微波Ⅲ型爆发的一些初步研究

Preliminary Research on the Microwave Type-Ⅲ Bursts

云南天文台“四波段（１．４２ＧＨｚ，２．１３ＧＨｚ，２．８４ＧＨｚ和４．２６ＧＨｚ）太阳射电高时间同步观测系统”在１９９０．１～１９９４．１期间，观测到５个具有短时标漂移结构的射电爆发事件，也就是微波Ⅲ型爆发。本文从中选取较典型的１９９１年３月１３日事件，对Ⅲ型爆发的时间轮廓（持续时间，衰减时间）作了分析，并与米波，分米波和微波段其它观测结果作了一些比较，以求对长厘米～短分米波段（微波低端）Ⅲ型爆发的时间轮廓的特征有一个初步的了解，最后对爆发的物理参数作了估计。

microwave type-Ⅲ bursts have been observed by using the solar radio synchronous observational system with high temporal resolution at 1.42GHz, 2.13GHz, 2.84GHz and 4.26GHz in Yunnan Observatory during January 1990 to January 1994. The characteristics (such as durations, frequency drift, associated phenomena) of them are introduced briefly. The time profiles of the event on March 13, 1991 is analyzed in detail. Finally, the conclusion and discussion are given, and the physical parameters of this event are estimated.