HFU HF Underground
General Category => General Radio Discussion => Topic started by: ChrisSmolinski on May 10, 2016, 2314 UTC
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They appear at dawn at an altitude of about 150 kilometers: odd radar blips that descend from the sky over the course of the morning, growing stronger as they drop 20 km as the day progresses. Then they rise back to 150 km during the afternoon, before disappearing at sunset. These radar echoes have puzzled researchers for decades. And now a new study may finally have an explanation for what causes them.
http://www.sciencemag.org/news/2016/05/mysterious-radar-echoes-sky-explained