论文标题
FUV和EUV中用于诊断冠状磁场的光谱线
Spectral lines in FUV and EUV for diagnosing coronal magnetic field
论文作者
论文摘要
远离紫外线（FUV）和极端紫外线（EUV）波长范围的光谱线的诊断能力是根据其Hanle和Zeeman敏感性对太阳能电晕中探测矢量磁场的敏感性探索的。覆盖的温度范围是log $ _ {10}（t）= 5.5-6.3 $。由于纵向zeeman效应引起的圆极化信号估计在500至1600Å的波长范围内的光谱线。发现FUV线的Stokes $ v/i $信号的纵向场强度为10 $^{ - 4} $的顺序为10 Gauss的纵向强度，这进一步降低至1200Å以下波长的10 $^{ - 5} $。由于信号如此低，本研究的目的是找到具有不同汉尔灵敏度的光谱线的组合，但峰形成温度相同，以探测冠状动脉磁场载体。 Hanle敏感线的组合更适合，因为与Zeeman信号相比，Hanle信号至少要大量数量级更强。至少需要两种光谱线引起的hanle效应引起的线性极化信号需要在整个矢量上获取信息。从这项研究中可以发现，对于给定的温度范围，总是有一对汉尔敏感线，适合于探测冠状动物磁场，并且它们在其波长方面彼此近距离接近。
The diagnostic capabilities of spectral lines in far ultraviolet (FUV) and extreme ultraviolet (EUV) wavelength range are explored in terms of their Hanle and Zeeman sensitivity to probe vector magnetic field in the solar corona. The temperature range covered is log$_{10}(T)=5.5-6.3$. The circular polarization signal due to longitudinal Zeeman effect is estimated for spectral lines in the wavelength range of 500 to 1600 Å. The Stokes $V/I$ signal for a FUV line is found to be in the order of 10$^{-4}$ for a longitudinal field strength of 10 Gauss, which further reduces to 10$^{-5}$ for wavelengths below 1200 Å. Due to such low signals, the present study aims to find combination of spectral lines having different Hanle sensitivity but with identical peak formation temperature to probe coronal magnetic field vector. The combination of Hanle sensitive lines is better suited because the Hanle signals are stronger by at least an order of magnitude compared to Zeeman signals. The linear polarization signals due to Hanle effect from at least two spectral lines are required to derive information on the full vector. It is found from this study that there is always a pair of Hanle sensitive lines for a given temperature range suitable for probing coronal vector magnetic field and they are located in close proximity with each other in terms of their wavelength.
