1974年10月11日白光耀斑的光谱分析

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Ｋ１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

SPECTRAL ANALYSIS OF THE WHITE LIGHT FLARE ON 11 OCTOBER 1974

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.