2008年日全食观测到的太阳闪耀线偏振光谱

Linear Polarization of Flash Spectrum Observed from a Total Solar Eclipse in 2008

在2008年8月1日发生在中国的日全食食既时,我们测量到了从502.8—528.5nm波段范围内的闪耀光谱的线偏振信号。我们发现了一大组光谱线(特别是那些由中性铁、中性铜还有碳分子产生的谱线)相对于连续谱拥有非常高的偏振度,而线偏振光谱比闪耀光谱本身呈现出更强的结构特征。根据观测结果,我们认为相干散射、散射几何还有其它的机制在产生如此高的偏振度中共同发挥了作用。这一观测将深化我们对太阳高层大气物理状态和物理过程的认识。

We measured linear polarization signals of the flash spectrum ranging from 502.5 nm to 528.5 nm after second contact of a total solar eclipse which occurred on 2008 August 1 in China.A large group of spectral lines （especially those lines produced by neutral iron,neutral copper,and as carbon molecules） are found with very high polarization degrees relative to the continuum polarization,and the linear polarization spectrum is more abundantly structured than the flash spectrum itself.According to the observational result,we conclude that coherent scattering and scattering geometry as well as other mechanisms may together play a very important role in producing the high polarization amplitudes.This will help us deepen our understanding of the physical conditions of the solar upper atmospheres and the physical processes occurring there.