米波射电毫秒级SPIKE-Ⅲ型爆发与日冕电子加速过程的研究  

RELATIONS BETWEEN SOLAR RADIO MILLISECOND SPIKE-TYPE Ⅲ BURSTS IN METRIC WAVES AND ACCELERATION PROCESSES OF CORONAL ELECTRONS

作　　者：马媛[1] 谢瑞祥[1] 郑向明[1] 汪敏[1] 黄光力[2,3] 

机构地区：[1]中国科学院云南天文台,昆明650011 [2]中国科学院紫金山天文台,南京210008 [3]中国科学院国家天文观测中心

出　　处：《天文学报》2000年第3期270-277,共8页Acta Astronomica Sinica

基　　金：国家自然科学基金! ( 1 983 3 0 50 )

摘　　要：综述云南天文台在太阳活动 2 2周峰年期间观测到的米波射电频谱资料 ,和在处理资料时发现的一些共生毫秒级Spike的Ⅲ型爆发 ,它们的不同形态揭示了Ⅲ型爆发和毫秒级Spike的发生关系 .通过两个典型事件的分析 ,根据Spike和Ⅲ型爆发出现的时序以及形态的连续和转换特性 ,证实了日冕电子加速区位于毫秒级Spike爆发和Ⅲ型爆发的源区之上 ,由观测指出Ⅲ型爆发对应的界面频率是位于 2 50MHz附近 ,并试图用等离子体假设定性地解释米波毫秒Spike Ⅲ型爆发的产生机制 .In this article the metric wave radio spectrographical data obtained at Yunnan Observatory during the 22nd solar cycle are analysed. Based on the data processing, the type Ⅲ bursts of some symbiotic millisecond spikes are found of which the different morphologies reveal the genetic relation between type Ⅲ bursts and millisecond spikes. Through the analyses of two typical events and according to the temporal sequence of the appearance of spikes and type Ⅲ bursts as well as the characteristics of continuity and change of morphologies, it is verified that the acceleration area of the coronal electrons is located over the source zone of the millisecond spike bursts and type Ⅲ bursts. Our observations show that the interface frequency of a pair of type Ⅲ bursts lies near 250 MHz. Finally, the authors attempt to explain qualitatively the generation mechanism of the metric wave millisecond spike type Ⅲ bursts by means of the plasma hypothesis.

关 键 词：太阳射电爆发 精细结构 电子加速 日冕 

分 类 号：P162.1[天文地球—天文学]