Multi-scale clean deconvolution for solar radio imaging with Mingantu Ultrawide Spectral Radioheliograph (MUSER)

The MUSER is a solar-dedicated radio interferometric array, which will simultaneously make high time, space and frequency resolution images of the Sun. Solar radio imaging is dependent upon deconvolution algorithm to counteract the sparse sampling of the Fourier plane. Recently, the deconvolution method used in MUSER imaging is Hogbom CLEAN algorithm. This algorithm works extremely well for collections of point sources; however, for extended objects, such as the solar disk, it should be improved by adopting the multi-scale approach. In this work we employ and improve the Cornwell Multi-scale CLEAN (2008) as the deconvolution method in MUSER solar radio imaging. Experimental results demonstrate the effectiveness and efficiency of the Multi-scale CLEAN in MUSER solar radio imaging.