摘要
本文介绍一组短分米波（1．42GHz）太阳微耀斑的射电和光学辐射特征，它们包含53个叠加在连续辐射背景上的射电快速精细结构（FFS），即准周期快速脉冲链（称微耀斑），它们的形态相似，强度大约在150－200sfu范围内，其寿命（半功率宽）大多为15－50ms，有18个分离的双峰结构，该事件产生的7646活动区中出现两处新浮现的几个小黑子，呈现复杂极性，可能存在多重交叉小磁流环多次重联的复杂状况．本文定性地讨论了其产生机制，支持电流环爆炸性聚合模型的理论。
In this paper, the radio and optical properties of a group of short decimeter wave (1.42 MHz) solar microflares are presented. The event consists of 53 radio fast fine structure (FFS) in a quasi-periodic pulsation train superimposed on the radio continuum emission.Their profiles are all similar except 18 which have double peak structure. They are all with a strength of 150-200 sfu and a duration (half power width) of the order of 15-2oms.This event takes place in the active region 7646 where two newly emerging groups of small sunspots with complex polarities and multiple reconnection of multiplex cross magnetic loops may occur. We discuss qualitatively the mechanism of the occurrence in this paper and give support to the theoretical model of current loop explosive coalescence.
基金
国家自然科学基金
关键词
耀斑
太阳
射电爆发
太阳黑子
磁场
Sun microflare radio burst ms spikes sunspots magnetic field
