Space Weather News for May 22, 2019
http://spaceweather.com
https://www.spaceweatheralerts.com
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.
Sign up for Space Weather Alerts and get an instant text message when geomagnetic storms begin.
|
|
|
|
