Dec. 17, 2023: (Spaceweather.com) A cold wave just swept through the Arctic stratosphere. Really cold. We know because on Dec. 17th these colorful clouds appeared over Sweden: Above: A “PSC selfie” by Lights over Lapland driver Dimitrios Roukounakis “It’s that magical time of year again,” says Chad Blakley, owner of the aurora tour guide service … Continue reading An Outbreak of Polar Stratospheric Clouds