Correction of the temperature effect in calibration of a solar radio telescope  

作　　者：Li-Hong Geng Cheng-Ming Tan Yi-Hua Yan Bao-Lin Tan Dong-Hao Liu Jin-Ping Dun 

机构地区：[1]CAS key Laboratory of Solar Activity,National Astronomical Observatories of Chinese Academy of Sciences,Beijing 100101,China [2]School of Astronomy and Space Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]Key Laboratory of Space Weather,National Center for Space Weather,China Meteorological Administration,Beijing 100081,China

出　　处：《Research in Astronomy and Astrophysics》2021年第6期349-358,共10页天文和天体物理学研究（英文版）

基　　金：supported by NSFC(Grant Nos.11433006,11661161015,11790301,11790305,11973057,11773043,11941003 and 2018YFA0404602);the MOST grant(2014FY120300)。

摘　　要：This work analyzes the annual fluctuation of the observation data of the Mingantu Solar radio Telescope(MST)in S,C and X bands.It is found that the data vary with local air temperature as the logarithmic attenuation of equipment increases with temperature and frequency.A simplified and effective calibration method is proposed,which is used to calibrate the MST data in 2018-2020,while the correction coefficients are calculated from data in 2018-2019.For S,C and X bands,the root mean square errors of one polarization are 2.7,5.7 and 20 sfu,and the relative errors are 4%,6%and 8%respectively.The calibration of MUSER and SBRS spectra is also performed.The relative errors of MUSER at 1700 MHz,SBRS at 2800 MHz,3050 MHz and 3350 MHz are 8%,8%,11%and 10%respectively.We found that several factors may affect the calibration accuracy,especially at X-band.The method is expected to work for other radio telescopes with similar design.

关 键 词：INSTRUMENTATION polarimeters methods data analysis methods:observational 

分 类 号：P111.2[天文地球—天文学]