中文摘要：

太阳射电爆发的动态频谱观测是研究太阳活动的重要手段之一．基于对2015年8月27日蒙城太阳射电频谱仪（McSRS）所观测得到一个M2．9级太阳耀斑光变特征的分析，发现由于仪器电子学上的问题，传统定标方法给出的结果并不理想．利用日本野边山的射电偏振仪（NoRP）／射电日像仪（NoRH）以及地球静止轨道环境业务卫星（GOES）的观测数据，结合有关辐射机制可以对定标方法进行改进．和传统的定标方法相比，改进后的定标结果和NoRP／NoRH的观测结果显示出更好的相关性，更好地揭示了耀斑射电频谱的演化规律．

英文摘要：

Observations of solar radio bursts are one of the most important tools to study solar activities. Based on the analysis of the Mengcheng Solar Radio Spectrometer observations of an M2.9 class flare occurred on 2015 August 27, we find that the classical calibration method does not give satisfactory results, due to the influence of the electronic apparatuses of the instrument. By using the X-ray and radio data of Geostationary Operational Environmental Satellites （GOES）, and Nobeyama Radio Polarimeter （NoRP）/Nobeyama Radioheliograph （NoRH）, and combined with the relevant radiative mechanisms, the calibration method is improved. Compared to the classical method, the improved calibration method provides better results, which are consistent with the NoRP/NoRH observations and reveal the typical evolution of the radio spectrum for a flare.