Human eyes can be sensitive down to 380nm, the UV range goes up to 400nm. Birds and insects can see this. We can see this, using UV filters such as shown in the article. I get that it's fun to be a pedant sometimes, but come on.
replyI did not state that humans cannot see corona.
replyNor is the paper is about humans seeing corona.
It is about detecting UV photons using specialized equipment.