Tackling the Unique Challenges of Low-frequency Solar Polarimetry with the Square Kilometre Array Low Precursor: The Algorithm

Abstract Coronal magnetic fields are well known to be one of the crucial parameters defining coronal physics and space weather. However, measuring global remains challenging. The polarization properties radio emissions sensitive fields. While they can prove useful probes heliospheric fields, their usage has been limited by technical algorithmic challenges. We present a robust algorithm for precise calibration imaging low-radio frequency solar observations demonstrate it on data from Murchison Widefield Array, Square Kilometre Array (SKA) precursor. This is based Measurement Equation framework, which forms basis all modern interferometric imaging. It delivers high-dynamic-range high-fidelity full-Stokes images with instrumental leakages <1%, par general astronomical imaging, represents state art. Opening up this rewarding, yet unexplored, phase will enable multiple novel science investigations offer considerable discovery potential. Examples include detection low-level circular thermal emission estimate large-scale quiescent fields; faint gyrosynchrotron mass ejections estimation plasma parameters; first-ever linear at these frequencies. method developed SKA in mind new era spectropolarimetric snapshot low