[Propagation+Space Weather] Did you know? Space Weather/Propagation Educational Tidbit

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Did you know? Here's a space weather and radio propagation educational tidbit -- from http://nw7us.us/swc -- at 14:00 UTC on 2015-03-19:

What is the ionosphere? The ionosphere (the scientific term, 'ionosphere', is never used as a proper noun, so don't capitalize it) is the region of Earth's upper atmosphere. It lies between about 50 km and several Earth radii, hundreds of kilometers out. For radio work, the ionosphere is defined as the region between abt 50 km and 1000 km.

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