Volcanic sunsets.

Above: Sunset in Princeton, Indiana, as photographed by Misty Lundberg.

The eruptions of Kasatochi and two other volcanoes in the Aleutian Islands of Alaska are creating red sunsets all across the United States.

Says atmospheric optics expert Les Cowley: "Volcanic eruptions hurl gigantic clouds of fine dust and sulfur dioxide into the stratosphere where high winds spread them around the globe. Sulfur dioxide forms aerosols; these and the dust scatter sunlight to give us red skies, twilight rays and Bishop’s rings. I’m getting many reports of unusual sunsets – look up!"

Check out the entire article (and more photos) at SpaceWeather.com.