A new view of the solar atmosphere: daily full-disk multifrequency radio images from EOVSA

A new pipeline processing system is producing unprecedented daily full-disk images of the Sun from the Expanded Owens Valley Solar Array (EOVSA) in 6 frequency bands from 1-14 GHz. The images are produced by fitting a disk model to the measured visibilities and using the disk for self-calibration of the radio imaging data, resulting in images that faithfully show even the weakest of features in the solar atmosphere, including clear limb brightening, coronal holes, weak plage regions, filaments, and prominences. The multi-frequency data can be used to investigate the physical properties of these features of the solar corona, transition region, and upper chromosphere, but the data are so new that the interpretation is still in progress. We highlight some initial results on the frequency dependence of equatorial limb brightening and polar coronal hole darkening.