A Coronal Flash A prominence and its interaction with the corona are captured in two different AIA extreme ultraviolet wavebands: 193 Angstrom (above) and 304 Angstrom (below). The 304 Angstrom material is cooler (around 50,000 Kelvin) than the plasma seen in the 193 Angstrom images (around 1.5 million Kelvin). As the cool prominence plasma streams onto the disk of the Sun, it deposits energy and a "flash" is visible in both wavebands.