Around the Arctic Circle, VHF radio signals are starting to echo from Earth's upper atmosphere--a sign that noctilucent clouds are about to appear.
Space Weather News for May 22, 2019
http://spaceweather.com
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POLAR MESOSPHERIC SUMMER ECHOES: Around the Arctic Circle, VHF radio signals are starting to echo from Earth's upper atmosphere--a phenomenon called "Polar Mesospheric Summer Echoes." This is a sign that ice is crystallizing around specks of meteor debris, forming the first noctilucent clouds of summer. Soon, their electric-blue tendrils may be visible to the naked eye in the night skies of northern countries. Visit Spaceweather.com for observing tips and more information about PMSEs.
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