短分米波段上的长周期脉动现象

Long-Period Pulsations at Short Dm Wavelength

在１９９０年７月３０日观测到的太阳射电大爆发中，在１４２０ＭＨｚ和２０００ＭＨｚ两个波段上发现了长周期（数＋秒）的脉冲现象。经数据处理分析，发现了几个特点：（１）脉冲的宽带大于６００ＭＨｚ。（２）１４２０ＭＨｚ上的脉动的周期较２０００ＭＨｚ上脉动的周期大，相对强度也是前者较大。（３）脉冲的相对强度随脉冲周期的增大而增大。

A great solar radio burst was observated at Yunnan Observatory on July 30,1990.In this burst,the long periodic(several tens of second)pulsatons were found at 1420MHz and 2000MHz.It is found that: 1 The bandwidth of the pulsations is larger than 600MHz. 2 The periods of the pulses at 1420MHz are larger than ones at 2000MHz. 3 The period of the pulse rises when the relative amplitude increases, and theyave an approximately linear relationship.