2．6～3．8GHz长寿命微波Ⅲ型爆发统计特性

Statistic Property of Long Duration Microwave Type Ⅲ Bursts at 2.6～3.8GHz

通过对2．6～3．8GHz射电频谱仪观测数据的检索。挑选出73个孤立的特征寿命为20s的Ⅲ型爆发进行统计分析。得到了太阳射电Ⅲ型爆发在2600—3800MHz间的辐射寿命的统计分布；并用相应的数据检验了在米波和分米波辐射存在的经验关系，结果显示在2．6-3．8GHz的射电波段上，Ⅲ型爆发的寿命和频率之间仍然成反比的关系，但是系数不同于米波和分米波对应的系数。

Through a systematical survey of the data in 2.6 - 3.8 GHz from the Radio Spectrometer in Beijing, 73 isolated microwave type Ⅲ solar radio bursts with characteristic life time of 20 s are selected. The frequency distribution of their full width at half maximum （FWHM） is acquired. The examination of the empirical law in the metric and decimetric wavelengths is made using the observed data and result shows that the life time of the type Ⅲ bursts at 2.6 - 3.8 GHz is inverse propertional to their frequency, but the corresponding factors are very different compared with those of meter wave and decimeter wave.