摘要
本文利用Nancay射电日象仪在5个频率上所获得的Ⅲ型爆发群的高时间分辨率和高灵敏度的总强度和圆偏振辐射及其源位置和大小的观测资料,采用Fourier变换频谱分析方法,对58个事件作了细致研究.研究进一步证实了在Ⅲ型爆发群中的确存在着周期性,绝大多数事件的周期性处于1秒到6秒之间,而且大部分事件还呈现出其置信度水平高于90%的多重周期性.尤其重要的是,我们分析出Ⅲ型爆发群可分为两个性质不同的类型:一类具有弱偏振,并在长至6秒的宽范围中呈现出周期性,而且具有较大尺度的爆发源;另一类则具有强偏振,且呈现出不长于2秒的短周期性,具有较小尺度的致密源.
In the present paper, used the observational data containing the total and circularly polarized radiation, the position and the size of bursts obtained at five frequencies with Nancay Radioheliograph having high time resolution and sensitivity, and adopted the Fourier trans-form method for the spectral analysis,. 58 events of type Ⅲ burst groups have been studied in detail. It is further confirmed that the periodicities really exist in the type Ⅲ burst groups. The overwhelming majority of the periodicities lie between 1 and 6 seconds. Many events exhibit multiple periodicities with a confidence level larger than 90%. Especially, it has been found from our analysis that the type Ⅲ burst groups can be divided into two distinct classes, one has weak polarization, exhibits periodicities in the wide range up to 6 seconds, and has a burst source with larger dimensions, the other has strong polarization, exhibits short periodicities not longer than 2 seconds, and has a compact source with smaller dimensions.
出处
《天文学报》
CSCD
北大核心
1991年第1期28-35,共8页
Acta Astronomica Sinica
关键词
太阳
射电
射电爆发
频谱分析
Solar radio radiation—Radio bursts—Spectral analysis
