太阳耀斑硬X射线高能时延和辐射展宽

HIGH ENERGY DELAY AND EMISSION BROADENING OF HARD X-RAYS IN SOLAR FLARES

本文从耀斑高能电子束流与太阳大气相互作用产生硬X射线辐射的基本事实出发，根据观测资料，提出了一个流量与能谱同步变化的注入源函数模型，研究太阳大气（靶物质）密度对耀斑硬X射线时间响应．理论计算与观测事实基本一致．主要计算结果如下：高能时延与辐射展宽是耀斑硬X射线轫致辐射时间特征的二种表现，硬X射线发射区的太阳大气密度越低，高能时延与辐射展宽效应越明显，二者之间存在显著的相关性．

From the well-known fact that the solar hard X-rays are produced by an energetic electron beam impinging on solar atmosphere, and based on the observational fact that there are good correlation between the solar hard X-ray flux and energy spectrum, in this paper, a source function with synchronous variation between the injecting electron beam flux and spectrum index is proposed, and some calculating results about hard X-ray temporal properties in solar flares are obtained. These results show: high energy delay and emission broadening are two manifestations of solar hard X-ray temporal properties in the nonthermal bremsstrahlung process, and the relation between them is very dominant. The lower the density of solar atmosphere where hard X-rays produced, the more distinct for high energy delay and emission broadening of solar hard X-rays.