Statistical properties of radio flux densities of solar flares

作     者：Lu Wang Si-Ming Liu Zong-Jun Ning Lu Wang;Si-Ming Liu;Zong-Jun Ning

作者机构：Purple Mountain ObservatoryNanjing 210000China Key Laboratory of Dark Matter and Space AstronomyNanjing 210000China University of Science and Technology of ChinaHeifei 100049China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2020年第20卷第11期

页      面：239-251页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：the International Partnership Program of Chinese Academy of Sciences(No.114332KYSB20170008) the International Cooperation and Exchange Project of the National Natural Science Foundation of China(No.11761131007) 

主　　题：methods data analysis Sun flares Sun radio radiation 

摘      要：Short timescale flux variations are closely related to the energy release process of magnetic reconnection during solar *** light curves at 1,2,3.75,9.4,and 17 GHz of 209 flares observed by the Nobeyama Radio Polarimeter from 2000 to 2010 are analyzed with a running smooth *** find that the impulsive component(with a variation timescale shorter than 1 s)of 1 GHz emission of most flares peaks at a few tens of solar flux unit and lasts for about 1 minute and the impulsive component of 2 GHz emission lasts a shorter period and peaks at a lower flux level,while at the three high frequency channels the occurrence frequency of flares increases with the decrease of the flux density up to the noise level of the corresponding ***,the gradual components of these emissions have similar duration and peak flux density *** also derive the power spectrum on different timescales and a normalized wavelet analysis is used to confirm features on short *** a time resolution of 0.1 s,more than^60%of these radio light curves show significant flux variation on 1 s or shorter time *** fraction increases with the decrease of frequency and reaches^100%at 1 GHz,implying that short timescale processes are universal in solar *** also study the correlation between the impulsive radio flux densities and soft X-ray fluxes obtained with the GOES satellites and find that more than 65%of the flares with an impulsive component have their impulsive radio emission reach a peak value ahead of the soft X-ray fluxes and this fraction increases with the radio frequency.