This image has been composed from different combinations of polarized images during totality, to bring out the details of the structures in the corona.
The images were taken by the ESA-CESAR team observing the eclipse from ESO’s La Silla Observatory in Chile, South America on 2 July 2019.
Here’s a link that explains it, but basically it is a combination of images of different wavelengths and false color for the non-visible spectra images