摘要
利用太阳射电宽带频谱仪(0.7-7.6 GHz)于2001年10月19目观测到的复杂太阳射电大爆发,呈现出许多有趣的特征.结合NoRH(Nobevama Radio Heliograph)的高空间分辨率射电成像观测及TRACE(Transition Region and Coronal Explorer)在远紫外(EUV)波段的高空间分辨率成像观测资料,分析了该爆发的射电频谱特征和微波射电源的演化以及它们与复杂的EUV日冕环系统的关系.该爆发是一个双带大耀斑的射电表征.前一部分以宽带(从厘米到米波)爆发为主,机制是回旋同步辐射,所对应的是环足源的辐射;后一部分以窄带(分米到米波)分米波爆发为主,机制是等离子体辐射和回旋共振辐射的联合,对应的是环顶源的辐射.
A very complex solar radio burst was observed with the wide-band spectrometer of NAOC. Combining the data of NoRH (Nobeyama Radio Heliograph) and TRACE (Transition Region and Coronal Explorer), the relation between the spectral characters and the evolution of microwave sources as well as the complex EUV coronal loops is analyzed. The main result is that, the burst on 19 October 2001 is an indicator of a great two-ribbon flare consisted of two parts. The first one is characterized by microwave emission due to the gyro-synchrotron emission of loop-foot sources, and the second one is characterized by metric and decimetric emission due to a combination of plasma and gyro-resonance mechanisms of loop-top sources.
出处
《天文学报》
CSCD
北大核心
2004年第4期389-401,共13页
Acta Astronomica Sinica
基金
973项目(G2000078403)国家自然科学基金(10333030)资助
