摘要
详细介绍了北京天文台 2 .6— 3 .8GHz太阳射电频谱仪在 1 998年 4月 1 5日观测到的一群微波Ⅲ型爆发 .它们具有宽频带 (>1 0 0MHz)、短时标 (<1 0 0ms)、高偏振 (1 0 0 % )、短周期脉动 (百毫秒 )、内向快速频率漂移 (高于 1GHz/s)等显著特征 .讨论了它的观测特征、时间轮廓和脉动现象 ,认为该群微波Ⅲ型爆发起源于等离子体基波辐射 .
A group of microwave type Ⅲ bursts observed by the 2.6 3.8 GHz spectrometer of Beijing Astronomical Observatory(BAO) on 1998 April 15 is introduced in detail in this paper. They have the characteristics of broad bandwidth (>100MHz), short durations (<100ms), very high polarization degrees (～100%), positive frequency drift rates (>1 GHz/s), and fast pulsations (with a period of about 100 ms). Their time profiles are also analyzed. According to these characteristics, we suggest that these microwave type Ⅲ bursts are due to the plasma fundamental emission.
出处
《天文学报》
CSCD
北大核心
2001年第4期382-389,共8页
Acta Astronomica Sinica
基金
国家自然基金 (No.1 983 3 0 5 0和No .1 9973 0 1 6)资助
