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首页> 外文会议>SOHO-17 10 Years of SOHO and Beyond >IMPORTANCE OF ABSORPTION AND VOLUME BLOCKING FOR LINE INTENSITY DEPRESSION IN EUV FILAMENTS
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IMPORTANCE OF ABSORPTION AND VOLUME BLOCKING FOR LINE INTENSITY DEPRESSION IN EUV FILAMENTS

机译：吸收和体积阻塞对EUV纤维线强度降低的重要性

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摘要

The nature of the EUV filaments, seen as the large dark structures in the EUV coronal lines with wavelength between 504 and 912 A , can be explained by two processes: absorption by the hydrogen resonance continuum (Lyman continuum) and the volume blocking. For estimation of the relative contributions of those two processes it is necessary to know the optical thickness at hydrogen Lyman continuum (e.g. at its head), height above the surface and the geometrical thickness of the filament. Using a spectroscopic model based on those two processes for modelling of the intensity depression of the EUV coronal lines and modelling of the profiles of hydrogen spectral lines these quantities can be estimated. In this work we are fitting synthetic proonles (computed using the non- -LTE one-dimensional slab model) to proonles of the hydrogen Lyman lines, Lyman continuum and proonles of the Hα line observed on May, 5 2000 by SoHO and THEMIS, respectivelly. We compared results obtained for this EUV filament with results of diagnostics of another EUV filament observed on October, 15 2000. We found that in both EUV filaments the absorption dominates over the volume blocking only in the Hα-parts of the EUV filaments. In the EUV extensions the contribution of the absorption to the intensity depression of the EUV coronal lines is maximally 50% relative to the volume blocking.
机译：EUV灯丝的性质被视为EUV冠状线中波长在504和912 A之间的大型深色结构，可以通过两个过程来解释：氢共振连续体（莱曼连续体）的吸收和体积阻断。为了估计这两个过程的相对贡献，必须知道在氢莱曼连续体（例如在其头部）的光学厚度，表面上方的高度和灯丝的几何厚度。使用基于这两个过程的光谱模型对EUV冠状线的强度下降进行建模以及对氢谱线的轮廓进行建模，可以估算这些量。在这项工作中，我们将合成的质子（使用非LTE一维平板模型计算）拟合到氢气氢Lyman线，Lyman连续体和Hα线的质子，分别由SoHO和THEMIS于2000年5月5日观察到。我们将获得的该EUV灯丝的结果与2000年10月15日观察到的另一EUV灯丝的诊断结果进行了比较。我们发现，在这两个EUV灯丝中，吸收仅在EUV灯丝的Hα部分中占主导，而体积吸收受阻。在EUV扩展中，相对于体积阻塞，吸收对EUV冠状线强度降低的贡献最大为50％。

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