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首页> 外文会议>COSPAR colloquium >COMBINING SXT AND CDS OBSERVATIONS TO INVESTIGATE CORONAL ABUNDANCES
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COMBINING SXT AND CDS OBSERVATIONS TO INVESTIGATE CORONAL ABUNDANCES

机译：结合SXT和CDS观察调查冠状丰富

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It has been shown that elemental abundances vary up to a factor of about four from the photosphere to the corona and that this variation is based on the first ionization potential of each element (Fludra et al., 1999). Also, these abundances can vary greatly from feature to feature in the corona and can vary within a coronal structure such as a streamer or loop. Accurate knowledge of the elemental abundances is vital for characterizing solar corona plasma and observing how elemental abundances vary may provide insight into the underlying mechanisms causing the variation. There has not yet been a satisfactory theory as to the causes of these abundance variations that can be constrained by observations and none predict variations to occur within the corona (Fludra, et al. 1999). There are currently three different empirical models describing the average coronal elemental abundance (Fludra & Schmelz 1999) and these are averages over whole sun and do not take into account variations between coronal features. In order to study the abundances of a coronal loop, observations by the Yohkoh soft x-ray telescope (SXT) and the SOHO coronal diagnostic spectrometer (CDS) were combined using a multi-thermal differential emission measure (DEM) technique. This method of combining SXT broadband data with spectral data has proven to be very beneficial in the characterization of corona plasma parameters (Schmelz et al. 2001). A preliminary analysis of this loop suggests not only that the abundances values may differ from the Meyer (1985) values, which are used as the input for standard SXT flux calculations, but also that there may also be a variation of elemental abundances along the coronal loop structure.
机译：它已经显示，元素丰度从光球到电晕变化到约四倍且该变化基于每个元件的第一电离电势（Fludra等人，1999）。此外，这些丰度可以从特性极大地变化到功能在电晕并且可以在冠状结构内，诸如拖缆或循环变化。的元素丰度的准确的知识是用于表征太阳能电晕等离子体，并观察元素丰度如何变化可以提供深入了解造成的变化的基本机制是至关重要的。存在尚未令人满意的理论，以能够由观察的制约和电晕（Fludra，等人，1999）中发生无预测变化这些丰度变化的原因。目前描述的平均冠状元素丰度三种不同的实证模型（Fludra和施梅尔茨1999年），这些都是在整个太阳平均值，没有考虑到冠特征之间有所差异。为了研究冠状循环的丰度，通过YOHKOH软x射线望远镜（SXT）和SOHO冠状诊断分光计（CDS）的观察使用多差热发射量度（DEM）技术合并。 SXT宽带数据与光谱数据相结合的该方法已被证明是在电晕等离子体参数的表征是非常有益的（施梅尔茨等人，2001）。这个循环的初步分析表明不仅丰度值可从迈耶不同（1985）值，其被用作输入标准SXT通量的计算，但也有可能也有元素丰度的沿冠状的变化循环结构。

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