A Study on Non-coplanar Baseline Effects for Mingantu Spectral Radioheliograph  

作　　者：Qiu-Ping Yang Feng Wang Hui Deng Ying Mei Wei Wang 

机构地区：[1]Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China [2]Faculty of Information Engineering and Automation,Kunming University of Science and Technology,Kunming 650500,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Center of Astrophysics,Guangzhou University,Guangzhou 510006,China [5]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

出　　处：《Research in Astronomy and Astrophysics》2022年第10期111-118,共8页天文和天体物理学研究（英文版）

基　　金：supported by the National SKA Program of China(2020SKA0110300);the Joint Research Fund in Astronomy(U1831204 and U1931141);the National Natural Science Foundation of China(NSFC);the Chinese Academy of Sciences(CAS);the Funds for International Cooperation and Exchange of the NSFC(11961141001);the NSFC(Grant No.11903009)。

摘　　要：As a dedicated solar radioheliograph,the MingantU SpEctral RadioHeliograph(MUSER)has a maximum baseline of more than 3000 m and a frequency range of 400 MHz–15 GHz.According to the classical radio interferometry theory,the non-coplanar baseline effect(i.e.,w-term effect)would be considered and calibrated for such a radio instrument.However,little previous literature made the qualitative or quantitative analyses on w-term effects of solar radioheliograph in-depth.This study proposes a complete quantitative analysis of w-term effects for the MUSER.After a brief introduction of the MUSER,we systematically investigate the baseline variations over a year and analyze the corresponding variations of w-term.We further studied the effects of the w-term in the imaging for the specified extended source,i.e.,the Sun.We discussed the possible effects of the w-term,such as image distortion and so on.The simulated results show that the w-term is an essential and unavoidable issue for solar radio imaging with high spatial resolution.

关 键 词：INSTRUMENTATION interferometers-Sun radio radiation-methods data analysis 

分 类 号：P111.41[天文地球—天文学]