Relations between solar radio millisecond spike-type III bursts in metric waves and acceleration processes of coronal electrons

• Published in: Chinese astronomy and astrophysics 2001, Vol.25 (1), p.111-119
• Main Authors: Yuan, Ma, Rui-xiang, Xie, Xiang-ming, Zheng, Min, Wang, Guang-li, Huang
• Format: Article
• Language: English
• Subjects: solar radio burst—fine structures—electron acceleration
• ISSN: 0275-1062; 1879-128X
• DOI: 10.1016/S0275-1062(01)00050-9

This paper presents a comprehensive account of the data obtained with the metric wave radio spectrograph of Yunnan Observatory during the maximum of 22nd solar activity cycle and some type III bursts of symbiotic millisecond class spikes discovered in the data reduction. The various morphologies reveal the relation between the occurrences of type III bursts and millisecond spikes. From an analysis of two typical events according to the time sequence of appearances of spikes and type III bursts as well as the characteristics of continuity and transformation in morphology, it is verified that the region of acceleration of coronal electrons is located above the sources of millisecond spikes and type III bursts. The authors' observations show that the interface frequency corresponding to type III bursts lies near 250 MHz. Finally, the authors attempt to interpret qualitatively the generation mechanism of the metric wave millisecond spike-type III bursts with the plasma hypothesis.