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arXiv 1209.2595astro-ph.SRphysics.space-ph
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太阳风粘性阻力能解释CME减速吗?

Can solar wind viscous drag account for CME deceleration?

Prasad Subramanian, Alejandro Lara, Andrea Borgazzi

摘要:

到目前为止,已经根据经验阻力系数$C_{\rm D} \sim 1$评估了作用于行星际介质中太阳日冕物质抛射(CME)的力,该系数量化了典型CME由于与环境太阳风相互作用而经历的气动阻力的作用。我们使用湍流太阳风中粘性的微物理处方来获得阻力系数$C_{\rm D}$的分析模型。这是第一次对日冕物质抛射所经历的气动阻力进行物理表征。我们使用这个物理动机的处方$C_{\rm D}$在一个简单的,一维模型CME传播,以获得速度分布和旅行时间,同意以及观察到的减速经历的快速CME。

英文摘要:

The forces acting on solar Coronal Mass Ejections (CMEs) in the interplanetary medium have been evaluated so far in terms of an empirical drag coefficient $C_{\rm D} \sim 1$ that quantifies the role of the aerodynamic drag experienced by a typical CME due to its interaction with the ambient solar wind. We use a microphysical prescription for viscosity in the turbulent solar wind to obtain an analytical model for the drag coefficient $C_{\rm D}$. This is the first physical characterization of the aerodynamic drag experienced by CMEs. We use this physically motivated prescription for $C_{\rm D}$ in a simple, 1D model for CME propagation to obtain velocity profiles and travel times that agree well with observations of deceleration experienced by fast CMEs.

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