Solar abundances from X-ray flare observations
Solar abundances from X-ray flare observations
复制标题
X 射线耀斑观测中的太阳丰度
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
J. H. Parkinson
中科院分区：
文献类型：
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作者：
N. Veck;J. H. Parkinson
X 射线线和连续谱观测用于从氢或类氦离子线中推导出 Si、S、Ar 和 Ca 的绝对日冕丰度。对于 Si (7.7+0.2, -0.3) 和 Ca (6.5+0.1, -0.3)，测得的日冕值与光球值非常一致，但 S (6.9+0.1, -0.3) 的值大约是光球值的一半。日冕中 Ar 的丰度 (6.4+0.2, -0.3) 似乎也比预期低 2-3 倍。有人认为这些差异是由于双极效应和磁扩散效应造成的。
X-ray line and continuum observations are used to derive the absolute coronal abundances of Si, S, Ar, and Ca from lines of hydrogenor helium-like ions. For Si (7.7+0.2, -0.3) and Ca (6.5+0.1, -0.3) the measured coronal values are in good agreement with the photospheric values, but the value for S (6.9+0.1, -0.3) is approximately half of the photospheric value. The abundance of Ar (6.4+0.2, -0.3) also appears to be lower in the corona by a factor of 2-3 than would be expected. It is suggested that these differences are due to ambipolar and magnetic diffusion effects.