一个宽带的太阳射电尖峰事件

A Rare Broad Band Solar Radio Spike Event

根据不同的发射波模以及偏振态（偏振度与偏振方向）的快速时变特征，对1993年10月2日07：44：34-07：44：52：99UT期间的太阳射电事件进行了证认，认为这是一个由两群、总数约为40个尖峰（spike）结构组成的罕见的宽带事件，它的总带宽＞300MHz、相对带宽■5％．根据它们在2．545GHZ，2．645GHZ；2．695GHZ和2B40GHZ上的流量资料，首次对一些spike结构作了谱分析．发现spike结构谱的峰值频率，第一群呈现为随时间由高频向低频漂移的倾向，第二群基本上位于2．695GHZ上．Spike谱的这些观测特征，可定性地用非热电子束流平均能量的时变特性来解释．对于第二群具有相同峰值频率的spike辐射，可能来自同一电子回旋脉泽不稳定区域．

We have analyzed the solar radio event of 1993-10-02, 074434-074452UT both with regard to spectrum and time variation of polarization. We found it to be a rare broad band spike event consisting of two groups of 40 spike structures with a total bandwidth > 300MHz and relative bandwidth < 5%. nom their flux densities at 2.545, 2.645, 2.695 and 2.840 GHz, it is found that the peak frequency drifted from high to low frequencies for the first group and remained at almost at the same frequency of 2.695 GHz for the second group. The frequency drift probably means variation of average energy of the nonthermal electron beam with time, while the constani peak frequency probably means emission from the same region of electron cyclotron maser instability.