IRIS will pay special attention to a thin layer of the sun's atmosphere called the "interface region" where most of the sun’s ultraviolet emission is generated. Researchers are keen to study this layer because it is probably the energy source for the sun's mysteriously-hot outer corona.
"IRIS will show the solar chromosphere in more detail than has ever been observed before," says Adrian Daw, deputy project scientist. "My opinion is that we are bound to see something we didn't expect to see." Stay tuned! www.spaceweather.com