones de dientes de sierra, impulsadas por las interacciones del viento solar. Las salidas de O (((+) ionosféricas son clave, ya que expulsan plasma y causan cambios en el campo magnético.
Área de la Ciencia:
- Física del espacio Física del espacio
- La geofísica es la geofísica.
- Física del plasma es la física del plasma.
Sus antecedentes:
- La magnetosfera de la Tierra exhibe oscilaciones periódicas de dientes de sierra.
- Estas oscilaciones son a escala planetaria y ocurren cada 2-4 horas.
- La interacción entre el viento solar, la magnetosfera y la ionosfera (SW-M-I) impulsa estas oscilaciones.
Objetivo del estudio:
- Investigar el papel de las salidas de O (((+) ionosféricas en la generación de oscilaciones de dientes de sierra.
- Comprender los mecanismos que impulsan la dinámica magnetosférica durante estos eventos.
Principales métodos:
- Utilizó simulaciones globales del geoespacio.
- Se analizó el impacto de las salidas de O (((+) ionosféricas en la magnetosfera interna.
Principales resultados:
- Los flujos de salida de O (((+) ionosféricos se identificaron como un generador de oscilaciones de dientes de sierra.
- Los iones que fluyen hacia afuera aumentan la presión, distanciando el campo magnético del lado nocturno.
- Exceder un umbral de flujo de salida conduce a la eyección plasmóide y la dipolarización del campo magnético.
Conclusiones:
- Las salidas de O (((+) ionosféricas son cruciales para la generación de la oscilación del diente de sierra.
- La fuerza de interacción SW-M-I controla la fluencia de salida y el período de oscilación.
- La dinámica de la magnetosfera cambia entre eventos de convección casi constante y eventos de eyección dinámica.
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