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Interpretation of Localized Deficits in Coronal Emission

机译：冠状动脉发射中局部缺陷的解释

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摘要

Coronal images recorded above the limb in Fe xiv (530.3 nm) and Fe x (637.5 nm) sometimes have localized regions of anomalously low emission, with the appearance of an abrupt gap in the background corona. These ‘dark spaces’ have been previously described in the literature in the case of the 530.3 nm line and tentatively explained by reduced coronal plasma density and/or a decrease in the line intensity due to temperatures above or below the optimal ionization temperature for Fe xiv. However, loops are sometimes observed spanning gaps, with diminished loop brightness over the region of the gap. It is concluded that at least some of these regions of reduced brightness are caused by absorption of the coronal emission. An analysis reveals that absorption by coronal ions is inadequate as a mechanism to explain the phenomenon. Absorption by neutral hydrogen is, however, consistent with the observations in terms of the reduced brightness of the gaps. The concentration of cool material in the coronal environment associated with large magnetic fields on the disk could explain the gaps. Hence, neutral hydrogen continuum absorption appears to provide a plausible interpretation of, at least, some coronal gaps. Based on this result and from measured intensities, the electron density in the region of a gap is derived and found to be consistent with estimates derived elsewhere.
机译：在Fe xiv（530.3 nm）和Fe x（637.5 nm）中在肢体上方记录的冠状图像有时具有异常低发射的局部区域，在背景电晕中出现突然的间隙。这些“暗空间”先前已在文献中针对530.3 nm线进行了描述，并尝试通过降低冠状等离子体密度和/或由于温度高于或低于Fe xiv的最佳电离温度而降低线强度来进行解释。 。但是，有时会在间隙之间观察到回路，在间隙区域上回路亮度降低。结论是这些亮度降低的区域中的至少一些是由日冕发射的吸收引起的。分析表明，冠状离子的吸收不足以解释该现象。然而，就间隙亮度的降低而言，中性氢的吸收与观察结果一致。与磁盘上大磁场相关联的冠状环境中冷物质的浓度可以解释这些间隙。因此，中性氢连续吸收似乎为至少一些冠状间隙提供了合理的解释。根据该结果和所测得的强度，可以得出间隙区域中的电子密度，并与其他地方得出的估计值一致。

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  • 来源
    《Solar Physics》 |2002年第1期|63-71|共9页
  • 作者

    Z. Zhang; R.N. Smartt; D.A. Landman;

  • 作者单位

    Department of Astronomy Nanjing University;

    National Solar Observatory/Sacramento Peak;

    Mission Research Corporation;

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