位于日冕微波区的微波III型爆发界面频率的发现

A Separatrix Frequency of Microwave Type III Burst Found in Microwave Range in Corona

在北京天文台１．０－２．０ＧＨｚ射电频谱仪记录到的１９９４年１月５日爆发图上，首次发现一界面频率位于１２４０ＭＨｚ与１３４０ＭＨｚ之间的微波ＩＩ型爆发对，其频漂率为－０．２２ＧＨｚ／ｓ和＋０．２３ＧＨｚ／ｓ．由此推出电子加速区位于光球之上３．７×１０４ｋｍ的高度，电子加速区及ＩＩ型爆发形成区的高度范围约为１０００公里，而电子束的速度相应为０．１０２ｃ及０．１０６ｃ．

Using the 1.0-2.0 GHz radiospectrograph of Beijing Astronomical Observatory, a microwave type III burst pair characterized by two branches with frequency drift rate of-0.22 GHz/s and +0.23 GHz/s respectively, and separatrix frequency between 1240 MHz and 1340 MHz, superimposed on the microwave burst of January 5, 1994,was found for first time. These are deduced that the height of the electron acceleration region of this event is at 3.7×10 4 km above photosphere and the height range of the electron acceleration region, as well as the forming region of type III burst is about 1000 km, and the electron beams' speeds are 0.102c and 0.106c, respectively.