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The Temperature and Density Structure of an Hα Flaring Loop

机译:Hα扩口环的温度和密度结构

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摘要

We develop a simple method to deduce the temperature and density in the loop of a limb flare from the spectral observations of two lines, Hα and Ca ii 8542 Å. We first build a grid of homogeneous slab models with various temperature and density values and compute the emergent line intensities, and then find the relevant model that can match the observed intensities. This is an approximate method because there are several other factors which can influence the line intensities. We apply this method to the limb flare of 11 November 1998 and deduce the values of temperature and hydrogen number density at different spatial points in the flaring loop, as well as their temporal variations. The loop contains relatively high density and possibly the loop top is slightly hotter and more condensed than the legs of the loop at the flare maximum time. A favorable scenario to produce this result is that magnetic reconnection occurs above the loop, and the reconnection outflow may heat and condense the plasma near the loop top.
机译:我们开发了一种简单的方法,可以根据两条线Hα和Ca ii 8542Å的光谱观测结果推断出肢体耀斑回线中的温度和密度。我们首先构建具有不同温度和密度值的均质平板模型的网格,并计算出线强度,然后找到可以匹配观察到的强度的相关模型。这是一种近似方法,因为还有其他一些因素会影响线的强度。我们将此方法应用于1998年11月11日的肢体火炬,并推导出火炬环中不同空间点的温度和氢数密度值以及它们的时间变化。回路包含相对较高的密度,并且在火炬最大时间处,回路顶部的温度可能比回路的支脚稍微高一些,并且更冷凝。产生此结果的有利方案是在回路上方发生磁重连,并且重连流出可能会加热并冷凝靠近回路顶部的等离子体。

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  • 来源
    《Solar Physics》 |2002年第1期|125-135|共11页
  • 作者

    M.D. Ding; Y. Liu; P.F. Chen;

  • 作者单位

    Department of Astronomy Nanjing University;

    Department of Astronomy Nanjing University;

    Department of Astronomy Nanjing University;

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  • 正文语种 eng
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