Bright discrete, and dim diffuse aurora

What Is Discrete Aurora? (It’s Not Discreet!)

While “discreet” means something that is a little bit secretive or unobtrusive, “discrete” auroras are distinct, bright, narrow bands—most commonly, photos of auroras are of this type. They typically have a definite lower border and can stretch high into the sky, like curtains, when viewed from the side. From below they are very narrow. They[…]