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Transport in the interplanetary medium of coronal mass ejections

机译:日冕物质抛射在行星际介质中的运输

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摘要

Coronal mass ejections (CMEs) are large scale structures of plasma and magnetic field expelled from the Sun to the interplanetary medium and generally observed in white light coronagraphs. During their travel, in the interplanetary medium these structures named interplanetary coronal mass ejections (ICMEs), suffer acceleration or deceleration due to the interaction with the ambient solar wind. This process can be understood as a transference of momentum between the interplanetary CME (ICME) and the solar wind. This process seems to be fundamentally different for 'slow' and 'fast' ICMEs (compared with the ambient solar wind velocity).rnIn this work, we approach the problem from the fluid dynamics point of view and consider the ICMEs - solar wind system as two interacting fluids under the action of viscous forces. We note that this interaction is a special case of interaction between low density plasmas. Using these viscous forces in the Newtons Second Law, we obtained an analytical solution for the ICME velocity as a function of time. By comparing our analytic results with empirical models found in recent literature, we suggested values for the viscosity and drag parameters in this system. In this first approximation we have neglected the magnetic field.
机译:日冕物质抛射(CME)是从太阳向行星际介质排出的等离子体和磁场的大规模结构,通常在白光日冕仪中观察到。在它们的行进过程中,在行星际介质中,这些结构被称为行星际日冕质量抛射(ICME),由于与周围太阳风的相互作用而遭受加速或减速。这个过程可以理解为在行星际CME(ICME)和太阳风之间的动量转移。对于“慢”和“快”的ICME(与周围的太阳风速相比),此过程似乎根本不同。在这项工作中,我们从流体动力学的角度解决问题,并将ICME –太阳风系统视为在粘性力的作用下两种相互作用的流体。我们注意到这种相互作用是低密度等离子体之间相互作用的特例。利用牛顿第二定律中的这些粘性力,我们获得了ICME速度随时间变化的解析解。通过将我们的分析结果与最近文献中的经验模型进行比较,我们建议了该系统中粘度和阻力参数的值。在第一近似中,我们忽略了磁场。

著录项

  • 来源
    《Geofisica internacional》 |2008年第3期|301-310|共10页
  • 作者单位

    Divisdo de Geofisica Espacial, Institute Nacional de Pesquisas Espaciais, Sao Jose dos Campos, Sao Paulo, Brazil;

    Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico;

    Facultad de Ciencias, Universidad Autonoma del Estado de Mexico, Mexico;

    Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico Facultad de Ciencias, Universidad Autonoma del Estado de Mexico, Mexico;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    coronal mass ejections; space weather; ICME travel time;

    机译:冠状物质抛射;空间天气;ICME旅行时间;

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