Kavli Affiliate: Feng Wang
| First 5 Authors: Qiu-ping Yang, Feng Wang, Hui Deng, Ying Mei, Wei Wang
| Summary:
As a dedicated solar radioheliograph, the MingantU SpEctral RadioHeliograph
(MUSER) has a maximum baseline of more than 3000 meters 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.
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