摘要
微波组合Ⅲ型爆发是指由低频端的微波普通Ⅲ型爆发和同时出现在高频端的微波连续U型爆发构成的组合体 .微波连续U型爆发是单个微波U型爆发在同一磁环中的进一步演化的结果 ,它仍是Ⅲ型爆发的一个次型 ,因此整个微波组合Ⅲ型爆发也是Ⅲ爆发的一个次型 .微波组合Ⅲ型爆发的辐射源 (即高能电子束 )来自同一个加速区 ,只不过在与低日冕区的磁环相互作用中被分离成捕获电子和逃逸电子束 ,并有不同的运动轨迹 ,最终同时辐射产生高频端的微波连续U型爆发和低频端的微波普通Ⅲ型爆发 .微波组合Ⅲ型爆发的形成与低日冕区的磁环结构密切相关 ,因而它是微波段的特有现象 .
A microwave combined Ⅲ type burst observed by Beijing Astronomical Observatory (BAO) on April 15, 1998 has been studied and analysed in this paper. The microwave combined Ⅲ type bursts (CMⅢ) are the bursts which combined the normal microwave Ⅲ type bursts in the lower frequency band with the microwave continuous U type bursts appearing in the higher frequency band during the same period. The original radiating source of microwave combined type Ⅲ burst may be the same energetic electron stream coming from the same acceleration region. When they inject into the magnetic archs in the bottom of the corona, some parts of them may be trapped by the arches and the others may escape from the field. At the same time, their emissions are the continuous microwave U type bursts on the higher frequency band and the normal microwave Ⅲ type bursts on the lower frequency band, respectively. These two parts added together are the microwave combined type Ⅲ bursts. The microwave continuous U bursts represent the further evolution of the single microwave U bursts in the same magnetic arch, and they are also one kind of the type Ⅲ bursts. Therefore, the whole combined microwave Ⅲ type bursts are basically one sub type of the type Ⅲ bursts. Their formation is closely related to the magnetic arch with bottle configuration in the bottom of the corona and the microwave combined type Ⅲ bursts are a particular phenomenon in microwaves.
出处
《天文学报》
CSCD
北大核心
2000年第4期384-392,共9页
Acta Astronomica Sinica
基金
国家自然科学基金!( 1 9773 0 1 6
1 983 3 0 50
4 9990 4 51 )等项目
中国科学院重点项目的支持
关键词
太阳微波爆发
微波组合Ⅲ型爆发
磁镜
solar radio burst, microwave combined type Ⅲ burst, magnetic mirror
