日冕加速区附近射电尖峰辐射的小尺度结构

Small-Scale Structure of Millisecond Emission Near Coronal Acceleration Sites

太阳射电尖峰辐射(spike)的窄频带是一个具有特征性的参数,不但可从它计算出Spike辐射源区的小尺度结构,而且观测结果与Spike辐射理论可相互验证.我们利用云南天文台0.5 MHz频率分辨率的射电频谱观测资料,作出了230—300MHz频段上单个Spike带宽分布,并由此给出一群Spike源区的最可几尺度为151km,最大源区尺度为830km.

The narrow bandwidth of a solar radio spike is a characteristic parameter. Using this spike bandwidth not only the small-scale structure of spike source dimension can be calculated but also the theory of spike emission can be checked with the observations. Using the observational data with a frequency resolution of 0.5 MHz obtained at Yunnan Observatory, we got a bandwidth distribution of spikes in a frequency range from 230 MHz to 300 MHz, and derived the possible dimension of spike sources to be 151km and the upper limitation to be 830 km.