Optical observing puts the scientist at the mercy of the weather conditions. Clouds, snow or rain, and even celestial objects such as the moon can interfere with viewing the aurora. We consider these features, while beautiful, to contribute to "obstructed" conditions.
Clouds and light pollution from a nearby city
Cloud coverage and the Moon shining on the left side
Snow, diffuse clouds and the Moon shining on the bottom right
Clouds and light pollution from a nearby city
Cloud coverage and the Moon shining on the left side
Snow, diffuse clouds and the Moon shining on the bottom right
