Hinode/EIS中新的EUV Fe IX发射谱线的鉴定
New EUV Fe IX emission line identifications from Hinode/EIS
摘要：
首次在Hinode卫星上的EUV成像光谱仪的光谱中识别出波长范围为188- 198 A的四个Fe IX跃迁。特别是在197.86 A处的发射谱线是未混合的并且接近EIS灵敏度曲线的峰值，使得其成为在约800，000 K - a临界温度处的等离子体的有价值的诊断，用于研究电晕和过渡区之间的界面。从CHIANTI数据库中预测的四条线之间的理论比率显示对密度和温度的敏感性较弱，观测值与理论一致。197.86相对于171.07的Fe IX的共振线的比率被认为是一个很好的温度诊断，独立于密度，和导出的温度在分析的数据集是log T=5.95，接近预测的最大电离的Fe IX的温度。
英文摘要：
Four Fe IX transitions in the wavelength range 188--198 A are identified for the first time in spectra from the EUV Imaging Spectrometer on board the Hinode satellite. In particular the emission line at 197.86 A is unblended and close to the peak of the EIS sensitivity curve, making it a valuable diagnostic of plasma at around 800,000 K - a critical temperature for studying the interface between the corona and transition region. Theoretical ratios amongst the four lines predicted from the CHIANTI database reveal weak sensitivity to density and temperature with observed values consistent with theory. The ratio of 197.86 relative to the 171.07 resonance line of Fe IX is found to be an excellent temperature diagnostic, independent of density, and the derived temperature in the analysed data set is log T=5.95, close to the predicted temperature of maximum ionization of Fe IX.
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