从微波爆发的精细结构谱估算粒子能量及磁场位形

本文采用荷兰Ｄｗｉｎｇｌｏｏ射电天文台的多通道频谱仪（４－８ＧＨｚ）所观测到的一种典型的精细结构事例（ＴｙｐｅＨａｎｄ）来证实源区存在小尺度磁场结构以及电子的短时标加速过程．进一步根据实测和理论分析估算电子的平均速度大约为光速的十分之一，微磁流管直径大约为６００ｋｍ．以及在短时标（０．１ｓ）加速过程中电子能量密度的演化．由此可见，在射电精细结构的动态频谱中含有极其丰富的物理信息，对太阳耀斑机制的理解具有重要意义．

The Estimation of the Particle Energy and Magnetic Field from the Fines Structure of Microwave Bursts

A typical microwave burst with fine structures(type band) observed by the Dwingloo multi-channel spectrometer is proposed as the evidence of a magnetic tube with small scale and acceleration of electron beams with a short time scale at the source of the bursts.It is predicted from the observation and theory that the average velocity of non-thermal electrons is about 0.lc and the density is about 104cm-3.There is a micro-magnetic tube with a scale length of six hundred kilometers at the microwave source.There is also a quasi-periodic(about 20 ms) evolution of the beam energy and the spectrum.Hence,the information from fine structures of the spectrum of solar radio bursts is very important for understanding the mechanismof solar flares.