Synthesising solar radio images from Atmospheric Imaging Assembly extreme-ultraviolet data

• 作者: Ming-De Ding Song-Hua Hu Xin Cheng Zhuo-Fei Li
• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2020,（2）
• 页码范围: 23-30
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-4527/20/2/18

摘要

During non-flaring times,the radio flux of the Sun at wavelengths of a few centimeters to several tens of centimeters mostly originates from thermal bremsstrahlung emission,very similar to extremeultraviolet (EUV) radiation.Owing to such a proximity,it is feasible to investigate the relationship between the EUV emission and radio emission in a quantitative way.In this paper,we reconstruct the radio images of the Sun through the differential emission measure obtained from multi-wavelength EUV images of the Atmospheric Imaging Assembly on board Solar Dynamics Observatory (SDO).Through comparing the synthetic radio images at 6 GHz with those observed by the Siberian Radioheliograph,we find that the predicted radio flux is qualitatively consistent with the observed value,confirming thermal origin of the coronal radio emission during non-flaring times.The results further show that the predicted radio flux is closer to the observations in the case that includes the contribution of plasma with temperatures above 3 MK than in the case of only involving low temperature plasma,as was usually done in the pre-SDO era.We also discuss applications of the method and uncertainties of the results.