太阳分米波尖峰辐射最小带宽的探讨  

An Approach to the Minimum Bandwidth of the Solar Decimetric Spikes

作　　者：汪敏[1] 王昆山 许春[1] 施硕彪[1] 李维华[1] 

机构地区：[1]中国科学院国家天文台云南天文台,云南昆明650011 [2]云南省计算中心,云南昆明650023

出　　处：《云南天文台台刊》2003年第2期29-35,共7页Publications of the Yunnan Observatoty

基　　金：国家自然科学基金资助项目(19833050和19973016);973资助项目(G2000078403).

摘　　要：云南天文台0.6～1.5GHz太阳射电快速动态频谱仪,在2001年6月24日的射电爆发中观测到大量尖峰。由于观测仪器有相当高的频率分辨率,使我们可以对尖峰的绝对带宽进行更精细的统计分析。由于尖峰数量很大,特别编制了识别尖峰并测量其带宽的软件来进行统计工作。结果发现76%的尖峰的绝对带宽达到仪器频率分辨率1.4MHz,其相对带宽达到0.1%。这比以前关于尖峰辐射带宽的统计结果要小很多。统计结果支持用ECM机制解释尖峰辐射。Thousands of spikes were observed with very high spectral resolution by the 0.6-1.5GHz spectrometer of Yunnan Observatory on Jume 24,2001.The special software is designed to distinguish the spikes and measure the relevant parameters.The distributions of the absolute bandwidth of these spikes are statistically analyzed in detail.76% of the total spikes have the absolute bandwidth of 1.4MHz (the spectral resolution of the instrument),hence the relative bandwidth is down to 0.1%. This result suggests that the most spikes are due to the electron cyclotron maser mechanism (ECM).

关 键 词：太阳射电爆发 尖峰辐射 最小带宽 辐射机制 太阳分米波 

分 类 号：P163[天文地球—天文学]