1974年10月11日白光耀斑的光谱分析

SPECTRAL ANALYSIS OF THE WHITE LIGHT FLARE ON 11 OCTOBER 1974

１９７４年１０月１１日耀斑的光谱分析表明，连续发射和微波爆发几乎同时达到极大。在连续辐射极大时刻出现了高项巴耳末发射线和微弱的巴耳末跳跃，所有这些说明这个耀斑是Ⅰ型白光耀斑。我们发现，在这个耀斑连续发射的极大时刻，ＣａＩＩＫ线的Ｋ＿１．处强度大大增强，约达到连续辐射强度的一半，对应的辐射温度达到５７１６Ｋ。这个反常增强的持续时间小于４分钟。现有的半经验模型似不能给出这样的结果。色球压缩区也不能给出解释。

The spectral analysis of the 1974 Oct. 11 flare indicates that the continuum emission and the microwave burst peaked nearly at the same time. The high Balmer lines and a weak Balmer jump appeared at the continuum peak time. All these imply that the flare can be classified as a Type I WLF. It was found that at the continuum peak time, the intensity of K1 in the CaII K line increased much and reached nearly half of the continuum intensity, which corresponds to a radiative temperature of 5716K! The duration of this unusual increase is less than 4 min.It seems that neither existing semi-empirical models nor the chromospheric condensation can reproduce this characteristic.