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Plasma and Magnetic Field Inside Magnetic Clouds: a Global Study

机译:电磁云内部的等离子体和磁场:全球研究

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摘要

Data observed during spacecraft encounters with magnetic clouds have been extensively analyzed in the literature. Moreover, several models have been proposed for the magnetic topology of these events, and fitted to the observations. Although these interplanetary events present well-defined plasma features, none of those models have included a simultaneous analysis of magnetic field and plasma data. Using as a starting point a non-force-free model that we have developed previously, we present a global study of MCs that include both the magnetic field topology and the plasma pressure. In this paper we obtain the governing equations for both magnitudes inside a MC. The expressions deduced are fitted simultaneously to the measurements of plasma pressure and magnetic field vector. We perform an analysis of magnetic field and plasma WIND observations within several MCs from 1995 to 1998. The analysis is confined to four of these events that have high-quality data. Only in one fitting procedure we obtain the orientation of the magnetic cloud relative to the ecliptic plane and the current density of the plasma inside the cloud. We find that the equations proposed reproduce the experimental data quite well.
机译:文献中已对航天器与磁性云相遇期间观察到的数据进行了广泛分析。此外,针对这些事件的磁拓扑已经提出了几种模型,并适合于观测。尽管这些行星际事件具有明确定义的等离子体特征,但是这些模型均未包含对磁场和等离子体数据的同步分析。使用我们先前开发的非无力模型作为起点,我们提出了对MC的整体研究,其中包括磁场拓扑和等离子压力。在本文中,我们获得了MC内部两个量级的控制方程。推导的表达式同时适用于血浆压力和磁场矢量的测量。我们对1995年至1998年几个MC内的磁场和等离子体WIND观测资料进行了分析。分析仅限于其中四个具有高质量数据的事件。只有在一种拟合过程中,我们才能获得磁云相对于黄道面的方向以及云内部等离子体的电流密度。我们发现提出的方程很好地再现了实验数据。

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  • 来源
    《Solar Physics》 |2002年第1期|187-198|共12页
  • 作者单位

    Departamento de Física Universidad de Alcalá Alcalá de Henares;

    Departamento de Física Universidad de Alcalá Alcalá de Henares;

    Departamento de Física Universidad de Alcalá Alcalá de Henares;

    Departamento de Física Universidad de Alcalá Alcalá de Henares;

    Laboratory for Extraterrestrial Physics NASA Goddard Space Flight Center;

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  • 正文语种 eng
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