Photospheric abundances of oxygen, neon, and argon derived from the XUV spectrum of an impulsive flare
Photospheric abundances of oxygen, neon, and argon derived from the XUV spectrum of an impulsive flare
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来自脉冲耀斑 XUV 光谱的氧、氖和氩的光球丰度
DOI：
10.1086/169341
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
K. Widing
中科院分区：
文献类型：
--
作者：
U. Feldman;K. Widing
O、Ne、Na、Mg、Ar 和 Ca 的相对元素丰度是通过对脉冲耀斑发出的 XUV 光谱的详细分析来确定的。从三个诊断线比率测量的电子密度为 2-3 x 10 至 12/cu cm。研究发现耀斑中的相对丰度与从光球物质获得或建议的值相似。脉冲耀斑中的 O/Mg、Ne/Mg 和 Ar/Mg 比率比平均日冕中通常观察到的值高约四倍。有人认为，光球层上方的电场可能是造成第一电离势（FIP）高的元素组和 FIP 低的元素组之间丰度数量级变化的原因。 18 参考文献
Relative elemental abundances of O, Ne, Na, Mg, Ar, and Ca are determined from detailed analysis of XUV spectra emitted by an impulsive flare. The electron density measured from three diagnostic line ratios is 2-3 x 10 to the 12th/cu cm. It was found that the relative abundances in the flare are similar to values obtained from or proposed for photospheric material. The ratios of O/Mg, Ne/Mg, and Ar/Mg are about four times higher in the impulsive flare than the values typically observed in the average corona. It is suggested that electric fields above the photosphere may be responsible for the order of magnitude variations between the abundances of the group of elements with high first ionization potentials (FIP) and the group with low FIP. 18 refs.