The northern lights painted the night sky green across the northern parts of the U.S. and Canada, and were even seen as a faint pink as far south as New Mexico.
The lights appear increasingly red in color further toward the equator, because observers can see only the upper parts of the auroras.
"That red color is usually also rather faint, since you do not have that many of the oxygen atoms around at such high altitudes," Daniel Brownlast month. He is an associate professor in astronomy and science communication at Nottingham Trent University in the U.K."But, if you have a strong enough activity like we are getting now, there are enough exciting particles in the coronal mass ejections to interact with more oxygen and make the red brighter."WOW.
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