Photos by Barry Wallace
Contrails over Aurora
With clearer, sunnier skies over Aurora in April, contrails appear clearly in the the skies thousands of feet above regular jet aircraft travel. The contrails are created by American Airforce B52s which, for decades, have constantly flown hundreds of miles back and forth across, up and down North America, including Canada (see Norad). In this day and age, jet aircraft and transport planes, other than air force planes, also create high-altitude contrails.
Contrails, short for "condensation trails", are linear, artificial high-altitude clouds composed of ice crystals formed by aircraft exhaust (water vapour) are exhaust particles (soot) freezing in extremely cold air. They typically appear at altitudes of 7,500 to 12,000 metres (25,000 to 40,000 ft.
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Barry Wallace
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