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News Light Pollution

Clouds and Aurora in a Natural Setting

Dark clouds with the aurora borealis lighting up the sky in gree, purple and orange over Glacier National Park in Montana, U.S.
Photo by Ray Stinson (CC).

By Guest Author Chris Kyba

Ray Stinson recently shared these beautiful images of aurora and clouds with me. They were taken in Glacier National Park in Montana, U.S. The orange glow at the horizon in some of the photos is skyglow from Browning, Montana, over 50 kilometers away.

A few years ago, Ray took some photos of dark clouds passing over the Milky Way for me to use in this article that looks at the effects of clouds on skyglow. For nearly all of Earth’s history, clouds made the night darker, just like they do in the day. It’s only recently that this has been reversed, and we have now observed overcast skies over 2,000 times brighter than the natural star filled sky. We don’t yet have models that can tell us where clouds make the sky brighter, but we do know that the affected area is enormous.

Nocturnal animals specialized to live under nighttime light levels. Over much of the Earth’s land surface, the night no longer occurs, there is only daytime and twilight. Unfortunately, there has been almost no research into whether and what this change has done to ecosystems.

IMG_2825rs (1)
Photo by Ray Stinson (CC)
Photo by Ray Stinson (CC)
IMG_3116rs-t persied meteor
Photo by Ray Stinson (CC)

Christopher Kyba is an IDA board member and studies the ecological impact of artificial light in the nighttime environment at the German Research Center for Geoscience in Potsdam. His work mainly focuses on quantifying the flux of light emitted upward by cities (using aerial or satellite observations), and the light that is returned back to Earth as skyglow. One of his current research interests is in examining observations made by citizen scientists in order to understand how skyglow is changing with the introduction of LED lamps.

This post originally appeared on the Loss of the Night citizen science blog.