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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
Published on: December 22, 2018
Un mecanismo de filamentación de corriente para romper las líneas de campo magnético durante la reconexión
1Center For Integrated Plasma Studies, Department of Physics, University of Colorado, Boulder, Colorado 80309, USA. haihong.che@colorado.edu
Nature
|June 3, 2011
Resumen
Anteriormente se pensaba que la reconexión magnética, crucial para las erupciones solares, era impulsada por la turbulencia. Nuevas simulaciones revelan que las capas de corriente intensa se desintegran en filamentos, aumentando abruptamente las tasas de reconexión.
Área de la Ciencia:
- La física del plasma es la física del plasma.
- La astrofísica es la astrofísica.
- La física espacial es la física del espacio.
Sus antecedentes:
- La reconexión magnética libera energía en erupciones solares y eventos astrofísicos.
- El mecanismo exacto para romper las líneas de campo magnético no ha sido claro.
- Las teorías anteriores invocaban la resistividad anómala y el transporte del momento térmico.
Objetivo del estudio:
- Investigar los mecanismos primarios que controlan la reconexión magnética en plasmas de alta energía.
- Desafiar las teorías existentes sobre la dinámica de reconexión magnética.
Principales métodos:
- Simulaciones avanzadas por computadora del comportamiento del plasma durante la reconexión magnética.
- Análisis de la dinámica del plasma en regímenes donde los campos magnéticos dominan el presupuesto energético.
Principales resultados:
- No se encontró que ni la resistividad anómala ni el transporte del momento térmico fueran los principales factores.
- Las capas de corriente intensa se desintegran en una red filamentosa.
- Esta estructura filamentaria aumenta abruptamente la velocidad de reconexión magnética.
Conclusiones:
- La desintegración de las capas de corriente en filamentos es el mecanismo clave para la reconexión magnética rápida.
- Este hallazgo ofrece una nueva perspectiva sobre la liberación de energía en el espacio y los plasmas de laboratorio.
- Los futuros satélites y experimentos de laboratorio podrán verificar estos resultados de simulación mediante la medición de la turbulencia electromagnética.
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