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• n  the outer region of the Earth's atmosphere; contains a high concentration of free electrons

• The heights of the ionosphere shells change from hour to hour, from day to day.
• Pentagon warriors enlist the ionosphere against smugglers .
• Their normal line of travel is to the ionosphere (which begins 30 miles up), and then back to the earth by reflection.

News & Articles

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• NASA Using Sounding Rockets To Study Our Ionosphere
  Brett Smith for redOrbit.com - Your Universe Online Way up in the Earth’s atmosphere is a layer of charged particles called the ionosphere , which plays a crucial role in the transmission of radio and other signals. Through a mission called Dynamo, NASA scientists are planning to study the currents that pass through this charged section of the atmosphere found between 30 and 600 miles above ...
  June 21, 2013 - redOrbit
• The Space Alphabet: A Trippy, Orchestral Tribute to Celestial ... Stuff
  This kids' album from 1972 could teach you a thing or two about water vapor, the ionosphere, and Uranus.        
  June 21, 2013 - The Atlantic
• Sounding rocket to observe currents in atmosphere
  ( NASA/Goddard Space Flight Center ) Scientists are gearing up to launch a sounding rocket from NASA's Wallops Flight Facility, Wallops Island, Va. for a five-minute trip to study a global, electrical current called the dynamo sweeping through the ionosphere. The sounding rocket is also called Dynamo. The window for launch is June 24 to July 8, 2013 (excepting June 26-27).
  June 20, 2013 - EurekAlert!

Quotes

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• Scott Fybush in The Daily News Online
  Fybush explains: "It's a phenomenon that happens primarily in the summer months, when a layer of the ionosphere becomes ionized in such a way that it functions as a mirror at certain frequencies, including at times the FM radio dial."