太阳微波M型爆发  

A Microwave M-Type Burst

作　　者：宁宗军[1] 傅其骏[1] 陆全康[2] 

机构地区：[1]中国科学院北京天文台,北京100012 [2]复旦大学物理系,上海200433

出　　处：《天体物理学报》2000年第2期203-208,共6页

基　　金：国家自然科学基金

摘　　要：分析北京天文台１９９８年４月１５日观测到的一个太阳微波Ｍ型爆发事件．Ｍ型爆发实质上是Ⅲ型爆发的一个次型，它由两个连续的Ｕ型爆发所组成，即爆发源在同一个磁环中由于磁镜的作用而连续往返运动后的轨迹，但是在低时间分辨率（０．２ｓ）记录资料中却是 Ｕ型爆发的形态．因此高时间分辨率（８ ｍｓ）的记录资料能更准确地反映Ｍ型爆发源的真实运动情况．对比组成Ｍ型爆发的两个Ｕ型爆发，可以看到，该磁环很可能处在下降的演化阶段．最后讨论该磁环可能的空间分布．A microwave M-type burst observed by Beijing Astronomical observatory on 1998 April 15 is studied and analysed in this paper. It is composed of two continuous inverted U-type bursts, the sources moving to and fro within one magnetic arch from reflection by the magnetic mirror around one footpoint of the same magnetic arch. At a low time resolution (0.2s) the records show the U-type morphology while the true motion is revealed by the high time resolution (8ms) records. By comparing the two constituent U-type bursts, we see that the magnetic arch is probably at the descending phase of evolution. Its possible configuration in space is discussed.

关 键 词：太阳射电 M型爆发 磁环 磁镜 微波爆发 

分 类 号：P182.2[天文地球—天文学]