从硬X射线和微波爆发频谱推断的两种太阳耀斑高能电子谱指数的异同  

THE RELATION BETWEEN THE ENERGY SPECTRAL INDEX OF X-RAY-PRODUCING ELECTRONS AND THAT OF RADIO-PRODUCING ELECTRONS

作　　者：姚金兴[1] 于兴凤[1] 

机构地区：[1]中国科学院紫金山天文台,南京210008

出　　处：《天文学报》1998年第4期398-404,共7页Acta Astronomica Sinica

基　　金：自然科学基金!19473020;49391400;江苏省基金!BK97207

摘　　要：从观测频谱资料出发表明谱极大两边的能谱指数在不同的模型中有不同的结果．在均匀的射电源模型下，光厚边的谱指数几乎与电子能谱指数无关；而从光薄边的谱指数得到的电子能谱指数δR远小于X射线的δX.因此均匀源模型下两者的能谱指数是不同的．在使用非均匀源模型时，无论是从光厚边还是从光薄边的潜指数，得到的电子能谱指数都是等同于X射线的，即δR=δX.这从能谱指数的角度上，从实测资料论证了两者的非热电子分布可以是同样的．并以1981年4月27日0800UT的爆发为例，计算了非均匀射电源的参数。表征磁场梯度的αB值为2．0-4.5，源中的最大磁场为207—440G，3GHz的射电源的球壳大小为（0．9-4．6）×109cm．It is argued in mis paper whether the energy spectral indices of X--ray--producing and radio-producing electrons are the same. It is shown that mis is model--dependent.In homogeneous radio sources, the electron energy spectral index derived from the spectral index of optically thick microwave emission is negative and unreasonable; and that derived on the optically thin side is far smaller than the δx obtained from the hard X--ray bursts. Therefore, the two electron spectral indices are different in the model of a homogeneous radio source. In the nonhomogeneous radio sources, the electron energy spectral indices δR. derived for the optically thin and thick sides are both equal to δx This has verified from the view point of the energy spectral index and observational data that the X--ray--producing and radio--producing electrons may have a common population.

关 键 词：太阳微波暴 硬X射线暴 高能电子 能谱指数 

分 类 号：P182.52[天文地球—天文学] P163