毫秒时间尺度太阳微波辐射新特征

Some Features of Solar Microwave Emissions of Millisecond Time Scale

自1990年6月北京天文台太阳射电偏振仪投入实测以来,观测到一百多个“Spike”和短时标精细结构微波幅射,其中包括一些新的微波幅射特征。本文给出了主要的四点特征:(1)窄带辐射;(2)快速偏振逆转;(3)快速频率漂移;(4)不同时标的准周期振荡。

In June 1990, a new microwave polarimeter was put into operation at Beijing Astronomical Observatory. The polarimeter receives right and left hand circular polarizations at 2545 and 2645 frequencies, signal from each of the four channels can be sampled in every 0.2ms or 2ms.Since July, 1990 over one hundred 'spike' and fine structure events have been recorded. Some interesting features are demonstrated in this paper.