A Study on Non-coplanar Baseline Effects for Mingantu Spectral Radioheliograph. (1st October 2022)

• Record Type: Journal Article
• Authors: Yang, Qiu-Ping; Wang, Feng; Deng, Hui; Mei, Ying; Wang, Wei
• Is Part Of: Research in astronomy and astrophysics. Volume 22:Number 10(2022)
• Publication Date: 2022-10-01
• Subjects: instrumentation: interferometers -- Sun: radio radiation -- methods: data analysis; Astronomy -- Periodicals; Astrophysics -- Periodicals; 520.5
• DOI: 10.1088/1674-4527/ac8b5d
• Languages: English
• ISSNs: 1674-4527

Abstract

Abstract: 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.